Grizzly G0768 User Manual To The Bf2821a0 7219 4865 986a 8e2204280c84

User Manual: Grizzly G0768 to the manual

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MODEL G0768/G0769
8" X 16" VARIABLE-SPEED
LATHE & LATHE/MILL
OWNER'S MANUAL
(For models manufactured since 8/15)
COPYRIGHT © AUGUST, 2014 BY GRIZZLY INDUSTRIAL, INC. REVISED AUGUST, 2015 (MN)
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
# BLTSDM16348 PRINTED IN CHINA V2.08.15
Model G0768 Model G0769
This manual provides critical safety instructions on the proper setup,
operation, maintenance, and service of this machine/tool. Save this
document, refer to it often, and use it to instruct other operators.
Failure to read, understand and follow the instructions in this manual
may result in fire or serious personal injury—including amputation,
electrocution, or death.
The owner of this machine/tool is solely responsible for its safe use.
This responsibility includes but is not limited to proper installation in
a safe environment, personnel training and usage authorization,
proper inspection and maintenance, manual availability and compre-
hension, application of safety devices, cutting/sanding/grinding tool
integrity, and the usage of personal protective equipment.
The manufacturer will not be held liable for injury or property damage
from negligence, improper training, machine modifications or misuse.
Some dust created by power sanding, sawing, grinding, drilling, and
other construction activities contains chemicals known to the State
of California to cause cancer, birth defects or other reproductive
harm. Some examples of these chemicals are:
• Lead from lead-based paints.
• Crystalline silica from bricks, cement and other masonry products.
• Arsenic and chromium from chemically-treated lumber.
Your risk from these exposures varies, depending on how often you
do this type of work. To reduce your exposure to these chemicals:
Work in a well ventilated area, and work with approved safety equip-
ment, such as those dust masks that are specially designed to filter
out microscopic particles.
Table of Contents
INTRODUCTION ............................................... 3
Machine Description ...................................... 3
Contact Info.................................................... 3
Manual Accuracy ........................................... 3
Identification (G0768)..................................... 4
Identification (G0769)..................................... 5
Controls & Components ................................. 6
Headstock ................................................................... 6
Carriage ....................................................................... 6
Tailstock ...................................................................... 7
End Gears, Pulleys, V-Belts ........................................ 7
Milling Headstock (G0769 Only) ................................. 8
G0768 Data Sheet ......................................... 9
G0769 Data Sheet ....................................... 11
SECTION 1: SAFETY ..................................... 13
Safety Instructions for Machinery ................ 13
Additional Safety for Metal Lathes ............... 15
Additional Safety for Mills/Drills ................... 16
Additional Lathe Chuck Safety..................... 17
SECTION 2: POWER SUPPLY ...................... 18
Availability .................................................................18
Full-Load Current Rating ...........................................18
110V Circuit Requirements .......................................18
Grounding & Plug Requirements ..............................19
Extension Cords ........................................................19
SECTION 3: SETUP ....................................... 20
Setup Overview............................................ 20
Unpacking .................................................... 20
Needed for Setup ......................................... 20
Inventory ...................................................... 21
Cleanup ........................................................ 22
Site Considerations ...................................... 23
Lifting & Placing ........................................... 24
Mounting ...................................................... 25
Leveling ........................................................ 26
Assembly ..................................................... 26
Test Run ...................................................... 27
Spindle Break-In .......................................... 29
Lathe Spindle Break-In ..............................................29
Mill Spindle Break-In (G0769 Only) ..........................29
Recommended Adjustments ........................ 30
SECTION 4: LATHE OPERATIONS .............. 31
Operation Overview ..................................... 31
Chuck & Faceplate Mounting....................... 32
Installation & Removal Device ..................... 32
Chuck Installation......................................... 32
Scroll Chuck Clamping ................................ 33
Changing Jaw Set ........................................ 34
4-Jaw Chuck ................................................ 35
Faceplate ..................................................... 36
Tailstock ....................................................... 37
Tailstock Quill Specs .................................................37
Positioning Tailstock .................................................37
Using Quill .................................................................37
Installing Tooling .......................................................38
Removing Tooling .....................................................38
Offsetting Tailstock ....................................................38
Aligning Tailstock to Spindle Centerline ....................39
Centers ........................................................ 41
Dead Centers ............................................................41
Mounting Dead Center in Spindle .............................41
Removing Center from Spindle .................................41
Mounting Center in Tailstock ....................................42
Removing Center from Tailstock ...............................42
Mounting Workpiece Between Centers .....................42
Steady Rest ................................................. 43
Follow Rest .................................................. 43
Compound Rest ........................................... 44
Four-Way Tool Post ..................................... 44
Installing Tool ............................................................44
Aligning Cutting Tool with Spindle Centerline ...........45
Manual Feed ................................................ 46
Carriage Handwheel .................................................46
Cross Slide Handwheel .............................................46
Compound Rest Handwheel .....................................46
Spindle Speed.............................................. 47
Determining Spindle Speed ......................................47
Setting Spindle Speed Range ...................................47
Setting Spindle Direction & Speed ............................47
Configuration Example ..............................................48
Understanding Gear Charts ......................... 49
Feed & Thread Charts Label .....................................49
How to Read the Feed Chart ....................................50
How to Read the Thread Charts ...............................51
End Gears .................................................... 52
Power Feed Configuration ........................................52
Primary Threading Configuration ..............................52
Secondary Threading Configuration .........................52
Configuring End Gears ..............................................53
Power Feed.................................................. 56
Power Feed Controls ................................................56
Setting Power Feed Rate ..........................................57
Threading ..................................................... 58
Headstock Threading Controls ..................................58
Apron Threading Controls .........................................59
Thread Dial ................................................................59
Thread Dial Chart ......................................................59
SECTION 5: MILL OPERATIONS .................. 60
Operation Overview ..................................... 60
Removing Compound Rest .......................... 61
Removing Compound Rest ......................................61
Re-installing Compound Rest ..................................61
Headstock Movement .................................. 62
Raising/Lowering Headstock .....................................62
Tilting Headstock .......................................................62
Table Travel ................................................. 63
Carriage Handwheel (X-Axis) ....................................63
Cross Slide Handwheel (Y-Axis) ...............................63
Using Spindle Downfeed Controls ............... 64
Coarse Downfeed .....................................................64
Fine Downfeed ..........................................................64
Engaging Fine Downfeed Controls ...........................64
Installing/Removing Tooling ......................... 65
Installing Tooling .......................................................65
Removing Tooling .....................................................66
Spindle Speed.............................................. 67
Determining Spindle Speed ......................................67
Setting Spindle Speed ...............................................67
SECTION 6: ACCESSORIES ......................... 68
SECTION 7: MAINTENANCE ......................... 71
Schedule ...................................................... 71
Ongoing .....................................................................71
Daily, Before Operations ...........................................71
Daily, After Operations ..............................................71
Every 90 Hours of Operation ....................................71
Every 120 Hours of Operation ..................................71
Annually .....................................................................71
Cleaning/Protecting ...................................... 71
Lubrication ................................................... 72
Lubrication Frequency ...............................................72
Ball Oilers ..................................................................72
Leadscrew & Carriage Rack .....................................73
Bedways ....................................................................73
Feed Gearbox ...........................................................73
Cross Slide & Compound Slide .................................73
End Gears .................................................................74
Column Ways (G0769) ..............................................75
Quill Outside Surface ................................................75
Quill Rack .................................................................75
Z-Axis Leadscrew (G0769) .......................................76
Headstock Gears (G0769) ........................................76
Machine Storage .......................................... 77
Preparing Machine for Storage .................................77
Bringing Machine Out of Storage ..............................77
SECTION 8: SERVICE ................................... 78
Troubleshooting ........................................... 78
Motor & Electrical ......................................................78
Lathe Operation ........................................................79
Mill Operation ............................................................80
Tensioning & Replacing V-Belts .................. 81
Adjusting Backlash....................................... 82
Cross Slide ................................................................82
Adjusting Leadscrew End Play .................... 82
Adjusting Gibs .............................................. 83
Adjusting Cross Slide and Compound Slide Gibs .....83
Adjusting Z-Axis Way Gib .........................................84
Adjusting Half Nut ........................................ 84
Replacing Leadscrew Shear Pin.................. 85
Replacing Fuse ............................................ 85
Replacing Brushes ....................................... 86
Replacing Lathe Motor Brushes ................................86
Replacing Mill Motor Brushes (G0769) .....................87
SECTION 9: WIRING ...................................... 88
Wiring Safety Instructions ............................ 88
G0768 Wiring Overview ............................... 89
G0768 Wiring ............................................... 90
G0768 Wiring Photos ................................... 91
G0769 Wiring Overview ............................... 92
G0769 Wiring ............................................... 93
G0769 Wiring Photos ................................... 94
SECTION 10: PARTS ..................................... 95
Headstock .................................................... 95
Carriage Components & Accessories .......... 96
Apron ........................................................... 99
Gearbox ..................................................... 100
Bed & End Gears ....................................... 101
Tailstock ..................................................... 102
G0769 Mill Column .................................... 103
G0769 Mill Headstock ................................ 104
G0768 Labels & Cosmetics ....................... 106
G0769 Labels & Cosmetics ....................... 107
G0768 Electrical Component Diagram ...... 108
G0769 Electrical Component Diagram ...... 109
SECTION 11: APPENDIX ............................. 110
Threading & Feeding Chart ....................... 110
Thread Dial Chart ...................................... 110
WARRANTY & RETURNS ........................... 113
Model G0768/G0769 (Mfd. Since 8/15) -3-
INTRODUCTION
Machine Description
We are proud to provide a high-quality owner’s
manual with your new machine!
We
made every effort to be exact with the
instruc-
tions, specifications, drawings, and photographs
in this manual. Sometimes we make mistakes, but
our policy of continuous improvement also means
that
sometimes the machine
you receive is
slightly different than shown in the manual
.
If you find this to be the case, and the difference
between the manual and machine leaves you
confused or unsure about something
,
check our
website for an updated version. W
e post
current
manuals and
manual updates for free
on our web-
site at
www.grizzly.com.
Alternatively, you can call our Technical Support
for help. Before calling, make sure you write down
the
Manufacture Date and Serial Number
from
the machine ID label (see below). This information
is required for us to provide proper tech support,
and it helps us determine if updated documenta-
tion is available for your machine.
Manufacture Date
Serial Number
Manual Accuracy
We stand behind our machines! If you have ques-
tions or need help, contact us with the information
below. Before contacting, make sure you get the
serial number
and manufacture date from the
machine ID label. This will help us help you faster.
Grizzly Technical Support
1203 Lycoming Mall Circle
Muncy, PA 17756
Phone: (570) 546-9663
Email: techsupport@grizzly.com
We want your feedback on this manual. What did
you like about it? Where could it be improved?
Please take a few minutes to give us feedback.
Grizzly Documentation Manager
P.O. Box 2069
Bellingham, WA 98227-2069
Email: manuals@grizzly.com
Contact Info
The Model G0768 and G0769 share lathe fea-
tures such as a 600 Watt (3⁄4 HP) 110V DC motor,
variable-speed controls with digital RPM display,
high/low spindle speed ranges, 4" 3-jaw and
4-jaw chucks, a convenient quick-lock tailstock, a
4-way turret toolpost, steady and follow rests, and
reverse feed for cutting left-hand threads.
The Model G0769 additionally features a 600
Watt (3⁄4 HP) milling headstock motor, 45° left/
right head tilt, coarse and fine downfeed con-
trols, Z-axis dovetailed ways for maximum pre-
cision, and a 1⁄2" drill chuck. The cross slide
table features T-slots for mounting a vise. The
lathe/mill selector switch also makes chang-
ing between lathe and milling modes easy.
Both machines can be mounted on a sturdy work-
bench, or the optional Model T26599 stand—with
cabinet space for storing tooling and accessories.
-4- Model G0768/G0769 (Mfd. Since 6/14)
Identification (G0768)
Become familiar with the names and locations of the controls and features shown below to better understand
the instructions in this manual.
To reduce your risk of
serious injury, read this
entire manual BEFORE
using machine.
Figure 1. Model G0768 identification.
Spindle Direction
Switch
On/Off Switch w/
Emergency Stop
Button Steady
Rest
Feed
Direction
Dial
Spindle
Speed Dial
Thread
Dial
Compound Rest
Handwheel
Tailstock
4-Way
Tool Post
3-Jaw
Chuck
Carriage
Lock
Spindle
Speed
RPM
Display
Cross Slide
Handwheel Half Nut
Lever
Carriage
Handwheel
Model G0768/G0769 (Mfd. Since 6/14) -5-
Identification (G0769)
Become familiar with the names and locations of the controls and features shown below to better understand
the instructions in this manual.
Figure 2. Model G0769 identification.
Spindle Direction
Switch
On/Off Switch w/
Emergency Stop
Button
Lathe/Mill Selector
Switch
Vertical Travel
Lock Levers
Steady
Rest
Feed
Direction
Dial
Spindle
Speed Dial
Carriage
Handwheel
Thread
Dial
Compound Rest
Handwheel
Coarse
Downfeed
Handle
Tailstock
Downfeed
Selector
Knob
4-Way
Tool Post
3-Jaw
Chuck
Spindle
Lock
Carriage
Lock
Vertical Travel
Handwheel
Spindle
Speed
RPM
Display
Cross Slide
Handwheel
Half Nut
Lever
Fine Downfeed
Handwheel
-6- Model G0768/G0769 (Mfd. Since 8/15)
Controls &
Components
Refer to Figures 3–8 and the following descrip-
tions to become familiar with the basic controls of
this machine.
To reduce your risk of
serious injury, read this
entire manual BEFORE
using machine.
Headstock
F. Lathe/Mill Selector Switch (G0769 Only):
Used to select between lathe mode (1), or
mill mode (2).
A. Feed Direction Dial: Used to select direction
of leadscrew rotation when spindle is rotating
in downward (F) direction. Used to switch
between right or left thread cutting.
B. Spindle Speed Dial: Controls spindle speed.
C. Spindle Speed RPM Display: Shows spin-
dle speed.
D. Spindle Direction Switch: Selects spindle
rotation direction.
Figure 3. Control panel.
EF
B
C
D
A
Carriage
G. Carriage Handwheel: Manually moves car-
riage left or right along bedway.
H. Cross Slide Handwheel: Moves cross slide
toward and away from workpiece.
I. 4-Way Tool Post: Holds up to four cutting
tools at once that can be individually indexed
to workpiece and quickly moved into position
when needed.
J. Cross Slide Table (G0769 Only): Supports
workpieces for milling/drilling operations.
Includes T-slots for mounting milling vises or
other fixtures.
K. Compound Rest Handwheel: Moves tool
toward and away from workpiece at preset
compound angle.
L. Thread Dial: Indicates when to engage the
half nut during threading operations.
M. Half Nut Lever: Engages/disengages half
nut for power feeding and threading opera-
tions.
Figure 4. Carriage controls.
IK
L
M
G
H
J
E. ON/OFF Switch w/Emergency Stop Button:
When pressed, cuts power to motor and con-
trol panel. To reset, press front tab, lift switch
cover, and press green ON button. Cover
must be unlatched for machine to run.
Model G0768/G0769 (Mfd. Since 8/15) -7-
Tailstock End Gears, Pulleys, V-Belts
U. End Gears: The configuration of the end
gears controls the leadscrew speed for power
feeding, and inch and metric threading.
V. V-Belts: Transfer power from motor to idler
and spindle pulleys. The position of the top
V-belt on idler and spindle pulleys controls
spindle speed.
Figure 5. Tailstock controls.
O
N. Tailstock Quill: Uses an MT#2 taper to hold
centers or other tooling, features a scale on
top.
O. Tailstock Quill Lock Lever: Secures quill
position.
P. Tailstock Lock Lever: Secures tailstock in
position along bedway.
Q. Graduated Scale: Indicates quill movement
in increments of 0.001", with one full revolu-
tion equaling 0.04" of quill travel.
R. Quill Handwheel: Moves quill toward or
away from spindle.
S. Offset Scale: Indicates relative distance of
tailstock offset from spindle centerline.
T. Tailstock Offset Screws: Adjusts tailstock
offset left or right from spindle centerline (1 of
2).
S
N
PQ
R
T
Figure 6. End gears, V-belts, and pulleys.
U
V
Serious personal injury could occur if
you connect the machine to power before
completing the setup process. DO NOT
connect power until instructed to do so later
in this manual.
-8- Model G0768/G0769 (Mfd. Since 8/15)
Milling Headstock (G0769 Only)
Figure 8. Left side milling headstock controls.
X. Fine Downfeed Handwheel: Provides fine
control over vertical spindle travel to provide
Z-axis control when milling.
Y. Vertical Travel Lock Levers: Locks position
of headstock to column.
Z. Downfeed Selector Knob: Selects between
fine and coarse downfeed modes. Tighten to
engage fine downfeed. Loosen to use coarse
downfeed.
AA. Coarse Downfeed Handles: Moves spindle
down quickly when rotated and automatic
spring return brings spindle back up to top
when you release downward pressure on
handles. Typically used for drilling holes or
checking spindle positioning during setups.
Figure 7. Right side milling headstock controls.
X
Y
Z
AB
AC
AD
AB. Vertical Handwheel: Raises and lowers
headstock for Z-axis control over spindle
positioning during setups.
AC. High/Low Gearbox Knob: Selects low range
"L" or high range "H" for spindle speed.
AD. Quill Lock Lever: Locks vertical position
of quill (or Z-axis) when tightened. Typically
used in conjunction with spindle downfeed
controls when milling.
AA
Model G0768/G0769 (Mfd. Since 8/15) -9-
The information contained herein is deemed accurate as of 9/2/2015 and represents our most recent product specifications.
Due to our ongoing improvement efforts, this information may not accurately describe items previously purchased. PAGE 1 OF 3
Model G0768
MACHINE DATA
SHEET
Customer Service #: (570) 546-9663 · To Order Call: (800) 523-4777 · Fax #: (800) 438-5901
MODEL G0768 8" X 16" VARIABLE‐SPEED LATHE
Product Dimensions:
Weight.............................................................................................................................................................. 144 lbs.
Width (side-to-side) x Depth (front-to-back) x Height........................................................................... 36 x 16 x 14 in.
Footprint (Length x Width)............................................................................................................... 31-1/2 x 10-1/2 in.
Shipping Dimensions:
Type.......................................................................................................................................................... Wood Crate
Content........................................................................................................................................................... Machine
Weight.............................................................................................................................................................. 166 lbs.
Length x Width x Height....................................................................................................................... 36 x 19 x 17 in.
Must Ship Upright................................................................................................................................................... Yes
Electrical:
Power Requirement........................................................................................................... 110V, Single-Phase, 60 Hz
Full-Load Current Rating........................................................................................................................................ 10A
Minimum Circuit Size.............................................................................................................................................. 15A
Connection Type....................................................................................................................................... Cord & Plug
Power Cord Included.............................................................................................................................................. Yes
Power Cord Length................................................................................................................................................. 6 ft.
Power Cord Gauge......................................................................................................................................... 16 AWG
Plug Included.......................................................................................................................................................... Yes
Included Plug Type................................................................................................................................................ 5-15
Switch Type........................................................................................... ON/OFF Push Button Switch w/Safety Cover
Motors:
Main
Type................................................................................................................................. Universal Brush-Type
Horsepower................................................................................................................................ 600W (3/4 HP)
Phase............................................................................................................................................ Single-Phase
Amps............................................................................................................................................................ 10A
Speed................................................................................................................................................ 5250 RPM
Power Transfer .................................................................................................................................. Belt Drive
Bearings..................................................................................................... Shielded & Permanently Lubricated
Main Specifications:
Operation Info
Swing Over Bed..................................................................................................................................... 8-1/4 in.
Distance Between Centers.................................................................................................................. 15-3/4 in.
Swing Over Cross Slide......................................................................................................................... 4-5/8 in.
Swing Over Saddle................................................................................................................................ 6-7/8 in.
Maximum Tool Bit Size............................................................................................................................. 1/2 in.
Compound Travel.................................................................................................................................. 2-1/8 in.
Carriage Travel.................................................................................................................................... 15-3/4 in.
Cross Slide Travel....................................................................................................................................... 3 in.
-10- Model G0768/G0769 (Mfd. Since 8/15)
The information contained herein is deemed accurate as of 9/2/2015 and represents our most recent product specifications.
Due to our ongoing improvement efforts, this information may not accurately describe items previously purchased. PAGE 2 OF 3
Model G0768
Headstock Info
Spindle Bore......................................................................................................................................... 0.787 in.
Spindle Taper............................................................................................................................................ MT#3
Number of Spindle Speeds................................................................................................................... Variable
Spindle Speeds..................................................................................................... 50 – 1000, 100 – 2000 RPM
Spindle Type........................................................................................................................ Intrinsic Back Plate
Spindle Bearings......................................................................................................................... Tapered Roller
Spindle Length....................................................................................................................................... 8-5/8 in.
Spindle Length with 3-Jaw Chuck....................................................................................................... 10-5/8 in.
Spindle Length with 4-Jaw Chuck....................................................................................................... 10-5/8 in.
Spindle Length with Faceplate.............................................................................................................. 9-3/4 in.
Tailstock Info
Tailstock Quill Travel................................................................................................................................... 2 in.
Tailstock Taper.......................................................................................................................................... MT#2
Tailstock Barrel Diameter....................................................................................................................... 0.87 in.
Threading Info
Number of Longitudinal Feeds......................................................................................................................... 3
Range of Longitudinal Feeds............................................................................. 0.0037, 0.0068, 0.0071 in./rev.
Number of Inch Threads................................................................................................................................. 15
Range of Inch Threads...................................................................................................................... 9 – 44 TPI
Number of Metric Threads.............................................................................................................................. 12
Range of Metric Threads............................................................................................................... 0.4 – 3.0 mm
Dimensions
Bed Width.................................................................................................................................................... 4 in.
Carriage Leadscrew Diameter.................................................................................................................. 5/8 in.
Leadscrew TPI......................................................................................................................................... 12 TPI
Carriage Leadscrew Length....................................................................................................................... 22 in.
Steady Rest Capacity................................................................................................................... 1/4 – 1-1/4 in.
Follow Rest Capacity.................................................................................................................... 1/4 – 1-1/4 in.
Floor to Center Height........................................................................................................................... 8-1/2 in.
Other
Optional Stand............................................................................................................................. Model T26599
Construction
Base..................................................................................................................................................... Cast Iron
Headstock............................................................................................................................................ Cast Iron
End Gears.................................................................................................................................................. Steel
Bed.......................................................................................................................... Precision-Ground Cast Iron
Paint Type/Finish...................................................................................................................................... Epoxy
Other Specifications:
Country of Origin ................................................................................................................................................ China
Warranty ........................................................................................................................................................... 1 Year
Approximate Assembly & Setup Time .............................................................................................................. 1 Hour
Serial Number Location .................................................................................................................................. ID Label
ISO 9001 Factory .................................................................................................................................................. Yes
CSA, ETL, or UL Certified/Listed ............................................................................................................................ No
Model G0768/G0769 (Mfd. Since 8/15) -11-
The information contained herein is deemed accurate as of 9/2/2015 and represents our most recent product specifications.
Due to our ongoing improvement efforts, this information may not accurately describe items previously purchased. PAGE 1 OF 3
Model G0769
MACHINE DATA
SHEET
Customer Service #: (570) 546-9663 · To Order Call: (800) 523-4777 · Fax #: (800) 438-5901
MODEL G0769 8" X 16" LATHE WITH MILLING HEAD
Product Dimensions:
Weight.............................................................................................................................................................. 234 lbs.
Width (side-to-side) x Depth (front-to-back) x Height........................................................................... 36 x 20 x 28 in.
Footprint (Length x Width)............................................................................................................... 31-1/2 x 10-1/2 in.
Shipping Dimensions:
Type.......................................................................................................................................................... Wood Crate
Content........................................................................................................................................................... Machine
Weight.............................................................................................................................................................. 287 lbs.
Length x Width x Height....................................................................................................................... 36 x 23 x 35 in.
Must Ship Upright................................................................................................................................................... Yes
Electrical:
Power Requirement........................................................................................................... 110V, Single-Phase, 60 Hz
Full-Load Current Rating........................................................................................................................................ 10A
Minimum Circuit Size.............................................................................................................................................. 15A
Connection Type....................................................................................................................................... Cord & Plug
Power Cord Included.............................................................................................................................................. Yes
Power Cord Length................................................................................................................................................. 6 ft.
Power Cord Gauge......................................................................................................................................... 16 AWG
Plug Included.......................................................................................................................................................... Yes
Included Plug Type................................................................................................................................................ 5-15
Switch Type........................................................................................... ON/OFF Push Button Switch w/Safety Cover
Motors:
Lathe Spindle
Type................................................................................................................................. Universal Brush-Type
Horsepower................................................................................................................................ 600W (3/4 HP)
Phase............................................................................................................................................ Single-Phase
Amps............................................................................................................................................................ 10A
Speed................................................................................................................................................ 5250 RPM
Power Transfer .................................................................................................................................. Belt Drive
Bearings........................................................................................................... Shielded & Permanently Sealed
Mill Spindle
Type................................................................................................................................. Universal Brush-Type
Horsepower................................................................................................................................ 600W (3/4 HP)
Phase............................................................................................................................................ Single-Phase
Amps............................................................................................................................................................ 10A
Speed................................................................................................................................................ 4800 RPM
Power Transfer ................................................................................................................................. Gear Drive
Bearings........................................................................................................... Shielded & Permanently Sealed
-12- Model G0768/G0769 (Mfd. Since 8/15)
Main Specifications:
Lathe Info
Swing Over Bed..................................................................................................................................... 8-1/4 in.
Distance Between Centers.................................................................................................................. 15-3/4 in.
Swing Over Cross Slide......................................................................................................................... 4-5/8 in.
Swing Over Saddle................................................................................................................................ 6-7/8 in.
Maximum Tool Bit Size............................................................................................................................. 1/2 in.
Compound Travel.................................................................................................................................. 2-1/8 in.
Carriage Travel.................................................................................................................................... 15-3/4 in.
Cross Slide Travel....................................................................................................................................... 3 in.
Spindle Bore............................................................................................................................ 0.787 in. (20mm)
Spindle Taper............................................................................................................................................ MT#3
Number Of Spindle Speeds................................................................................................................... Variable
Spindle Speeds..................................................................................................... 50 – 1000, 100 – 2000 RPM
Spindle Type........................................................................................................................ Intrinsic Back Plate
Tailstock Quill Travel................................................................................................................................... 2 in.
Tailstock Taper.......................................................................................................................................... MT#2
Number of Longitudinal Feeds......................................................................................................................... 3
Range of Longitudinal Feeds......................................................................... 0.0037", 0.0068", 0.0071" in./rev.
Number of Inch Threads................................................................................................................................. 15
Range of Inch Threads...................................................................................................................... 9 – 44 TPI
Number of Metric Threads.............................................................................................................................. 12
Range of Metric Threads............................................................................................................... 0.4 – 3.0 mm
Mill Info
Mill Taper................................................................................................................................................... MT#2
Mill Spindle Travel................................................................................................................................. 1-3/4 in.
Mill Swing................................................................................................................................................... 13 in.
Distance Spindle To Work Table.......................................................................................................... 9-7/8 in.
Distance Spindle To Bed..................................................................................................................... 11-1/2 in.
Distance Spindle To Center Line........................................................................................................... 7-3/4 in.
Mill Head Vertical Travel...................................................................................................................... 6-5/16 in.
Mill Head Tilt (Left/Right).................................................................................................. Left 45, Right 45 deg.
Maximum Tool Bit Size............................................................................................................................. 1/2 in.
Drilling Capacity For Steel........................................................................................................................ 1/2 in.
Drilling Capacity For Cast Iron.................................................................................................................. 1/2 in.
Table Size Length.................................................................................................................................. 7-1/4 in.
Table Size Width................................................................................................................................... 3-1/8 in.
Table Size Thickness............................................................................................................................ 1-1/8 in.
Number of T-Slots............................................................................................................................................ 2
T-Slot Size................................................................................................................................................ 1/4 in.
T-Slot Centers....................................................................................................................................... 1-1/2 in.
Drawbar Diameter..................................................................................................................................... 3/8 in.
Drawbar TPI............................................................................................................................................. 16 TPI
Drawbar Length..................................................................................................................................... 8-1/2 in.
Number of Mill Drill Speeds.............................................................................................................................. 2
Mill Speed Range...................................................................................................................... 50 – 2000 RPM
Construction
Bed....................................................................................................................................................... Cast Iron
Headstock............................................................................................................................................ Cast Iron
Body..................................................................................................................................................... Cast Iron
End Gears.................................................................................................................................................. Steel
Paint Type/Finish...................................................................................................................................... Epoxy
Model G0768/G0769 (Mfd. Since 8/15) -13-
ELECTRICAL EQUIPMENT INJURY RISKS. You
can be shocked, burned, or killed by touching live
electrical components or improperly grounded
machinery. To reduce this risk, only allow qualified
service personnel to do electrical installation or
repair work, and always disconnect power before
accessing or exposing electrical equipment.
DISCONNECT POWER FIRST.
Always discon-
nect machine from power supply BEFORE making
adjustments, changing tooling, or servicing machine.
This prevents an injury risk from unintended startup
or contact with live electrical components.
EYE PROTECTION. Always wear ANSI-approved
safety glasses or a face shield when operating or
observing machinery to reduce the risk of eye
injury or blindness from flying particles. Everyday
eyeglasses are NOT approved safety glasses.
OWNER’S MANUAL. Read and understand this
owner’s manual BEFORE using machine.
TRAINED OPERATORS ONLY. Untrained oper-
ators have a higher risk of being hurt or killed.
Only allow trained/supervised people to use this
machine. When machine is not being used, dis-
connect power, remove switch keys, or lock-out
machine to prevent unauthorized use—especially
around children. Make workshop kid proof!
DANGEROUS ENVIRONMENTS. Do not use
machinery in areas that are wet, cluttered, or have
poor lighting. Operating machinery in these areas
greatly increases the risk of accidents and injury.
MENTAL ALERTNESS REQUIRED. Full mental
alertness is required for safe operation of machin-
ery. Never operate under the influence of drugs or
alcohol, when tired, or when distracted.
For Your Own Safety, Read Instruction
Manual Before Operating This Machine
The purpose of safety symbols is to attract your attention to possible hazardous conditions.
This manual uses a series of symbols and signal words intended to convey the level of impor-
tance of the safety messages. The progression of symbols is described below. Remember that
safety messages by themselves do not eliminate danger and are not a substitute for proper
accident prevention measures. Always use common sense and good judgment.
Indicates a potentially hazardous situation which, if not avoided,
MAY result in minor or moderate injury. It may also be used to alert
against unsafe practices.
Indicates a potentially hazardous situation which, if not avoided,
COULD result in death or serious injury.
Indicates an imminently hazardous situation which, if not avoided,
WILL result in death or serious injury.
This symbol is used to alert the user to useful information about
proper operation of the machine.
NOTICE
Safety Instructions for Machinery
SECTION 1: SAFETY
-14- Model G0768/G0769 (Mfd. Since 8/15)
WEARING PROPER APPAREL. Do not wear
clothing, apparel or jewelry that can become
entangled in moving parts. Always tie back or
cover long hair. Wear non-slip footwear to reduce
risk of slipping and losing control or accidentally
contacting cutting tool or moving parts.
HAZARDOUS DUST. Dust created by machinery
operations may cause cancer, birth defects, or
long-term respiratory damage. Be aware of dust
hazards associated with each workpiece mate-
rial. Always wear a NIOSH-approved respirator to
reduce your risk.
HEARING PROTECTION. Always wear hear-
ing protection when operating or observing loud
machinery. Extended exposure to this noise
without hearing protection can cause permanent
hearing loss.
REMOVE ADJUSTING TOOLS. Tools left on
machinery can become dangerous projectiles
upon startup. Never leave chuck keys, wrenches,
or any other tools on machine. Always verify
removal before starting!
USE CORRECT TOOL FOR THE JOB. Only use
this tool for its intended purpose—do not force
it or an attachment to do a job for which it was
not designed. Never make unapproved modifica-
tions—modifying tool or using it differently than
intended may result in malfunction or mechanical
failure that can lead to personal injury or death!
AWKWARD POSITIONS. Keep proper footing
and balance at all times when operating machine.
Do not overreach! Avoid awkward hand positions
that make workpiece control difficult or increase
the risk of accidental injury.
CHILDREN & BYSTANDERS. Keep children and
bystanders at a safe distance from the work area.
Stop using machine if they become a distraction.
GUARDS & COVERS. Guards and covers reduce
accidental contact with moving parts or flying
debris. Make sure they are properly installed,
undamaged, and working correctly BEFORE
operating machine.
FORCING MACHINERY. Do not force machine.
It will do the job safer and better at the rate for
which it was designed.
NEVER STAND ON MACHINE. Serious injury
may occur if machine is tipped or if the cutting
tool is unintentionally contacted.
STABLE MACHINE. Unexpected movement dur-
ing operation greatly increases risk of injury or
loss of control. Before starting, verify machine is
stable and mobile base (if used) is locked.
USE RECOMMENDED ACCESSORIES. Consult
this owner’s manual or the manufacturer for rec-
ommended accessories. Using improper acces-
sories will increase the risk of serious injury.
UNATTENDED OPERATION. To reduce the
risk of accidental injury, turn machine OFF and
ensure all moving parts completely stop before
walking away. Never leave machine running
while unattended.
MAINTAIN WITH CARE. Follow all maintenance
instructions and lubrication schedules to keep
machine in good working condition. A machine
that is improperly maintained could malfunction,
leading to serious personal injury or death.
DAMAGED PARTS. Regularly inspect machine
for damaged, loose, or mis-adjusted parts—or
any condition that could affect safe operation.
Immediately repair/replace BEFORE operating
machine. For your own safety, DO NOT operate
machine with damaged parts!
MAINTAIN POWER CORDS. When disconnect-
ing cord-connected machines from power, grab
and pull the plug—NOT the cord. Pulling the cord
may damage the wires inside. Do not handle
cord/plug with wet hands. Avoid cord damage by
keeping it away from heated surfaces, high traffic
areas, harsh chemicals, and wet/damp locations.
EXPERIENCING DIFFICULTIES. If at any time
you experience difficulties performing the intend-
ed operation, stop using the machine! Contact our
Technical Support at (570) 546-9663.
Model G0768/G0769 (Mfd. Since 8/15) -15-
Additional Safety for Metal Lathes
CLOTHING, JEWELRY & LONG HAIR. Tie back
long hair, remove jewelry, and do not wear loose
clothing or gloves. These can easily get caught on
rotating parts and pull you into lathe.
ROTATING PARTS. Always keep hands and body
at a safe distance from rotating parts—especially
those with projecting surfaces. Never hold any-
thing against rotating workpiece, such as emery
cloth, that can pull you into lathe.
GUARDING. Guards and covers protect against
entanglement or flying objects. Always ensure they
are properly installed while machine is running.
ADJUSTMENT TOOLS. Remove all chuck keys,
wrenches, and adjustment tools before turning
lathe ON. A tool left on the lathe can become a
deadly projectile when spindle is started.
SAFE CLEARANCES. Before starting spindle,
verify workpiece has adequate clearance by hand-
rotating it through its entire range of motion.
NEW SETUPS. Test each new setup by starting
spindle rotation at the lowest speed and standing
to the side of the lathe until workpiece reaches full
speed and you can verify safe rotation.
SPINDLE SPEEDS. Using spindle speeds that are
too fast for the workpiece or clamping equipment
can cause rotating parts to come loose and strike
nearby people with deadly force. Always use slow
spindle speeds with large or non-concentric work-
pieces. Never exceed rated RPM of the chuck.
CHUCKS. Chucks can be heavy and difficult to
hold. During installation and removal, protect your
hands and precision bed ways by using a chuck
cradle or piece of plywood over the bed ways. Use
lifting equipment, as necessary, for large chucks.
LONG STOCK SAFETY. Long stock can whip
violently if not properly supported. Always support
any stock that extends from the chuck/headstock
more than three times its own diameter.
CLEARING CHIPS. Metal chips can be razor
sharp. Avoid clearing them by hand or with a rag.
Use a brush or vacuum instead.
SECURE WORKPIECE. An improperly secured
workpiece can fly off spindle with deadly force.
Make sure workpiece is properly secured before
starting the lathe.
STOPPING SPINDLE. Always allow spindle to
completely stop on its own, or use a brake, if
provided. Never put hands or another object on a
spinning workpiece to make it stop faster.
CRASHING. A serious explosion of metal parts
can occur if cutting tool or other lathe component
hits rotating chuck or a projecting part of work-
piece. Resulting metal fragments can strike nearby
people and lathe will be seriously damaged. To
reduce risk of crashing, ALWAYS release automat-
ic feeds after use, NEVER leave lathe unattended,
and CHECK all clearances before starting lathe.
TOOL SELECTION. Cutting with incorrect or dull
tooling increases risk of injury from broken or dis-
lodged components, or as a result of extra force
required for operation. Always use sharp tooling
that is right for the job.
SANDING/POLISHING. To reduce risk of entan-
glement, never wrap emery cloth around rotating
workpiece. Instead, use emery cloth with the aid
of a tool or backing board.
MEASURING WORKPIECE. To reduce risk of
entanglement, never measure rotating workpieces.
The primary risks of operating a Metal Lathe are as follows: You can be seriously injured or
killed by getting entangled in, crushed between, or struck by rotating parts on a lathe. You can
be struck with deadly force by unsecured tools or workpieces attached to rotating objects. To
reduce your risk of serious injury when operating this machine, completely heed and understand
the following:
-16- Model G0768/G0769 (Mfd. Since 8/15)
Additional Safety for Mills/Drills
UNDERSTAND ALL CONTROLS. Make sure
you understand the function and proper use of all
controls before starting. This will help you avoid
making mistakes that result in serious injury.
WEAR FACE SHIELD. Always wear a face shield
in addition to safety glasses. This provides more
complete protection for your face than safety
glasses alone.
REMOVE CHUCK KEY & SPINDLE TOOLS.
Always remove chuck key, drawbar wrench, and
other tools used on the spindle immediately after
use. This will prevent them from being thrown by
the spindle upon startup.
PROPERLY SECURE CUTTER. Firmly secure
cutting tool or drill bit so it does not fly out of spin-
dle during operation.
USE CORRECT SPINDLE SPEED. Follow rec-
ommended speeds and feeds for each size and
type of cutting tool. This helps avoid tool breakage
during operation and ensures best cutting results.
INSPECT CUTTING TOOL. Inspect cutting tools
for sharpness, chips, or cracks before each use.
Replace dull, chipped, or cracked cutting tools
immediately.
ALLOW SPINDLE TO STOP. To minimize your
risk of entanglement, always allow spindle to stop
on its own. DO NOT stop spindle using your hand
or any other object.
The primary risks of operating a mill are as follows: You can be seriously injured or killed by
getting clothing, jewelry, or long hair entangled with rotating cutter. You can be severely cut
or have fingers amputated from contact with the rotating cutter. You can be blinded or struck
by broken cutting tools, metal chips, workpieces, or adjustment tools thrown from the rotating
spindle with great force. To reduce your risk of serious injury when operating this machine,
completely heed and understand the following:
SECURE WORKPIECE TO TABLE. Clamp work-
piece to table or secure in a vise mounted to table,
so workpiece cannot unexpectedly shift or spin
during operation. NEVER hold workpiece by hand
during operation.
CLEAN MACHINE SAFELY. Metal chips or shav-
ings can be razor sharp. DO NOT clear chips
by hand or compressed air that can force chips
farther into machine—use a brush or vacuum
instead. Never clear chips while spindle is turning.
PROPERLY MAINTAIN MACHINE. Keep machine
in proper working condition to help ensure that it
functions safely and all guards and other compo-
nents work as intended. Perform routine inspec-
tions and all necessary maintenance. Never oper-
ate machine with damaged or worn parts that can
break or result in unexpected movement during
operation.
DISCONNECT POWER FIRST. To reduce risk of
electrocution or injury from unexpected startup,
make sure mill/drill is turned OFF, disconnected
from power, and all moving parts have come to
a complete stop before changing cutting tools or
starting any inspection, adjustment, or mainte-
nance procedure.
POWER DISRUPTION. In the event of a local
power outage during operation, turn spindle switch
OFF to avoid a possible sudden startup once
power is restored.
Model G0768/G0769 (Mfd. Since 8/15) -17-
Additional Lathe Chuck Safety
ENTANGLEMENT. Entanglement with a rotat-
ing chuck can lead to death, amputation, broken
bones, or other serious injury. Never attempt to
slow or stop the lathe chuck by hand, and always
roll up long sleeves, tie back long hair, and remove
any jewelry or loose apparel BEFORE operating.
CHUCK SPEED RATING. Excessive spindle
speeds greatly increase the risk of the workpiece
or chuck being thrown from the machine with
deadly force. Never use spindle speeds faster than
the chuck RPM rating or the safe limits of your
workpiece.
USING CORRECT EQUIPMENT. Many workpiec-
es can only be safely turned in a lathe if additional
support equipment, such as a tailstock or steady/
follow rest, is used. If the operation is too hazard-
ous to be completed with the lathe or existing
equipment, the operator must have enough experi-
ence to know when to use a different machine or
find a safer way.
TRAINED OPERATORS ONLY. Using a chuck
incorrectly can result in workpieces coming loose
at high speeds and striking the operator or bystand-
ers with deadly force. To reduce the risk of this haz-
ard, read and understand this document and seek
additional training from an experienced chuck user
before using a chuck.
CHUCK CAPACITY. Avoid exceeding the capacity
of the chuck by clamping an oversized workpiece.
If the workpiece is too large to safely clamp with
the chuck, use a faceplate or a larger chuck if pos-
sible. Otherwise, the workpiece could be thrown
from the lathe during operation, resulting in serious
impact injury or death.
CLAMPING FORCE. Inadequate clamping force
can lead to the workpiece being thrown from the
chuck and striking the operator or bystanders.
Maximum clamping force is achieved when the
chuck is properly maintained and lubricated, all
jaws are fully engaged with the workpiece, and
the maximum chuck clamping diameter is not
exceeded.
PROPER MAINTENANCE. All chucks must be
properly maintained and lubricated to achieve
maximum clamping force and withstand the rigors
of centrifugal force. To reduce the risk of a thrown
workpiece, follow all maintenance intervals and
instructions in this document.
DISCONNECT POWER. Serious entanglement or
impact injuries could occur if the lathe is started
while you are adjusting, servicing, or installing the
chuck. Always disconnect the lathe from power
before performing these procedures.
-18- Model G0768/G0769 (Mfd. Since 8/15)
SECTION 2: POWER SUPPLY
Availability
Before installing the machine, consider the avail-
ability and proximity of the required power supply
circuit. If an existing circuit does not meet the
requirements for this machine, a new circuit must
be installed. To minimize the risk of electrocution,
fire, or equipment damage, installation work and
electrical wiring must be done by an electrician or
qualified service personnel in accordance with all
applicable codes and standards.
Electrocution, fire, or
equipment damage may
occur if machine is not
correctly grounded and
connected to the power
supply.
Full-Load Current Rating
The full-load current rating is the amperage a
machine draws at 100% of the rated output power.
On machines with multiple motors, this is the
amperage drawn by the largest motor or sum of all
motors and electrical devices that might operate
at one time during normal operations.
Full-Load Rating ..........................................10A
The full-load current is not the maximum amount
of amps that the machine will draw. If the machine
is overloaded, it will draw additional amps beyond
the full-load rating.
If the machine is overloaded for a sufficient length
of time, damage, overheating, or fire may result—
especially if connected to an undersized circuit.
To reduce the risk of these hazards, avoid over-
loading the machine during operation and make
sure it is connected to a power supply circuit that
meets the specified circuit requirements.
For your own safety and protection of
property, consult an electrician if you are
unsure about wiring practices or electrical
codes in your area.
Note: Circuit requirements in this manual apply to
a dedicated circuit—where only one machine will
be running on the circuit at a time. If machine will
be connected to a shared circuit where multiple
machines may be running at the same time, con-
sult an electrician or qualified service personnel to
ensure circuit is properly sized for safe operation.
A power supply circuit includes all electrical
equipment between the breaker box or fuse panel
in the building and the machine. The power sup-
ply circuit used for this machine must be sized to
safely handle the full-load current drawn from the
machine for an extended period of time. (If this
machine is connected to a circuit protected by
fuses, use a time delay fuse marked D.)
110V Circuit Requirements
This machine is prewired to operate on a power
supply circuit that has a verified ground and meets
the following requirements:
Nominal Voltage .................... 110V, 115V, 120V
Cycle ..........................................................60 Hz
Phase ........................................... Single-Phase
Power Supply Circuit ......................... 15 Amps
Serious injury could occur if you connect
machine to power before completing setup
process. DO NOT connect to power until
instructed later in this manual.
Model G0768/G0769 (Mfd. Since 8/15) -19-
Improper connection of the equipment-grounding
wire can result in a risk of electric shock. The
wire with green insulation (with or without yellow
stripes) is the equipment-grounding wire. If repair
or replacement of the power cord or plug is nec-
essary, do not connect the equipment-grounding
wire to a live (current carrying) terminal.
Check with a qualified electrician or service per-
sonnel if you do not understand these grounding
requirements, or if you are in doubt about whether
the tool is properly grounded. If you ever notice
that a cord or plug is damaged or worn, discon-
nect it from power, and immediately replace it with
a new one.
Extension Cords
We do not recommend using an extension cord
with this machine.
If you must use an extension
cord, only use it if absolutely necessary and only
on a temporary basis.
Extension cords cause voltage drop, which can
damage electrical components and shorten motor
life. Voltage drop increases as the extension cord
size gets longer and the gauge size gets smaller
(higher gauge numbers indicate smaller sizes).
Any extension cord used with this machine must
be in good condition and contain a ground wire
and matching plug/receptacle. Additionally, it must
meet the following size requirements:
Minimum Gauge Size ...........................14 AWG
Maximum Length (Shorter is Better).......50 ft.
Grounding & Plug Requirements
Figure 9. Typical 5-15 plug and receptacle.
Grounding Prong
Neutral Hot
5-15 PLUG
GROUNDED
5-15 RECEPTACLE
SHOCK HAZARD!
Two-prong outlets do not meet the grounding
requirements for this machine. Do not modify
or use an adapter on the plug provided—if
it will not fit the outlet, have a qualified
electrician install the proper outlet with a
verified ground.
This machine MUST be grounded. In the event
of certain malfunctions or breakdowns, grounding
reduces the risk of electric shock by providing a
path of least resistance for electric current.
This machine is equipped with a power cord that
has an equipment-grounding wire and a grounding
plug. Only insert plug into a matching receptacle
(outlet) that is properly installed and grounded in
accordance with all local codes and ordinances.
DO NOT modify the provided plug!
-20- Model G0768/G0769 (Mfd. Since 8/15)
SECTION 3: SETUP
Your machine was carefully packaged for safe
transportation. Remove the packaging materials
from around your machine and inspect it. If you
discover any damage, please call us immediately
at (570) 546-9663
for advice.
Save the containers and all packing materials for
possible inspection by the carrier or its agent.
Otherwise, filing a freight claim can be difficult.
When you are completely satisfied with the condi-
tion of your shipment, inventory the contents.
Unpacking
The list below outlines the basic process of setting
up the machine for first-time operation. Specific
steps are covered later in this section.
The typical setup process is as follows:
1. Unpack machine and inventory contents of
box/crate.
2. Clean machine and its components.
3. Move machine to an acceptable location.
4. Assemble machine and make sure it is ready
for operation.
5. Connect machine to power source.
6. Test run machine and various safety compo-
nents to ensure they function properly.
7. Perform spindle break-in procedure to pre-
pare spindle bearings for operational loads.
Setup Overview
SUFFOCATION HAZARD!
Keep children and pets away
from plastic bags or packing
materials shipped with this
machine. Discard immediately.
The following are needed to complete the setup
process, but are not included with your machine.
Description
• Additional People
• Safety Glasses
• Cleaner/Degreaser (Page 22)
• Quality Metal Protectant
• Disposable Shop Rags
• Forklift
• Lifting Slings (rated for at least 300 lbs.)
• Mounting Hardware (Page 25)
Needed for Setup
Model G0768/G0769 (Mfd. Since 8/15) -21-
Inventory
The following is a list of items shipped with your
machine. Before beginning setup, lay these items
out and inventory them.
If any non-proprietary parts are missing (e.g. a
nut or a washer), we will gladly replace them; or
for the sake of expediency, replacements can be
obtained at your local hardware store.
Installed Components (Figure 10) Qty.
A. 3-Jaw Chuck 4" w/Internal Jaw Set ............ 1
B. Steady Rest ................................................ 1
C. 4-Way Tool Post ......................................... 1
D. Drill Chuck 1⁄2" w/Chuck Key (G0769) ........ 1
E. Milling Headstock (G0769) ......................... 1
F. Backsplash ................................................. 1
G. Tailstock ...................................................... 1
H. Follow Rest (Not Shown) ............................ 1
V. Fuse Set ..................................................... 1
— 10A (G0768) ........................................... 1
— 15A (G0768) ........................................... 1
— 10A (G0769) ........................................... 2
— 15A (G0769) ........................................... 1
W. Dead Center MT#2 .................................... 1
X. Dead Center MT#3 ..................................... 1
Y. Change Gear Set ....................................... 1
— Change Gear (20-tooth, Installed) ......... 2
— Change Gear (30-tooth, Installed) ......... 2
— Change Gear (33-tooth) ......................... 1
— Change Gear (40-tooth) ......................... 1
— Change Gear (50-tooth) ......................... 1
— Change Gear (53-tooth) ......................... 1
— Change Gear (55-tooth) ......................... 1
— Change Gear (57-tooth) ......................... 1
— Change Gear (60-tooth) ......................... 1
— Change Gear (63-tooth) ......................... 1
— Change Gear (65-tooth) ......................... 1
— Change Gear (70-tooth) ......................... 1
— Change Gear (71-tooth) ......................... 1
— Change Gear (72-tooth) ......................... 1
— Change Gear (80-tooth, Installed) ......... 2
— Change Gear (84-tooth, Installed) ......... 1
Z. 4-Jaw Universal Chuck 4" (Not Shown) ..... 1
NOTICE
If you cannot find an item on this list, care-
fully check around/inside the machine and
packaging materials. Often, these items get
lost in packaging materials while unpack-
ing or they are pre-installed at the factory.
Loose Components (Figure 11) Qty.
I. Chip Pan (Not Shown) ................................ 1
J. Toolbox ....................................................... 1
K. Oil Bottle for Oil .......................................... 1
L. Faceplate 63⁄4" ........................................... 1
M. 3-Jaw Chuck External Jaw Set .................. 1
N. Hex Wrench Set (2.5, 3, 4, 5, 6mm) ......1 Ea
O. Flat Head Screwdriver #2 ........................... 1
P. Phillips Head Screwdriver #2 ..................... 1
Q. Spanner Wrench ........................................ 1
R. Wrench Set (6/7, 8/10, 14/16mm) ............... 1
S. Lathe Chuck Key ........................................ 1
T. Square Socket T-Wrench ........................... 1
U. Handwheel Handles ................................... 2
Figure 10. Installed components (G0769 shown).
A
BCF
G
D
E
Figure 11. Packaged components.
S
U
L
M
N
O
P
Q
R
T
U
V
WXY
J
K
S
-22- Model G0768/G0769 (Mfd. Since 8/15)
The unpainted surfaces of your machine are
coated with a heavy-duty rust preventative that
prevents corrosion during shipment and storage.
This rust preventative works extremely well, but it
will take a little time to clean.
Be patient and do a thorough job cleaning your
machine. The time you spend doing this now will
give you a better appreciation for the proper care
of your machine's unpainted surfaces.
There are many ways to remove this rust preven-
tative, but the following steps work well in a wide
variety of situations. Always follow the manufac-
turer’s instructions with any cleaning product you
use and make sure you work in a well-ventilated
area to minimize exposure to toxic fumes.
Before cleaning, gather the following:
• Disposable rags
• Cleaner/degreaser (WD•40 works well)
• Safety glasses & disposable gloves
• Plastic paint scraper (optional)
Basic steps for removing rust preventative:
1.
Put on safety glasses.
2.
Coat the rust preventative with a liberal
amount of cleaner/degreaser, then let it soak
for 5–10 minutes.
3.
Wipe off the surfaces. If your cleaner/degreas-
er is effective, the rust preventative will wipe
off easily. If you have a plastic paint scraper,
scrape off as much as you can first, then wipe
off the rest with the rag.
4.
Repeat Steps 2–3 as necessary until clean,
then coat all unpainted surfaces with a quality
metal protectant to prevent rust.
Gasoline and petroleum
products have low flash
points and can explode
or cause fire if used to
clean machinery. Avoi d
using these products
to clean machinery.
Many cleaning solvents
are toxic if inhaled. Only
work in a well-ventilated
area.
NOTICE
Avoid chlorine-based solvents, such as
acetone or brake parts cleaner, that may
damage painted surfaces.
Cleanup
T23692—Orange Power Degreaser
A great product for removing the waxy shipping
grease from your machine during clean up.
Figure 12. T23692 Orange Power Degreaser.
Model G0768/G0769 (Mfd. Since 8/15) -23-
Site Considerations
Weight Load
Refer to the
Machine Data Sheet for the weight
of your machine. Make sure that the surface upon
which the machine is placed will bear the weight
of the machine, additional equipment that may be
installed on the machine, and the heaviest work-
piece that will be used. Additionally, consider the
weight of the operator and any dynamic loading
that may occur when operating the machine.
Space Allocation
Consider the largest size of workpiece that will
be processed through this machine and provide
enough space around the machine for adequate
operator material handling or the installation of
auxiliary equipment. With permanent installations,
leave enough space around the machine to open
or remove doors/covers as required by the main-
tenance and service described in this manual.
See below for required space allocation.
Physical Environment
The physical environment where the machine is
operated is important for safe operation and lon-
gevity of machine components. For best results,
operate this machine in a dry environment that is
free from excessive moisture, hazardous chemi-
cals, airborne abrasives, or extreme conditions.
Extreme conditions for this type of machinery are
generally those where the ambient temperature
range exceeds 41°–104°F; the relative humidity
range exceeds 20%–95% (non-condensing); or
the environment is subject to vibration, shocks,
or bumps.
Electrical Installation
Place this machine near an existing power source.
Make sure all power cords are protected from
traffic, material handling, moisture, chemicals, or
other hazards. Make sure to leave enough space
around machine to disconnect power supply or
apply a lockout/tagout device, if required.
Lighting
Lighting around the machine must be adequate
enough that operations can be performed safely.
Shadows, glare, or strobe effects that may distract
or impede the operator must be eliminated.
Children or untrained people
may be seriously injured by
this machine. Only install in an
access restricted location.
Figure 13. Minimum working clearances.
36"
16"
Keep
Workpiece
Loading
Area
Unobstructed
Keep
Workpiece
Loading
Area
Unobstructed
36"
20"
Model G0768 Model G0769
-24- Model G0768/G0769 (Mfd. Since 8/15)
Lifting & Placing
HEAVY LIFT!
Straining or crushing injury
may occur from improperly
lifting machine or some of
its parts. To reduce this risk,
get help from other people
and use a forklift (or other
lifting equipment) rated for
weight of this machine.
Do not attempt to lift or move the machine with-
out using the proper lifting equipment (such as
a forklift or crane) or the necessary assistance
from other people. Refer to Needed for Setup on
Page 20 for details.
To lift and place machine:
1. Remove shipping crate top and sides, then
remove chip pan, 4-jaw chuck, faceplate, and
toolbox from shipping pallet.
2. Position chip pan on selected mounting sur-
face and use it as a template to mark hole
locations for mounting hardware (refer to
Leveling & Mounting on Page 25).
— If mounting machine to optional T26599
stand (see Accessories on Page 68),
align holes in chip pan with pre-drilled
mounting holes in stand.
3. Unbolt machine from shipping pallet.
Only use lifting slings and power lifting
equipment rated for at least 300 lbs. and in
good working condition. If machine falls or
tips over while moving it, serious personal
injury and property damage could result.
4. To balance load for lifting, move tailstock and
carriage to extreme right end of bedway, then
lock them in place.
Note: Before trying to move carriage, make
sure carriage lock is loose and half nut is
disengaged.
5. Wrap lifting slings around bed and between
leadscrew and bedway, as shown in Figure
14, to help prevent bending leadscrew during
lifting.
6. Attach lifting slings to forklift forks (or other
power lifting equipment).
Note: To balance the load when lifting, the
lifting strap closest to the headstock must be
slightly shorter than the lifting strap on the
tailstock side. If you are using lifting straps of
equal length, this can be achieved by wrap-
ping the lifting strap on the headstock side
one or more times around the forklift fork, or
by placing a block of wood on the fork to raise
up the ends of the lifting strap.
7. Have an assistant hold mill headstock to
steady load, then lift machine just enough to
clear any obstacles and move it to its mount-
ing position.
8. Properly mount machine as instructed in
Mounting subsection on Page 25.
Figure 14. Example of lifting sling positions.
Lifting
Sling
Model G0768/G0769 (Mfd. Since 8/15) -25-
Mounting
—If mounting machine to a stand, follow the
instructions included with it. Ensure stand
is anchored to floor.
The chip pan and lathe base have holes that allow
the machine to be mounted to the optional Model
T26599 Stand (see Figure 15) or a workbench.
Number of Mounting Holes ............................ 2
Diameter of Mounting Hardware ................ 5⁄16"
Figure 15. T26599 Stand for G0768/G0769.
The T26599 Stand is specifically designed for
the G0768/G0769 and comes with pre-drilled
mounting holes that match the base of these
machines. You MUST mount your machine
to a stand or workbench to prevent it from
unexpectedly moving during operation, which
could lead to personal injury or property damage.
Follow these guidelines when mounting your
machine to ensure safe and accurate cutting
results:
• Make sure stand or workbench can ade-
quately support weight of machine and mate-
rials, and that it will not move or vibrate dur-
ing operation.
• Use a silicon sealant between the machine
base and chip pan to prevent coolant or other
fluids from leaking through onto the stand,
workbench, or floor.
Chip Pan
Workbench
Hex Bolt
Flat Washer
Flat Washer
Silicon
Lock Washer
Hex Nut
Lathe
Figure 16. Example of a "Through Mount" setup.
— If mounting machine to a workbench, drill
holes all the way through workbench, and
use hex bolts, washers, and hex nuts to
secure machine in place (see example
below).
-26- Model G0768/G0769 (Mfd. Since 8/15)
With the exception of the handwheel handles, the
lathe is shipped fully assembled.
Use a flat head screwdriver to attach the handwheel
handles shown in Figure 18.
Assembly
Figure 18. Handwheel handles installed.
Carriage
Handle
Cross Slide
Handle
Figure 17. Grizzly Model H2683 12" Master
Machinist's Level.
Leveling machinery helps precision components,
such as bedways, remain straight and flat dur-
ing the lifespan of the machine. The bed on a
lathe that is not level may slowly twist due to the
dynamic loads placed on the machine during
operation.
For best results, use a precision level that is at
least 12" long and sensitive enough to show a
distinct movement when a 0.003" shim (approxi-
mately the thickness of one sheet of standard
newspaper) is placed under one end of the level.
See Figure 17 for an example of a high-precision
level.
For accurate turning results and to prevent
warping the cast iron bed and ways, the
lathe bedways MUST be leveled from side-
to-side and from front-to-back on both ends.
Recheck the bedways 24 hours after
installation, two weeks after that, and then
annually to make sure they remain level.
Leveling
Model G0768/G0769 (Mfd. Since 8/15) -27-
Test Run
Once assembly is complete, test run the machine
to ensure it is properly connected to power and
safety components are functioning properly.
If you find an unusual problem during the test run,
immediately stop the machine, disconnect it from
power, and fix the problem BEFORE operating the
machine again. The
Troubleshooting
table in the
SERVICE section of this manual can help.
DO NOT start machine until all preceding
setup instructions have been performed.
Operating an improperly set up machine
may result in malfunction or unexpect-
ed results that can lead to serious injury,
death, or machine/property damage.
Serious injury or death can result from
using this machine BEFORE understanding
its controls and related safety information.
DO NOT operate, or allow others to operate,
machine until the information is understood.
To test run machine:
1. Make sure all tools and objects used during
setup are cleared away from machine.
2. Press Emergency Stop button cover (see
Figure 19) to prevent unexpected start up.
Figure 19. Headstock controls (G0769 shown).
Spindle Direction
Switch Set to "O"
Spindle Speed
Dial
Lathe/Mill
Selector Switch
Emergency
Stop Button
3. Set spindle direction switch to neutral ("0"
position), and rotate spindle speed dial all the
way counterclockwise.
G0769 Only: Set lathe/mill selector switch to
"0" (see Figure 19 on Page on this page).
4. Shift feed direction dial to neutral (see Figure
20).
Figure 21. Half nut lever disengaged.
Half Nut
Lever
Engaged
Half Nut
Lever
Disengaged
5. Make sure chuck and jaws, if installed, are
secure (see Chuck Installation on Page 32).
Note: If a chuck is not installed on the lathe,
you do not need to install one for this test run.
6. Disengage half nut with lever shown in
Figure 21.
Figure 20. Neutral feed direction dial setting.
Feed Direction Dial
LEFT
(Clockwise Rotation)
RIGHT
(CCW Rotation)
CENTER
(Neutral)
Feed
Direction
Lever
-28- Model G0768/G0769 (Mfd. Since 8/15)
7. Connect machine to power. The spindle
speed RPM display will illuminate.
8. Press tab in on side of Emergency Stop but-
ton and lift switch cover to reset it.
9. Turn spindle direction switch to "F" position.
G0769 Only: Set lathe/mill selector switch to
"1" for lathe mode.
10. Press green ON button, leaving switch cover
open.
11. Slowly rotate spindle speed dial clockwise
until spindle speed display shows 100 RPM.
The spindle should rotate counterclockwise—
down and toward front of lathe.
The machine should run smoothly with little to
no vibration or rubbing noises.
— Strange or unusual noises should be
investigated and corrected before operat-
ing machine further. Always disconnect
machine from power when investigating or
correcting potential problems.
12. Press Emergency Stop button to turn lathe
OFF. Then, without resetting Emergency
Stop button, try to restart spindle rotation by
rotating spindle speed dial all the way coun-
terclockwise and then clockwise. The spindle
should not start.
—If the spindle does start with Emergency
Stop button pressed in, the button is not
operating correctly. This safety feature
must operate properly before continuing
operation. Turn spindle speed dial all the
way counterclockwise to stop lathe, discon-
nect it from power, and call Tech Support
for help.
Model G0768: Congratulations! Test Run is
complete! Now perform the Spindle Break-
In procedure beginning on Page 29.
Model G0769: Continue with remaining test
run instructions.
Gearbox Knob
L
(Low)
H
(High)
CENTER
(Neutral)
Figure 22. High/low gearbox knob set to low "L".
16. Reset Emergency Stop button.
17. Press green ON button.
18. Rotate spindle speed dial clockwise until
spindle speed display shows 50 RPM.
19. Mill spindle should begin clockwise rotation
(as viewed from top).
20. Press Emergency Stop button.
Congratulations! Model G0769 test run is
complete. Now perform the Spindle Break-
In procedure.
13. Rotate spindle speed dial all the way counter-
clockwise.
14. Set lathe/mill selector switch to "2" for mill
mode.
15. Rotate high/low gearbox knob to low "L" (see
Figure 22).
Note: It may be necessary to rotate spindle
by hand so gears will mesh.
Gearbox
Knob
Model G0768/G0769 (Mfd. Since 8/15) -29-
Lathe Spindle Break-In
1. Successfully complete Test Run procedure
beginning on Page 27.
2. Reset Emergency Stop button.
G0769 Only: Set lathe/mill selector switch to
"1" for lathe mode.
3. Press green ON button.
4. Rotate spindle speed dial until spindle speed
display shows 50 RPM and run lathe for mini-
mum of 10 minutes.
5. Without stopping lathe, use spindle speed
dial to run lathe at 1000 and 2000 RPM for
10 minutes each.
Note: If necessary, refer to Setting Spindle
Speed on Page 47 for detailed instructions.
Spindle Break-In
The spindle break-in procedure distributes lubri-
cation
throughout the bearings to
reduce the risk
of early
bearing failure
if there are any "dry" spots
or areas where lubrication has settled in the bear-
ings. You
must complete this procedure b
efore
placing
operational loads on the spindle
for the
first time when the machine is new or if it has
been sitting idle for longer than 6 months.
Always start the spindle break-in at the lowest
speed to minimize wear if there
are dry spots.
Allow the spindle to run long enough to warm up
and distribute the bearing grease, then incremen-
tally increase spindle speeds and repeat this pro-
cess at each speed until reaching the maximum
spindle speed. Following the break-in procedure
in this progressive manner helps minimize any
potential wear that could occur before lubrication
is fully distributed.
You must complete this procedure to main-
tain the warranty. Failure to do this could
cause rapid wear-and-tear of spindle bear-
ings once they are placed under load.
6. Rotate spindle speed dial all the way coun-
terclockwise, then press Emergency Stop
button.
7. Set spindle direction switch to "R", then reset
Emergency Stop button.
8. Press ON button.
9. Rotate spindle speed dial to 2000 RPM and
run lathe for 10 minutes.
10. Rotate spindle speed dial all the way coun-
terclockwise, then press Emergency Stop
button.
Congratulations! Lathe spindle break-in is com-
plete.
Mill Spindle Break-In (G0769 Only)
1. Successfully complete Lathe Spindle Break-
In.
2. Set spindle direction switch to "F".
3. Set lathe/mill selector switch to "2" for mill
mode.
4. Rotate high/low gearbox knob to low "L."
5. Reset Emergency Stop button.
6. Press ON button.
7. Rotate spindle speed dial clockwise to 50
RPM and run spindle for a minimum of 10
minutes.
8. Rotate spindle speed dial all the way counter-
clockwise.
9. Press Emergency Stop button.
10. Rotate high/low gearbox knob to high "H".
11. Reset Emergency Stop button.
12. Press ON button.
13. Use spindle speed dial to run mill at 1000 and
2000 RPM for 10 minutes each.
-30- Model G0768/G0769 (Mfd. Since 8/15)
The following adjustments have been made at the
factory. However, because of the many variables
involved with shipping, we recommend you verify
these adjustments to ensure the best results:
Factory adjustments that should be verified:
• Tailstock alignment ........................ Page 39
• Cross slide backlash adjustment .....Page 82
• Leadscrew backlash ........................Page 82
• Gib adjustments ............................. Page 83
Recommended
Adjustments
14. Rotate spindle speed dial all the way coun-
terclockwise, then press Emergency Stop
button.
15. Repeat Steps 7–10 from Lathe Spindle
Break-In in a similar manner for mill.
Congratulations! Mill spindle break-in is complete.
Model G0768/G0769 (Mfd. Since 8/15) -31-
SECTION 4: LATHE OPERATIONS
Operation Overview To complete a typical lathe operation, the
operator does the following:
1. Securely mounts workpiece in lathe.
2. Puts on safety glasses and a face shield, rolls
up sleeves, removes jewelry, and secures
any clothing, jewelry, or hair that could get
entangled in moving parts.
3. Installs tooling on toolpost, then backs it
away to establish a safe startup clearance.
4. Removes all setup tools from lathe.
5. Checks for safe clearances by rotating
workpiece by hand at least one full revolution.
6. Moves slides to where they will be used dur-
ing operation.
7. If using power feed, selects appropriate feed
rate and direction.
8. Resets Emergency Stop button and turns
spindle direction switch to "F".
9. Presses ON button and rotates spindle speed
dial to set correct spindle speed.
10. Uses carriage handwheels or power feed
options to move tooling into workpiece for
operations.
11. When finished turning, rotates spindle speed
dial completely counterclockwise, press-
es Emergency Stop button, then removes
workpiece.
The purpose of this overview is to provide the nov-
ice machine operator with a basic understanding
of how the machine is used during operation, so
the
machine controls/components
discussed later
in this manual
are easier to understand.
Due to the generic nature of this overview, it is
not intended to be an instructional guide. To learn
more about specific operations, read this entire
manual and
seek additional training from expe-
rienced
machine operators, and do additional
research outside of this manual by reading "how-
to" books, trade magazines, or websites.
To reduce your risk of
serious injury, read this
entire manual BEFORE
using machine.
If you are not experienced with this type
of machine, WE STRONGLY RECOMMEND
that you seek additional training outside of
this manual. Read books/magazines or get
formal training before beginning any proj-
ects. Regardless of the content in this sec-
tion, Grizzly Industrial will not be held liable
for accidents caused by lack of training.
To reduce risk of eye or face injury from
flying chips, always wear approved safety
glasses and face shield when operating this
machine.
-32- Model G0768/G0769 (Mfd. Since 8/15)
Chuck & Faceplate
Mounting
This lathe ships with the 3-jaw chuck installed.
This is a scroll-type chuck where all three jaws
move in unison when the chuck key is used.
The included 4-jaw chuck features independent
jaws, which are used for square or unevenly-
shaped stock, and to mount work that needs to be
adjusted to near zero total indicated runout.
The included faceplate has slots for T-bolts that
hold standard or custom clamping hardware. With
the correct clamping hardware, a faceplate offers
a wide range of uses, including machining non-
concentric workpieces, straight turning between
centers, off-center turning, and boring.
This lathe ships with the 3-jaw chuck installed.
This is a scroll-type chuck where all three jaws
move in unison when the chuck key is used.
The included 4-jaw chuck features independent
jaws, which are used for square or unevenly-
shaped stock, and to mount work that needs to be
adjusted to near zero total indicated runout.
The included faceplate has slots for T-bolts that
hold standard or custom clamping hardware. With
the correct clamping hardware, a faceplate offers
a wide range of uses, including machining non-
concentric workpieces, straight turning between
centers, off-center turning, and boring.
Never use spindle speeds faster than chuck
RPM rating or safe limits of your workpiece.
Excessive spindle speeds greatly increase
risk of workpiece or chuck being thrown
from machine with deadly force!
This lathe is equipped with an intrinsic backplate
spindle nose. With this type of spindle, a chuck or
faceplate is mounted directly to the backplate with
hex nuts.
Installation &
Removal Device
Figure 23. Example of common device used
during chuck installation and removal.
Plywood Protection
Plate for Chucks
Installed by Hand
Place a piece of plywood over the bedways to pro-
tect them from damage if a chuck or other tooling
is dropped (see below).
Chuck Installation
To ensure accurate work, it is extremely important
to make sure the spindle nose and chuck mating
surfaces are clean. Even a small amount of lint or
debris can affect accuracy.
The chuck is properly installed when it is seated
against the backplate shoulder (see Figure 24).
Tools Needed: Qty
Open-End Wrench 13mm .................................. 1
Lathe Chuck Key ............................................... 1
To install chuck:
1. DISCONNECT MACHINE FROM POWER!
2. Use an appropriate device to protect ways
(refer to Installation & Removal Device
subsection).
3. Thoroughly clean and wipe down all mating
surfaces with a lightly-oiled, lint-free rag.
Figure 24. Spindle backplate parts.
Inside
Taper
Mounting
Hole Shoulder
Model G0768/G0769 (Mfd. Since 8/15) -33-
4. Insert chuck screws through mounting holes
in spindle backplate, as shown in Figure 25.
Make sure chuck seats firmly and evenly
against backplate shoulder.
This 3-jaw, scroll-type chuck has an internal scroll-
gear
that moves all jaws in unison when a
djusted
with the chuck key
. This chuck holds
cylindrical
parts on-center with the axis of spindle rotation
and can be
rotated
at high speeds if the workpiece
is properly clamped and balanced.
Never mix jaw types or
positions to
accommodate an odd-shaped workpiece.
T
he
chuck will spin out of balance an
d
may throw the
workpiece
!
Instead, use an independent jaw chuck
or a faceplate.
Insufficient
Jaw Clamping Unstable
Workpiece
Bar Stock
Cylinder
Unsafe Jaw Position
Poor Scroll
Gear Engagement
Safer Inside
Jaw Use
Unsafe Inside
Jaw Use
Unsafe Jaw
Position
Safer Outside
Jaw Use
Poor Scroll Gear Engagement
Unsafe Jaw Position and
Poor Scroll
Gear
Engagement
Poor Grip
Unstable
Workpiece
Shallow
Bar Stock
Shallow
Bar Stock
Safer Outside
Jaw Use
Safer Inside
Jaw Use
CORRECT
CORRECT
CORRECT
CORRECT
INCORRECT
INCORRECT
INCORRECT
INCORRECT
Scroll Chuck
Clamping
Figure 27. Jaw selection and workpiece holding.
5. Use a lock washer and hex nut on each
chuck screw to secure chuck (see Figure
26). Tighten hex nuts evenly a small amount
at a time and in multiple steps.
Figure 26. Chuck secured against backplate.
Hex Nut
Flat Washer
Figure 25. Inserting chuck into backplate.
Chuck Screw
Spindle
Backplate
-34- Model G0768/G0769 (Mfd. Since 8/15)
Changing Jaw Set
The 3-jaw scroll chuck included with the lathe
features inside and outside
hardened steel jaw
sets
(see Figure below), which
move in unison to
center a concentric workpiece.
When installing the jaws
, it is important to make
sure they are installed correctly. Incorrect installa-
tion will result in jaws that do not converge evenly
and are unable to securely clamp a workpiece.
Jaws are numbered from 1–3 (see Figure below).
The number is typically stamped on the side or
bottom. Jaws are designed to be installed coun-
terclockwise in numerical order in the matching
numbered jaw guides, so they will hold a concen-
tric workpiece evenly.
To change jaw set:
1.
DISCONNECT MACHINE FROM POWER!
2.
Use appropriate device to protect ways
(refer
to Installation & Removal Device
subsec-
tion).
3.
Insert chuck key and turn it counterclockwise
to back jaws out and remove them individu-
ally in descending order (i.e., 3, 2, 1).
4.
Use mineral spirits to clean debris and grime
from jaws and chuck jaw guides.
5.
Apply thin coat of NLGI #2 grease to surfaces
of removed jaw set. Store i
n safe place free
from moisture and abrasives.
6.
Rotate chuck key clockwise until you see tip
of outer scroll-gear lead thread about to enter
a jaw guide (see below).
Figure 28. Chuck and jaw selection.
Inside SetOutside Set
Figure 29. Jaw guide and jaw numbers.
Jaw Guides
1
2
3
Jaw Numbers
1
2
3
Lead Thread
1
1
2
3
Figure 30. Lead thread on scroll gear.
7. Insert jaw #1 into jaw guide #1 and hold jaw
against scroll-gear.
8
. Rotate chuck key clockwise one turn to
engage tip of scroll-gear lead thread into jaw.
Pull jaw; it should be locked into jaw guide.
9
. Install remaining jaws in numerical order, in
the same manner. The jaws should
converge
evenly at center of chuck.
— If jaws do not converge evenly, remove
them. Check that jaw numbers and jaw
guides match. Re-install jaws
sequentially
1–3, making sure each one engages with
scroll-gear lead thread during its first rota-
tion.
Model G0768/G0769 (Mfd. Since 8/15) -35-
Figure 31. 4-jaw chuck tightening sequence.
1
2
3
4
Workpiece
Center Point
Figure 32. Example of a non-cylindrical
workpiece correctly positioned on a 4-jaw chuck.
4-Jaw Chuck
Refer to the Chuck Installation subsection for
instructions on installing the 4-jaw chuck.
The 4-jaw chuck features independently adjust-
able jaws for holding non-concentric or off-center
workpieces. Each jaw can be independently
removed from the chuck body and reversed for a
wide range of work holding versatility.
Because of dynamic forces involved in
machining a non-concentric or off-center
workpiece, always use a low spindle speed
to reduce risk of workpiece coming loose
and being thrown from lathe, which could
cause death or serious personal injury.
Mounting Workpiece
1.
DISCONNECT MACHINE FROM POWER!
2.
Use an appropriate device to protect ways
(refer to
Installation & Removal Device
subsection).
3.
Use chuck key to open each jaw so work-
piece will fit into spindle opening and lay flat
against chuck face and jaw steps.
4.
With help from another person or a holding
device, position workpiece so it is centered in
chuck.
5. Tighten each jaw in small increments. After
tightening first jaw, continue tightening
remaining jaws in an opposing sequence,
similar to sequential order shown below.
6. After workpiece is secured by jaws, use dial
indicator to make sure workpiece is centered
in chuck.
— If workpiece is not correctly centered,
make fine adjustments by slightly
loosening
one jaw and tightening opposing jaw until
workpiece is correctly positioned (see
below for an example).
-36- Model G0768/G0769 (Mfd. Since 8/15)
Figure 33. Example of a workpiece clamped in a
faceplate.
Faceplate
Non-Cylindrical
Workpiece
Clamp
To mount non-concentric workpiece to face-
plate:
1.
DISCONNECT MACHINE FROM POWER!
2.
Use appropriate device to protect ways
(refer
to Chuck Safety & Support Devices
sub-
section).
3.
With help from another person or holding
device to support workpiece, position it onto
faceplate and clamp it in place with a mini-
mum of three independent clamping devices
(see below for an example).
Be sure to take into account rotational and
cutting forces that will be applied to work-
piece when clamping it to faceplate. If neces-
sary, use counter-weights to balance assem-
bly and use a dial indicator to make sure
workpiece is properly positioned for your
operation.
Faceplate
Failure to properly secure workpiece to
faceplate could cause workpiece to be
thrown from lathe with deadly force. To
reduce this risk, use a minimum of THREE
independent clamping devices to hold
workpiece onto faceplate.
Machining non-concentric workpieces at
high speeds could cause workpiece to be
thrown from lathe with deadly force. To
reduce this risk, use a low
RPM, and use
counter-weights to balance faceplate or
workpiece.
Refer to the prior Chuck Installation subsection
for instructions on installing the faceplate.
The faceplate included with your lathe can be
used for a wide range of operations, including
machining non-concentric workpieces, straight
turning between centers, off-center turning, and
boring.
The tools needed for mounting a workpiece will
vary depending on the type of setup you have.
Model G0768/G0769 (Mfd. Since 8/15) -37-
Tailstock
The tailstock is typically used to support long
workpieces at the side opposite the spindle, using
a live or dead center. It can also hold a tapered
drill bit (or a drill chuck with a regular drill bit) for
boring holes. Unlike boring done with a drill press
where the workpiece is fixed and the drill bit
rotates, the drill bit in a tailstock remains station-
ary while the workpiece is rotated by the spindle.
The entire tailstock can be repositioned and
locked in place along the length of the bed. An
independently controlled offset adjustment allows
the upper part of the tailstock to move perpen-
dicular to the bedways so it can be aligned with
the spindle center (for concentric turning) or offset
from the spindle center (for tapered turning).
The tailstock quill also features independent
adjustment controls that allow it to be advanced
toward the spindle or locked firmly in position.
Graduated Dial on Handwheel
Increments ................................................. 0.001"
One Full Revolution ..................................... 0.04"
Increments on Quill Scale
Inch ................................ 0"–2" in 1⁄8" Increments
Metric .................... 0–50mm in 1mm Increments
Tailstock Quill Specs
Positioning Tailstock
1. Rotate tailstock lock lever clockwise (facing
machine) to unlock tailstock from bedways.
2.
Slide tailstock to desired position by pushing
it along the bedways.
3.
Rotate tailstock lock lever counterclockwise
to lock tailstock against bedways.
Figure 34. Tailstock controls and features.
Offset Adjustment
Screw (1 of 2)
Quill
Tailstock Lock
Lever
Quill Lock
Lever
Quill
Handwheel
Using Quill
1. Rotate quill lock lever counterclockwise to
loosen quill.
2.
Turn quill handwheel clockwise to move quill
toward spindle or counterclockwise to move it
away from spindle.
3.
Rotate quill lock lever clockwise to secure
quill.
-38- Model G0768/G0769 (Mfd. Since 8/15)
To install tooling in tailstock:
1.
With tailstock locked in place, unlock quill,
then use handwheel to extend it approxi-
mately 1".
2.
Thoroughly clean and dry tapered mating
surfaces of quill and center, making sure no
lint or oil remains on tapers.
3.
With a firm and quick motion, insert tool into
quill. Check to see if it is firmly seated by
attempting to twist it—a firmly seated tool will
not twist.
4.
Unlock tailstock and move it until tip of tool
is close to, but not touching, workpiece, then
lock tailstock.
5.
Start spindle rotation, unlock quill lock lever,
then turn quill handwheel clockwise to feed
tool into workpiece.
Installing Tooling
Note: If the tooling has an open hole in the end,
then a screw can be threaded into the end of the
tool to provide a solid surface for the quill pin to
push against when the quill is retracted for tool
removal. Otherwise, removal of such tooling may
be difficult.
Offsetting Tailstock
The tailstock quill can be offset from the spin-
dle centerline for turning tapers. Offsetting quill
toward the front of the lathe results in a taper
at the tailstock end. Conversely, offsetting quill
toward the back of the lathe results in a taper at
the spindle end.
Removing Tooling
1. Use shop rag to hold tool.
2.
Rotate quill handwheel counterclockwise to
fully retract quill into tailstock until tool is
forced out of quill.
Figure 36. Example photos of inserting tools into
the tailstock.
Tang
Figure 35. Types of tapered arbors and tooling.
Screw
End
Solid
End
Open
End
Solid
End
Tang
The tailstock quill accepts MT#2 tapered arbors
(see the Figures below for examples).
Note: The marks on the offset indicator are arbi-
trary. For a precise offset, use a dial indicator to
check quill movement while adjusting the screws.
Figure 37. Left offset adjustment.
Offset
Indicator
Adjustment
Set Screw (1 of 2)
Model G0768/G0769 (Mfd. Since 8/15) -39-
Turn
CCW
Turn
CCW
Turn
CW
Turn
CW
Figure 38. Example of set screw adjustment in
relation to tailstock movement.
3. Tighten tailstock lock to secure the offset.
To offset tailstock:
1. Loosen tailstock lock to release clamping
pressure on top and bottom castings.
2. Rotate adjustment set screws in opposite
directions for desired offset (see below).
Tools Needed Qty
Hex Wrench 4mm .............................................. 1 Aligning Tailstock to Spindle
Centerline
Figure 39. Turning a dead center.
This is an essential adjustment that should be ver-
ified or performed each time the tailstock is used
to turn concentric workpieces between centers
or immediately after offsetting the tailstock when
turning a taper. If the tailstock is not aligned with
the spindle centerline when it is supposed to be,
turning results will be inaccurate along the length
of the workpiece.
Items Needed Qty
Hex Wrench 4mm .............................................. 1
Round Stock 2" x 6" .......................................... 2
To align tailstock to spindle centerline:
1. Center drill both ends of one piece of round
stock, then set it aside for use in Step 5.
2. Use another piece of round stock to make
a dead center, and turn it to a 60° point, as
illustrated below.
Note: As long as this dead center remains in the
chuck, the point of the center will remain true to
the spindle centerline. The point will have to be
refinished whenever the center is removed and
then returned to the chuck.
-40- Model G0768/G0769 (Mfd. Since 8/15)
Move tailstock toward
front of lathe 1/2 the
amount of taper.
Looking down from above.
Figure 41. Adjust tailstock toward the operator.
— If test stock is thinner at tailstock end,
move tailstock toward back of lathe 1⁄2
the
distance of taper amount, as shown below.
Looking down from above.
Move tailstock toward
back of lathe 1/2 the
amount of taper.
Figure 42. Adjust tailstock away from operator.
3. Install center in tailstock.
4. Attach a lathe dog to the test stock from Step
1, then mount it between centers, as shown
below.
8. Repeat Steps 5–7 until desired accuracy is
achieved.
Figure 40. Example of stock mounted between
the centers.
5. Turn 0.010" off stock diameter.
6. Mount a test or dial indicator so plunger is on
tailstock quill.
7. Use calipers to measure both ends of the
workpiece.
— If test stock is thicker at tailstock end,
move tailstock toward front of lathe 1⁄2 the
distance of the amount of taper, as shown
below.
Model G0768/G0769 (Mfd. Since 8/15) - 41-
Figure 43 shows the MT#2 and MT#3 dead cen-
ters included with the lathe.
Centers Mounting Dead Center in Spindle
1. DISCONNECT MACHINE FROM POWER!
2. Thoroughly clean and dry all mating surfaces
of spindle bore and center, making sure that
no lint or oil remains on these surfaces.
3. Mount chuck or faceplate onto spindle, which-
ever is correct for your operation.
4. Insert MT#3 center into spindle bore through
chuck or faceplate.
Below is an example photo of a dead center
installed in spindle, using a lathe dog and
faceplate for turning between centers.
Figure 43. Dead centers.
MT#2 Dead
Center
MT#3 Dead
Center
Dead Centers
Dead centers are one-piece, high-speed steel
centers that require low spindle speeds and a
small amount of oil to reduce friction heat that may
damage the workpiece.
Mount the MT#2 dead center (see Figure 43)
in the tailstock. Since the workpiece will rotate
against the center and generate friction, the tip of
the center must be lubricated to avoid premature
wear and maximize smooth operation.
Mount the MT#3 dead center (see Figure 43) in
the spindle for operations where the workpiece
rotates with the center and does not generate
friction.
Figure 44. Example of using a dead center with
a faceplate and lathe dog.
Dead Center
Lathe
Dog
Removing Center from Spindle
To remove the center from the spindle, insert a
piece of round bar stock (or similar tool) through
the outside end of the spindle. Hold onto the cen-
ter with a gloved hand or shop rag, then tap the
bar stock to knock the center loose.
-42- Model G0768/G0769 (Mfd. Since 8/15)
Mounting Center in Tailstock
To mount center in tailstock:
1.
DISCONNECT MACHINE FROM POWER!
2.
Thoroughly clean and dry tapered mating
surfaces of tailstock quill bore and center,
making sure no lint or oil remains on tapers.
Removing Center from Tailstock
Note: The maximum quill travel is 2", but
we do not recommend extending the quill
more than 1" or stability and accuracy will be
reduced.
3. Use quill handwheel to feed quill out from
casting approximately 1".
4. Insert center into tailstock quill.
5.
Seat center firmly into quill during workpiece
installation by rotating quill handwheel clock-
wise to apply pressure with center engaged
in center hole of workpiece.
Note: Only apply enough pressure with
tailstock quill to securely mount workpiece
between centers. Avoid overtightening cen-
ter against workpiece, or it may become
difficult to remove later, and it will result in
excessive friction and heat, which may dam-
age workpiece and center.
To remove the center from the quill, hold onto it
with a gloved hand or shop rag, then rotate the
quill handwheel counterclockwise to draw the quill
back into the casting until the center releases.
If the center does not come loose by retracting the
quill, extend the quill to expose the slot shown in
the Figure below, then use a drift key to remove
the center.
The included #2 dead center or a live center (not
included) can be used in the tailstock. Mounting
instructions are the same for both. The Figure
below shows an example photo of a dead center
mounted in a tailstock.
Figure 45. Example of using dead center
installed in the tailstock.
Dead Center
Mounting Workpiece Between
Centers
To avoid premature wear of dead center
or damage to workpiece, use low spindle
speeds and keep tip of dead center mounted
in tailstock well lubricated.
1. DISCONNECT LATHE FROM POWER!
2. Drill center holes in both ends of workpiece.
3. Install dead center in spindle with lathe dog
and chuck, faceplate or drive plate, then
install live center or carbide-tipped dead cen-
ter in tailstock.
4. Lubricate dead center point and workpiece
center holes, then mount workpiece between
centers and hold it in place with light pressure
from tailstock center.
5. Seat center firmly into quill by rotating quill
handwheel clockwise to apply pressure
against workpiece (see example below).
Figure 46. Example photo of a workpiece
mounted between two centers.
Note: Only apply enough pressure to securely
mount the workpiece between centers. Avoid
over-tightening the center against the workpiece,
or it may become difficult to remove later. Also,
over-tightening will result in excessive friction and
heat, which may damage the workpiece or center.
1. DISCONNECT MACHINE FROM POWER!
2. Drill center holes in both ends of workpiece.
3. Install MT#3 dead center in spindle with lathe
dog and chuck or faceplate, then install live
center or MT#2 dead center in tailstock.
4. Lubricate MT#2 dead center point and
workpiece center holes, then mount workpiece
between centers and hold it in place with light
pressure from tailstock center.
Model G0768/G0769 (Mfd. Since 8/15) -43-
Steady Rest
Follow Rest
The follow rest mounts to the saddle and supports
the workpiece near the cutting tool to prevent
deflection
from the pressure of the cutting tool.
The
follow rest fingers adjust in the same manner
as the fingers on the steady rest.
Tip: To reduce the effects of friction, lubricate the
finger tips with generous amounts of anti-sieze
lubricant during operation.
Tool Needed Qty
Hex Wrench 4mm .............................................. 1
Figure 48. Follow rest attachment.
Cap
Screws
The steady rest supports long shafts and can
be
mounted anywhere along the length of the
bedway
. Familiarize yourself with the steady rest
components shown below
to better understand
the controls before using it.
Finger
Finger
Adjustment
Knob
To install and use steady rest:
1. DISCONNECT MACHINE FROM POWER!
2. Thoroughly clean all mating surfaces.
3. Place steady rest base on bedways and
secure with clamp plate, hex bolt, and lock
nut.
4. Loosen finger lock nuts (see Figure 47), turn
finger adjustment knobs, and adjust fingers
as required for workpiece.
5. Loosen steady rest lock nut, position steady
rest where required to properly support
workpiece, then secure lock nut.
6. Turn finger adjustment knobs so fingers are
barely touching workpiece, then tighten finger
lock nuts.
Tools Needed for Installation/Removal Qty
Open-End Wrench 13mm .................................. 1
Open-End Wrench 14mm .................................. 1
Figure 47. Steady rest components.
Finger
Lock Nut
Lock
Nut
Clamp
Plate
7. Lubricate finger tips with an anti-seize lubri-
cant during operation. Note: Mill or file the
tips if they show wear.
Finger
Adjustment
Knob
-44- Model G0768/G0769 (Mfd. Since 8/15)
2. Rotate rest to desired angle, as indicated by
scale at base, then retighten cap screws.
Tip: The first time you set the compound rest
angle for cutting threads, mark the location
on the cross slide as a quick reference point.
This will allow you to quickly return the com-
pound rest to that exact angle the next time
you need to cut threads.
The compound rest handwheel has an indirect-
read graduated scale. This means that the dis-
tance shown on the scale represents the actual
distance the cutting tool moves. The base of the
compound rest has another graduated scale used
for setting the cutting tool to a specific angle.
Graduated Dial
Increments ............................... 0.001" (0.025mm)
One Full Revolution ..................... 0.05" (1.27mm)
Tool Needed Qty
Hex Wrench 4mm .............................................. 1
To set compound rest angle:
1. Loosen cap screws shown in Figure 49.
Compound Rest Four-Way Tool Post
Tool Needed Qty
Tool Post T-Wrench ........................................... 1
Installing Tool
The four-way tool post is mounted on top of the
compound rest
and allows a maximum of four
tools
to be loaded simultaneously.
Each tool can be quickly indexed to the workpiece
by
loosening the top handle, rotating the tool
post to the desired position, then retightening the
handle to lock the tool into position.
To install tool in tool post:
1
. Adjust tool post bolts so cutting tool can fit
underneath them (see below).
Figure 50. Example of tool mounted in tool post.
Cutting
Tool
Tool Post
Bolt
2. Firmly secure cutting tool with at least two
tool post bolts.
3.
Check and adjust cutting tool to spindle cen-
terline, as instructed in next subsection.
Over-extending a cutting tool from the post
will increase risk of tool chatter, breakage,
or tool loosening during operation, which
could cause metal pieces to be thrown at
the operator or bystanders with great force.
DO NOT extend a cutting tool more than 2.5
times the width of its cross-section (e.g.,
2.5 x 0.5" = 1.25").
Figure 49. Compound rest angle adjustments.
Cap
Screws Angle
Scale
Model G0768/G0769 (Mfd. Since 8/15) -45-
Aligning Cutting Tool with Spindle
Centerline
For most operations, the cutting tool tip should be
aligned with the
spindle
centerline, as illustrated
below.
There are a number of ways to check and align
the cutting tool to the spindle centerline. If nec-
essary, you can raise the cutting tool by placing
steel shims underneath it. The shims should be
as long and as wide as the cutting tool to properly
support it.
Below are two common methods:
• Move the tailstock center over the cross slide
and use a fine ruler
to measure the distance
from the surface of the cross slide to the tip
of the center. Adjust the
cutting tool height so
it is the same distance above the cross slide
as the tailstock center.
•
Align the tip of the cutting tool with a
tailstock
center, as instructed in the following pro-
cedure. For this to work, the tailstock must
be aligned to the spindle centerline (refer to
Aligning Tailstock To Spindle Centerline
in this manual for detailed instructions).
Cutting
Tool
Spindle
Center
Line
Figure 51. Cutting tool aligned with spindle
centerline (viewed from tailstock).
Tools Needed Qty
Tool Post T-Wrench ........................................... 1
Steel Shims ....................................... As Needed
Cutting Tool ....................................................... 1
Tailstock Center ................................................. 1
To align cutting tool with tailstock center:
1.
Mount cutting tool in tool post, then secure
post so tool faces tailstock.
2.
Install center in tailstock, and position center
tip near cutting tool tip.
3.
Lock tailstock and quill in place.
4.
Adjust height of cutting tool so tool tip is
aligned vertically with center tip, as illustrated
below.
Cutting
Tool Tailstock
Center
(Side View)
Figure 52. Cutting tool aligned to the tailstock
center.
Cutting
Tool
Tailstock
Center
(Top View)
-46- Model G0768/G0769 (Mfd. Since 8/15)
The cutting tool can be manually fed into the
workpiece using the carriage, cross slide, and
compound rest handwheels shown below.
Carriage Handwheel
Graduated Dial
Increments ................................... 0.01" (0.25mm)
One Full Revolution .......................... 1" (25.4mm)
Use the carriage handwheel to move the carriage
left or right along the bed. Adjust the position of
the graduated scale by holding the handwheel
with one hand and turning the dial with the other.
Figure 53. Manual feeding controls.
Carriage
Handwheel
Manual Feed
Cross Slide
Handwheel
Compound
Rest
Handwheel Cross Slide Handwheel
Graduated Dial
Increments .................................0.002" (0.05mm)
One Full Revolution .....................0.08" (2.03mm)
Use this handwheel to move the tool toward and
away from the work. The cross slide handwheel
has a direct-read graduated dial, which shows the
total amount of material removed from the diam-
eter of the workpiece.
Compound Rest Handwheel
Graduated Dial
Increments .............................. 0.001" (0.025mm)
One Full Revolution ..................... 0.05" (1.27mm)
Use this handwheel to move the cutting tool lin-
early along the set angle of the compound rest.
Set the compound rest angle by hand-rotating
it and securing it with the two cap screws (see
Figure 49 on Page 44). The compound rest has
an indirect-read graduated dial.
Model G0768/G0769 (Mfd. Since 8/15) -47-
Setting Spindle Direction & Speed
Set the spindle rotation direction to forward or
reverse with the spindle direction switch, shown
in Figure 56. Reset the Emergency Stop button,
press the ON button, select "1" on the lathe/mill
selector (Model G0769 only) then turn the spindle
speed dial clockwise until the desired spindle
speed displays on the spindle speed RPM display.
Spindle Speed
Using the correct spindle speed is important for
getting
safe and satisfactory results, as well as
maximizing tool life.
To set the spindle speed for your operation, you
will need to: 1) Determine the
best
spindle speed
for the cutting task, and 2)
Configure the
lathe
controls to produce the required spindle speed.
Cutting Speed (FPM) x 12
*Recommended
Dia. of Cut (in inches) x 3.14
Spindle
Speed
(RPM)
*Double if using carbide cutting tool
=
Figure 54. Spindle speed formula for lathes.
Determining Spindle Speed
Many variables affect the optimum spindle speed
to use for any given operation
, but the two most
important are the recommended cutting speed for
the workpiece material and the diameter of the
workpiece, as noted in the formula shown below.
Cutting speed, typically defined in feet per minute
(FPM), is the speed at which the edge of a tool
moves across the material surface.
A recommended cutting speed is an ideal speed
for cutting a
type of material in order to produce
the desired finish and optimize tool life.
The books
Machinery’s Handbook or
Machine
Shop Practice
, and some internet sites, pro-
vide excellent recommendations for which cutting
speeds to use when calculating the spindle speed.
The
se sources
also provide a wealth of additional
information about the variables that affect cutting
speed and
they are a good educational resource.
A
lso, there are a large number of easy-to-use
spindle speed calculators that can be found on
the internet.
These sources will help you
take into
account the applicable variables in order to deter-
mine the best spindle speed for the operation.
Setting Spindle Speed Range
One of two spindle speed ranges is selected by
repositioning the top V-belt between the spindle
and idler pulleys (see Figure 55). Select the A
position for low (50-1000 RPM) or B position for
high (100–2000 RPM) speed ranges. The V-belt
diagram below is also found on the headstock.
Tools Needed Qty
Hex Wrench 4mm .............................................. 1
Figure 55. Belt positioned for low speed.
AB
M
Low High
Spindle
Pulley
Motor
Pulley
Idler
Pulley
Top
V-Belt
Figure 56. Spindle speed and direction controls.
Spindle
Direction
Switch
Lathe/Mill Selector
Switch (G0769 Only)
Emergency
Stop
Button
Spindle
Speed RPM
Display
Spindle
Speed Dial
-48- Model G0768/G0769 (Mfd. Since 8/15)
Tensioner
Screw
Figure 57. Location of tensioner screw used for
tightening/loosening V-belts when changing belt
positions.
Configuration Example
Follow this example to gain a better understand-
ing of how to set the lathe spindle speed.
To set spindle speed to 100 RPM:
1. DISCONNECT MACHINE FROM POWER!
2. Open end cover.
3. Loosen tensioner screw (see Figure 57) to
loosen V-belt tension.
4. Move top V-belt to A position (see Figure 58)
to select low speed range (50–1000 RPM).
5. Re-tension V-belt (refer to "Tensioning
V-Belts" on Page 81).
6. Re-install end cover.
7. Reset Emergency Stop button.
8. Rotate spindle direction switch to "F" or "R",
and press ON button.
9. Rotate spindle speed dial clockwise until
spindle speed display reads 100 RPM.
Figure 58. V-belt positioned in low speed range.
AB
M
Low High
Top
V-Belt
Model G0768/G0769 (Mfd. Since 8/15) -49-
Thread Charts—Display headstock end gear
positions used for cutting various metric or inch
threads (see Figure 61).
Understanding Gear
Charts
This subsection explains how to understand the
feed and thread charts on the headstock. If you do
not understand lathe gear charts, or need a quick
refresher, read this before configuring the end
gears for power feeding or threading operations.
0.0071"
0.0037"
84
20
A
A
40
in/
mm
n/1"
C
C
DD
BB
E
E
F
A
C D
B
E F
A
C D
B
E F
F
80 80
0.40
1.25 1.50 1.75 2.00 2.50 3.00
55
80
80
53
71 71 63
57
71 7163 33 30 60 40 40
506084805060
20
80 80
80 63 63
80
60 70
70
70
57 72 80
80
30 33 53 30 60 40 40 4030 3370
0.50 0.60 0.70 0.80 1.00
80
30 72
33 80
30
0.0068"
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
Figure 60. Feed chart.
Feed Chart—Displays headstock end gear posi-
tions for different speeds of automatic feed (power
feed) used with turning operations (see Figure
60).
Figure 59. Feed and thread charts label.
Feed & Thread Charts Label
The feed and thread charts label (see Figure 59)
provides information for setting up end gears for
threading or non-threading operations. The top
displays a feed chart, the bottom displays metric
and inch thread charts.
Feed & Thread
Charts Label
Feed Chart
Thread
Charts
Figure 61. Threading charts.
0.0071"
0.0037"
84
20
A
A
40
in/
mm
n/1"
C
C
DD
BB
E
E
F
A
C D
B
E F
A
C D
B
E F
F
80 80
0.40
1.25 1.50 1.75 2.00 2.50 3.00
55
80
80
53
71 71 63
57
71 7163 33 30 60 40 40
506084805060
20
80 80
80 63 63
80
60 70
70
70
57 72 80
80
30 33 53 30 60 40 40 4030 3370
0.50 0.60 0.70 0.80 1.00
80
30 72
33 80
30
0.0068"
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
Metric
Thread Chart
Inch Thread
Chart
-50- Model G0768/G0769 (Mfd. Since 8/15)
Figure 62 identifies the three available feed rates
and the feed icon at the top of the feed rate chart.
How to Read the Feed Chart
0.0071"
0.0037"
84
20
A
A
40
in/
C
C
DD
BB
E
E
FF
80 80
80
30 72
33 80
30
0.0068"
Figure 62. Chart displays the three feed rates.
Feed Rates Feed Rate
Icon
Both positions must be filled for the gears to work
properly. This also applies to "blank" areas on the
chart, such as the one right of the 80T (E) gear
in Figure 64 (the dashed box is used for identifi-
cation only). A spacer should be installed in this
position on the shaft. A spacer is not listed on
the chart because the chart only reflects ACTIVE
gear positions.
The lines shown between the numbers in Figure
65 identify which gears mesh.
Each shaft has room to mount gears in two posi-
tions—forward and rear (see Figure 64).
0.0071"
0.0037"
84
20
A
A
40
in/
C
C
DD
BB
E
E
FF
80 80
80
30 72
33 80
30
0.0068"
Figure 64. Forward and rear gear positions.
Forward
Rear
Blank Area Indicates
Spacer (Not Shown)
0.0071"
0.0037"
84
20
A
A
40
in/
C
C
D
D
B
B
E
E
FF
80 80
80
30 72
33 80
30
0.0068"
Figure 65. Lines indicate which gears mesh.
Gear Mesh
Lines
For example, to set the feed rate for 0.0037 in./
rev., mesh the 30T (B) gear with the 80T (D) gear,
and mesh the 20T (C) gear with the 80T (E) gear.
Figure 63 identifies the end gears on the upper,
middle, and lower shafts, and the 40-tooth (40T)
spindle gear. The gears are represented by letters
in the columns and the diagram.
0.0071"
0.0037"
84
20
A
A
40
in/
C
C
DD
BB
E
E
FF
80 80
80
30 72
33 80
30
0.0068"
Figure 63. Identification of upper, middle and
lower shaft gears.
Upper
Shaft
Gears
Lower Shaft Gears
Middle Shaft Gears
Spindle
Gear
Columns
Model G0768/G0769 (Mfd. Since 8/15) -51-
Because there is only one spacer, on some
setups smaller gears must be used as spac-
ers on the adjustable gears.
Both positions must be filled for the gears to work
properly. This also applies to the "blank" areas on
the chart, such as the one left of the 50T (F) gear
shown in Figure 69. A spacer should be installed
in this position on the shaft. A spacer is not listed
because chart only reflects ACTIVE gear posi-
tions.
Figure 68 identifies the end gears on the upper,
middle, and lower shafts. The gears are repre-
sented by letters.
Upper Shaft Gears
Figure 68. Identification of gears on shafts.
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24
32 40 44
80 80
30 33 40
65 70 80 60
6060 60 63
63
53
910 11 12
13 14 16 18
50 50 55
80
80
80 80 80
80 60
60
71 53 55
33 3055 5540 30
53 53 53
72 63 70
57 57
72 72
7272 80 70
40 40 40
63 57
55
Lower Shaft Gears
Middle Shaft Gears
Upper Shaft Gears
The shaded boxes in Figure 67 show the threads
per inch (TPI) on the applicable chart.
Each shaft has room to mount gears in two posi-
tions—forward and rear (see Figure 69).
Figure 66 identifies the charts to use when set-
ting carriage feed movement for metric or inch
threading.
mm
n/1"
A
C D
B
E F
A
C D
B
E F
0.40
1.25 1.50 1.75 2.00 2.50 3.00
55
80
80
53
71 71 63
57
71 7163 33 30 60 40 40
506084805060
20
80 80
80 63 63
80
60 70
70
70
57 72 80
80
30 33 53 30 60 40 40 4030 3370
0.50 0.60 0.70 0.80 1.00
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
Figure 66. Icons indicate inch or metric threads.
How to Read the Thread Charts
Inch Icon
Indicating
Threads per
Inch (TPI)
Metric Icon
Indicating
Thread Pitch
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
Figure 67. Numbers in shaded boxes indicate
the TPI or threads per inch.
Threads
Per Inch
(TPI)
Forward
Gears Rear
Gears
Spacer
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
Figure 69. Identification of forward and rear gear
positions.
Forward
Blank Area Indicates
Spacer (Not Shown)
Rear
-52- Model G0768/G0769 (Mfd. Since 6/14)
Primary Threading Configuration
This threading configuration is used for inch and
metric threading. Mesh the A and C, and D and F
gears, as shown in Figure 72. The A/B and C/D
change gears each share a keyed bushing. A
spacer (E) is installed on the lower shaft in front
of the F gear.
Secondary Threading Configuration
This threading configuration is used for a differ-
ent range of inch threads. Mesh the A, C, and E
gears, as shown in Figure 73. The A/B, and C/D
gears each share a keyed bushing. The B and D
gears (e.g. 20T or 30T) function as spacers since
they do not mesh with other gears. A spacer (F)
is installed on the lower shaft behind the E gear.
Figure 73. Secondary threading configuration.
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80
80
30 33 40 65 70 80 60
6060 60 63
63
53
9
10 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
E Gear
A Gear
B Gear
C Gear
D Gear
F (Spacer)
This section explains how to configure end gears
for power feeding and threading operations.
End Gears
Power Feed Configuration
The end gears are preset by the factory in this
configuration, which is used for power feeding.
Mesh the B and D gears and the C and E gears
(see Figure 71). A spacer (F) is installed on the
lower shaft behind the E gear.
Figure 71. Power feed change gear
configuration.
0.0071"
0.0037"
84
20
A
A
40
C
C
D
D
B
B
E
E
F
F
80
80
80
30
72
33 80
30
0.0068"
E Gear
F (Spacer)
D Gear
C Gear
B Gear
A Gear
Figure 72. Primary threading configuration.
A
C D
B
E F
A
C D
B
E F
30
19
20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50
50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53
53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
A Gear
E (Spacer)
F Gear
B Gear
C Gear
D Gear
The lines shown between the numbers in Figure
70 indicate which gears should be in mesh.
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30
33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57
57 72 72
72
72 80
70 40 40 40
63 57
55
Figure 70. Lines between numbers indicate
gears that should be in mesh.
Gear Mesh
Lines
For example, to set the lathe to cut 9 TPI (threads
per inch), mesh the 80T (C) gear with the 53T (A)
and 30T (E) gears.
Model G0768/G0769 (Mfd. Since 6/14) -53-
Configuring End Gears
Follow the example below to understand how
to change the gears from the factory set power
feed configuration to the primary inch threading
configuration. Concepts are similar to those for
setting up gears for power feeding.
Note: Many of the techniques and concepts
explained here also apply to setting up gears for
power feeding.
Tools Needed Qty
Hex Wrench 5mm .........................................1 Ea
Open-End Wrenches 6, 14, 17mm ...............1 Ea
Punch ................................................................ 1
Hammer ............................................................. 1
5. Loosen adjuster cap screw shown in Figure
75, and pivot adjuster down to disengage
gears.
6. Remove hex nuts, e-clips, and flat washer
that secure gears (see Figure 75).
7. Loosen top and bottom gear shafts to make it
easier to remove gears in following steps.
8. Slide 80T and 84T gears off shafts, then
remove middle C/D (20T/80T) gear and shaft
(see Figure 76).
Figure 75. Adjuster cap screw location.
To configure end gears for 20 TPI:
1. DISCONNECT MACHINE FROM POWER!
2. Locate 20 TPI on thread chart shown in
Figure 74.
3. Gather 53T, 80T, 60T, and 50T gears. (The
80T gear may already be installed.)
4. Remove end gear cover.
Figure 74. Gear positions for 20 TPI on thread
chart.
0.0071"
0.0037"
84
20
A
A
40
in/
mm
n/1"
C
C
DD
BB
E
E
F
A
C D
B
E F
A
C D
B
E F
F
80 80
0.40
1.25 1.50 1.75 2.00 2.50 3.00
55
80
80
53
71 71 63
57
71 7163 33 30 60 40 40
506084805060
20
80 80
80 63 63
80
60 70
70
70
57 72 80
80
30 33 53 30 60 40 40 4030 3370
0.50 0.60 0.70 0.80 1.00
80
30 72
33 80
30
0.0068"
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
20 TPI
Figure 76. Gear removal identification.
84T Gear20T/80T Gear
80T Gear
Tip: Hold middle shaft T-nut in adjuster while
removing 20T/80T gear so T-nut does not fall off.
Gear
Shafts
Hex Nut &
E-Clips
Hex Nut &
Flat Washer
Adjuster
Adjuster Cap
Screw
Gears and Positions Needed
-54- Model G0768/G0769 (Mfd. Since 8/15)
12. Remove 20T gear with keyed bushing from
80T gear (see Figure 80).
Figure 80. 20T gear removed from 80T gear.
80T Gear
10. Slide 50T gear onto lower shaft with hub
facing in, re-install keyed spacer and flat
washer, then thread on hex nut finger-tight,
for now (see Figure 78).
9. Remove keyed spacer from lower gear shaft
(see Figure 77).
Figure 78. 50T gear installed on lower shaft.
50T GearFlat Washer
Hex Nut
11. Remove gear shaft from middle C/D (20T/80T)
gear (see Figure 79).
Figure 79. Shaft removed from 20T/80T gear.
Shaft
13. Remove keyed bushing from 20T gear.
14. Connect 80T and 60T gear with keyed bush-
ing, as shown in Figure 81. The 80T gear
hub faces out; the 60T gear hub faces the
80T gear.
Figure 81. 80T and 60T gears connected.
80T Gear
60T Gear Hub
Front View Rear View
Bushing
15. Put dab of NLGI #2 grease onto 80T/60T
gear shaft, then insert longer end of shaft into
gear (see Figure 82).
Figure 82. Shaft installed into 80T/60T gears.
Shaft
Figure 77. Location of keyed spacer.
Keyed
Spacer
Shaft
Keyed Spacer
Keyed Bushing
20T Gear
Model G0768/G0769 (Mfd. Since 8/15) -55-
16. Thread short end of 80T/60 gear shaft into
T-nut on adjuster until finger tight (see Figure
83).
Figure 83. 80T/60T gear threaded onto T-nut.
20. Re-install e-clips and hex nuts onto middle
and top gear shafts.
21. Adjust lash between meshed gears so it
is approximately 0.003", then tighten gear
shafts and fasteners.
22. Swing adjuster up and mesh 53T gear with
40T spindle gear (see Figure 86).
T-Nut
23. Secure adjuster cap screw.
24. Re-install end gear cover. The end gears are
now configured for 20 TPI.
Figure 86. 53T gear meshed with spindle gear.
Adjustor Cap
Screw
17. Remove 30T gear with keyed bushing from
84T gear.
18. Install 30T gear with keyed bushing onto 53T
gear (see Figure 84). Hub of 53T gear should
face 30T gear.
Figure 85. 53T/30T gear installed on upper
shaft.
53T/30T Gear
19. Put a dab of grease on upper shaft, then slide
53T/30T gear on, as shown in Figure 85.
Figure 84. 53T/30T gears assembled.
Keyed
Bushing
30T Gear
53T Gear
Spindle Gear
53T Gear
-56- Model G0768/G0769 (Mfd. Since 8/15)
Power Feed
The carriage has power feed (or automatic feed)
options for threading or non-threading operations.
This section describes how to use the power feed
option for non-threading operations. To learn how
to power the carriage for threading operations,
refer to Threading on Page 58.
Power Feed Controls
Use the following descriptions and figures to
understand the power feed controls.
Before using power feed, you may have to recon-
figure the end gears, depending on how they are
set up (refer to Power Feed Configuration on
Page 52). The lathe comes from the factory with
the end gears set up in the power feed configura-
tion.
A. Spindle Direction Switch: Enables forward
or reverse carriage travel when feed direction
dial and half nut lever are engaged. The car-
riage will not move when the switch is in the
"0" position.
Figure 87. Spindle switch and feed rate chart.
A
B
To avoid damaging lathe, NEVER allow
cutting tool to run into chuck! ALWAYS
make sure spindle is completely stopped
BEFORE using headstock controls to make
changes.
C. Feed Direction Dial: Selects carriage travel
direction without changing direction of head-
stock rotation. The carriage moves left when
feed direction dial is turned right, half nut
lever is engaged, and spindle direction switch
is set to "F".
The carriage moves right when the feed
direction dial is turned to the left. The carriage
will not move when the lever is in the center
position.
Carriage travel direction reverses when the
spindle direction switch is set to "R".
Figure 89. Feed direction dial.
C
B. Feed Rate Chart: Displays end gear settings
for selected feed rate (see Figure 88).
0.0071"
0.0037"
84
20
A
A
40
in/
mm
n/1"
C
C
DD
BB
E
E
F
A
C D
B
E F
A
C D
B
E F
F
80 80
0.40
1.25 1.50 1.75 2.00 2.50 3.00
55
80
80
53
71 71 63
57
71 7163 33 30 60 40 40
506084805060
20
80 80
80 63 63
80
60 70
70
70
57 72 80
80
30 33 53 30 60 40 40 4030 3370
0.50 0.60 0.70 0.80 1.00
80
30 72
33 80
30
0.0068"
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
Figure 88. Feed chart.
Model G0768/G0769 (Mfd. Since 8/15) -57-
To avoid potential carriage/chuck crash,
disengage half nut lever immediately after
completing power feed operations.
D. Half Nut Lever: Engages/disengages half
nut for power feed operations.
Figure 90. Half nut lever.
D
3. Gather the required A–F change gears: 84T,
30T, 20T and two 80T gears, based upon the
chart in Figure 91.
4. Remove end cover.
5. Loosen adjuster cap screw shown in Figure
92, and pivot adjuster down to disengage
gears.
6. Remove hex nuts, e-clips, and flat washers
that secure existing gears.
7. Replace A/B gear with 84T and 30T gears,
replace C/D gear with 20T and 80T gears,
and install spacer with 80T gear on bottom
shaft (see Figure 93).
Figure 92. Adjustor cap screw location.
Adjustor Cap
Screw
Follow the example below to better understand
how to set the lathe power feed.
Tools Needed:
Hex Wrenches 4, 5mm .................................1 Ea
Open-End Wrenches 13, 14mm ...................1 Ea
To set power feed rate to 0.0037 in/rev.:
1. DISCONNECT MACHINE FROM POWER!
2. Locate the 0.0037 in./rev. column heading on
the feed rate chart, as shown in Figure 91.
Setting Power Feed Rate
Figure 91. Change gears for 0.0037 in./rev. on
feed chart.
0.0071"
0.0037"
84
20
A
A
40
in/
mm
n/1"
C
C
DD
BB
E
E
F
A
C D
B
E F
A
C D
B
E F
F
80 80
0.40
1.25 1.50 1.75 2.00 2.50 3.00
55
80
80
53
71 71 63
57
71 7163 33 30 60 40 40
506084805060
20
80 80
80 63 63
80
60 70
70
70
57 72 80
80
30 33 53 30 60 40 40 4030 3370
0.50 0.60 0.70 0.80 1.00
80
30 72
33 80
30
0.0068"
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
0.0037 in./rev.
Change
Gears
Figure 93. Power feed change gear
configuration.
0.0071"
0.0037"
84
20
A
A
40
C
C
D
D
B
B
E
E
F
F
80
80
80
30
72
33 80
30
0.0068"
E Gear
F (Spacer)
D Gear
C Gear
B Gear
A Gear
-58- Model G0768/G0769 (Mfd. Since 8/15)
The following subsections describe how to use
the threading controls and charts to set up the
lathe for a threading operation. If you are unfamil-
iar with how to cut threads on a lathe, we strongly
recommend that you read books, review industry
trade magazines, or get formal training before
attempting any threading projects.
Headstock Threading Controls
The threading chart on the headstock face dis-
plays the settings for inch and metric threading.
Using the controls on the lathe, follow the exam-
ple below to understand how to set up the lathe
for the desired threading operation.
Threading
To set lathe to thread 20 TPI right-hand
threads:
1. Configure gears as instructed in End Gear
Configuration Example on Page 53.
2. Place the top V-belt in the A position for low
(50-1000 RPM), as shown in Figure 94.
8. Adjust lash between meshed gears so it is
approximately 0.003", then tighten the gear
shafts.
9. Swing the adjuster up and mesh the 84T gear
with the spindle gear.
10. Secure the adjuster cap screw.
11. Re-install end gear cover. The lathe is now
set for a power feed rate of 0.0037 in./rev.
Feed Direction Dial
LEFT
(For LH threads)
RIGHT
(for RH threads)
CENTER
(Neutral)
Figure 95. Feed direction dial setting.
Feed
Direction
Lever
3. Move the feed direction dial to the right (see
Figure 95). The lathe is now set up to cut 20
TPI threads.
Figure 94. Top V-belt in "A" position.
AB
M
Low High
Top
V-Belt
Model G0768/G0769 (Mfd. Since 8/15) -59-
Thread Dial Chart
INDICATOR TABLE
9 1-8
1-8
1-8
1-8
1, 4, 7
12
18
24
All Others
TPI SCALE
Figure 97. Thread dial chart.
The thread dial chart is located on the headstock,
as shown in Figure 96.
Find the TPI (threads per inch) that you want to
cut on the thread dial chart (see Figure 97), then
reference the scale number to the right. The scale
numbers indicate when to engage the half nut for
a specific thread pitch as indicated by the thread
dial.
7
1
3
5
Thread Dial
TPI Dial Number
1, 4, 7
10, 11, 13, 14, 16,
19, 20, 22, 32, 40, 44
Figure 99. Dial positions for other TPI.
All Other TPI: Use lines 1, 4 or 7 (see example
in Figure 99).
The following examples explain how to use
thread dial and thread dial chart.
TPI Divisible by 3: Use any line on the thread dial
(see example in Figure 98).
7
1
3
5
Thread Dial
TPI Dial Number
9, 12, 18, 24 1–8
Figure 98. Dial positions for threading TPI
divisible by 3.
When threading, use slowest speed pos-
sible and avoid deep cuts, so you are able to
disengage half nut when required to prevent
a carriage crash!
When the first cutting pass is complete, the opera-
tor disengages the carriage from the leadscrew
using the half nut lever. The operator returns the
carriage for the next pass and re-engages the half
nut using the same thread dial setting to resume
the cut in the previous pass.
Apron Threading Controls
The half nut lever engages the carriage with the
leadscrew, which moves the carriage and cutting
tool along the length of the workpiece for thread-
ing operations (see Figure 96).
The numbers on the thread dial (Figure 96) are
used with the thread dial chart to show when to
engage the half nut during inch threading.
Note: The thread dial is not used for metric
threading. For that type of operation, you must
leave the half nut engaged from the beginning
until turning is complete.
Thread Dial
Figure 96. Apron threading controls.
Half Nut
Lever
Thread Dial
Thread Dial
Chart
Engaged
Half Nut
Lever
Disengaged
-60- Model G0768/G0769 (Mfd. Since 8/15)
SECTION 5: MILL OPERATIONS
To complete a typical milling operation, the
operator does the following:
1. Puts on personal protective equipment.
2. Securely clamps workpiece to cross slide
table.
3. With machine disconnected from power,
installs correct tooling.
4. Adjusts mill headstock height.
5. Selects correct gear setting on milling head-
stock gearbox for desired speed range.
6. Connects machine to power.
7. Rotates spindle speed dial to lowest setting,
and resets Emergency Stop button.
8. Presses ON button, turns spindle direction
switch to "F", and rotates spindle speed dial
to correct spindle speed.
9. Uses spindle downfeed and table controls to
perform operation.
10. Presses Emergency Stop button and waits
for spindle to completely stop before remov-
ing workpiece, changing tooling, or changing
spindle speeds.
Operation Overview
The purpose of this overview is to provide the nov-
ice machine operator with a basic understanding
of how the machine is used during operation, so
the
machine controls/components
discussed later
in this manual
are easier to understand.
Due to the generic nature of this overview, it is
not intended to be an instructional guide. To learn
more about specific operations, read this entire
manual and
seek additional training from expe-
rienced
machine operators, and do additional
research outside of this manual by reading "how-
to" books, trade magazines, or websites.
To reduce your risk of
serious injury, read this
entire manual BEFORE
using machine.
If you are not experienced with this type
of machine, WE STRONGLY RECOMMEND
that you seek additional training outside of
this manual. Read books/magazines or get
formal training before beginning any proj-
ects. Regardless of the content in this sec-
tion, Grizzly Industrial will not be held liable
for accidents caused by lack of training.
To reduce risk of eye or face injury from
flying chips, always wear approved safety
glasses and face shield when operating this
machine.
To reduce risk of injury and increase
longevity of machine, always start spindle
rotation with spindle speed dial set to low-
est setting.
Model G0768/G0769 (Mfd. Since 8/15) -61-
Removing
Compound Rest
The compound rest and tool post must be removed
before milling/drilling so the cross slide table can
be used as the milling table.
Re-installing Compound Rest
Align compound rest with swivel base mounting
holes and nut (see Figure 101), then secure with
cap screws previously removed.
Note: While re-installing compound rest, use a
3mm hex wrench to press swivel base up from
underneath and keep it from sliding back down
into cross slide.
Figure 101. Swivel base components.
Mounting
Holes
Nut
Tools Needed Qty
Hex Wrench 3mm .............................................. 1
Hex Wrench 4mm .............................................. 1
Removing Compound Rest
Remove the two cap screws that secure com-
pound rest (see Figure 100), then remove it.
Figure 100. Location of compound rest cap
screws.
Cap Screws
-62- Model G0768/G0769 (Mfd. Since 8/15)
Headstock
Movement
The milling headstock moves in the following
ways:
• Travels up and down the column (Z-axis).
• Tilts 45° left or right relative to the table.
Tilting Headstock
Tools Needed Qty
Wrench 16mm ................................................... 1
Wrench 14mm ................................................... 1
To tilt headstock:
1. DISCONNECT MACHINE FROM POWER!
2. Support headstock with one hand, then loos-
en headstock center bolt and angle lock nut
(see Figure 104).
Raising/Lowering Headstock
1. DISCONNECT MACHINE FROM POWER!
2. Loosen both Z-axis lock levers shown in
Figure 102.
Figure 102. Location of Z-Axis lock levers.
3. Use vertical handwheel shown in Figure 103
to adjust headstock height.
4. Retighten lock levers.
Figure 103. Location of Z-Axis handwheel.
Vertical
Handwheel
3. While viewing tilt scale, rotate headstock to
required angle, then retighten center bolt and
angle lock nut to secure headstock.
Figure 104. Headstock tilt controls.
Tilt Scale
Angle
Lock Nut
Center
Bolt
Z-Axis
Lock
Levers
Model G0768/G0769 (Mfd. Since 8/15) -63-
Table Travel
The cross slide table travels in two directions, as
illustrated in Figure 105:
• X-axis (longitudinal)
• Y-axis (cross)
X-Axis or Longitudinal Travel (Left & Right)
Y-Axis or
Cross Travel
(In & Out)
Figure 105. Possible directions of cross slide
travel.
Cross Slide Handwheel (Y-Axis)
Graduated Dial
Increments .................................0.002" (0.05mm)
One Full Revolution .....................0.08" (2.03mm)
Use this handwheel to move the cross slide table
toward or away from the tooling. The cross slide
handwheel has a direct-read graduated dial,
which will read twice the actual table cross feed
travel.
Carriage Handwheel (X-Axis)
Graduated Dial
Increments ................................... 0.01" (0.25mm)
One Full Revolution .......................... 1" (25.4mm)
Use the carriage handwheel to move the carriage
left or right along the bed. Adjust the position of
the graduated scale by holding the handwheel
with one hand and turning the dial with the other.
Figure 106. Table travel controls.
These movements are controlled by the carriage
handwheel and cross slide handwheel, (see
Figure 106).
Cross Slide
Handwheel
(Y-Axis)
Cross Slide
Table
Carriage
Handwheel
(X-Axis)
-64- Model G0768/G0769 (Mfd. Since 8/15)
The Model G0769 features two different types of
spindle downfeed controls: coarse and fine, as
shown in Figure 107.
Using Spindle
Downfeed Controls
Coarse Downfeed
Coarse downfeed is typically used for drilling
applications. Rotate either of the coarse downfeed
handles (see Figure 107) to lower the spindle,
and an internal coil spring helps raise the spindle
back to the top position when you stop applying
downward pressure on the handle.
Note: To maintain control of the upward spindle
travel and the rotating bit in your workpiece,
always continue holding the handle until the
spindle returns to the top position. Letting go of
the coarse downfeed handles when the spindle
is in the lowered position will cause the spindle to
retract too quickly and slam up into the headstock
or lift the workpiece and cause it to spin out of
control.
The coarse downfeed hub features a graduated
dial that measures spindle movement in 0.02"
increments, with one full revolution equaling 2.00"
of spindle travel.
Fine Downfeed
Fine downfeed is typically used for milling applica-
tions, because the spindle only moves up or down
when the fine downfeed handwheel (see Figure
107) is rotated (there is no automatic spindle
return to the top position, as with the coarse
downfeed controls). This allows the spindle height
to be locked in place for precise Z-axis positioning
of a cutter or end-mill when milling a flat surface
across the face of a workpiece. In order to ensure
the milled surface remains flat, the spindle height
cannot move until the entire milling operation is
complete.
The fine downfeed graduated dial measures spin-
dle movement in 0.001" increments, with one full
revolution equaling 0.080" of spindle travel.
Engaging Fine Downfeed Controls
In the following example, the fine downfeed
controls are used to mill 0.010" off a workpiece:
1. Use vertical travel handwheel (see Figure
103 on next page) to adjust cutting tool just
above workpiece surface, then secure the
headstock with Z-axis lock levers.
2. Tighten downfeed selector knob (see Figure
107) to engage fine downfeed handwheel.
3. Loosen quill lock lever.
4. Rotate fine downfeed handwheel clockwise
and lower cutting tool so it just touches
workpiece.
5. Move workpiece out of the way.
6. Using graduated dial to gauge spindle move-
ment, rotate fine downfeed handwheel clock-
wise 0.010".
7. Tighten quill lock lever.
8. Turn mill/drill ON and perform cutting pass.
Figure 107. Spindle controls.
Quill Lock
Lever
Fine
Downfeed
Handwheel
Coarse
Downfeed
Handle
Downfeed
Selector
Knob
Graduated Dials
Model G0768/G0769 (Mfd. Since 8/15) -65-
Installing/Removing
Tooling
Cutting tools are sharp and
can easily cause cutting
injuries. Always protect
your hands with leather
gloves or shop rags when
handling cutting tools.
The Model G0769 includes a 1⁄2" drill chuck with
MT#2 arbor (see Figure 108).
Figure 108. 1⁄2" chuck joined with MT#2 arbor.
Installing Tooling
Tools Needed Qty
Wrench 8mm ..................................................... 1
Wrench 17mm.................................................... 1
Wrench 25mm ................................................... 1
To install tooling:
1. DISCONNECT MACHINE FROM POWER!
2. Remove drawbar cap (see Figure 109).
Figure 109. Location of drawbar cap.
Drawbar Cap
3. Insert tooling into spindle until in contacts
drawbar.
4. Working from top, thread drawbar by hand
into tooling until it is snug (see Figure 110).
Figure 110. Threading drawbar into tooling.
5. Tighten drawbar.
Note: Do not overtighten drawbar.
Overtightening makes tool removal difficult
and will damage arbor and threads.
6. Tighten drawbar lock nut, as shown in Figure
111.
7. Re-install drawbar cap.
Figure 111. Tightening drawbar lock nut.
Drawbar
Locknut
-66- Model G0768/G0769 (Mfd. Since 8/15)
Removing Tooling
Tools Needed Qty
Wrench 8mm ..................................................... 1
Wrench 17mm.................................................... 1
Wrench 25mm ................................................... 1
Brass Hammer .................................................. 1
To remove tooling:
1. DISCONNECT MACHINE FROM POWER!
2. Remove drawbar cap.
3. Loosen drawbar lock nut (see Figure 111) on
previous page.
4. Unthread drawbar from tooling one full rota-
tion.
Note: Do not fully unthread tooling from
drawbar or the drawbar and tool threads
could be damaged in the next step.
Figure 112. Tapping drawbar to unseat tool
taper.
6. Hold onto tooling with one hand and fully
unthread drawbar.
5. Tap top of drawbar with hammer to unseat
taper (see Figure 112).
Model G0768/G0769 (Mfd. Since 8/15) -67-
Setting Spindle Speed
1. Rotate spindle speed dial all the way coun-
terclockwise to set spindle speed to lowest
value.
Using the correct spindle speed is important for
safe and satisfactory results, as well as maximiz-
ing tool life.
To set the mill spindle speed for operation, you will
need to: 1) Determine the best spindle speed for
the cutting/drilling task, and 2) configure the high/
low gearbox knob for the desired speed range,
3) use the spindle speed dial and spindle speed
RPM display to get the spindle speed.
Determining Spindle Speed
Many variables affect the optimum spindle speed
to use for any given operation, but the two most
important are the recommended cutting speed
for the workpiece material and the diameter of
the cutting tool, as noted in the formula shown in
Figure 113.
Cutting speed, typically defined in feet per minute
(FPM), is the speed at which the edge of a tool
moves across the material surface.
A recommended cutting speed is an ideal speed
for cutting a type of material in order to produce
the desired finish and optimize tool life.
The books Machinery’s Handbook or Machine
Shop Practice, and some internet sites, pro-
vide excellent recommendations for which cutting
speeds to use when calculating the spindle speed.
These sources also provide a wealth of additional
information about the variables that affect cutting
speed and they are a good educational resource.
Also, there are a large number of easy-to-use
spindle speed calculators that can be found on
the internet. These sources will help you take into
account the applicable variables in order to deter-
mine the best spindle speed for the operation.
Cutting Speed (FPM) x 12
*Recommended
Tool Dia. (in inches) x 3.14
=
Spindle
Speed
(RPM)
*Double if using carbide cutting tool
Figure 113. Spindle speed formula for mill/drills.
Spindle Speed
2. Rotate high/low gearbox knob (see Figure
114) to either “L” (spindle speeds 50–100
RPM) or “H” (spindle speeds 100–2000
RPM).
Note: When switching between gears, it may
be necessary to rotate spindle by hand so
gears will align and engage.
Gearbox Knob
L
(Low)
H
(High)
CENTER
(Neutral)
Figure 114. High/low gearbox knob set to low
"L".
Gearbox
Knob
3. Press ON button and turn spindle direction
switch to "F".
4. While watching RPM display, rotate spindle
speed dial clockwise until desired RPM is
reached.
-68- Model G0768/G0769 (Mfd. Since 8/15)
SECTION 6: ACCESSORIES
ACCESSORIES
order online at www.grizzly.com or call 1-800-523-4777
Installing unapproved accessories may
cause machine to malfunction, resulting in
serious personal injury or machine damage.
To reduce this risk, only install accessories
recommended for this machine by Grizzly.
NOTICE
Refer to our website or latest catalog for
additional recommended accessories.
H2987—½" Bent Lathe Dog
H2988—1" Bent Lathe Dog
H2989—1½" Bent Lathe Dog
H2990—2" Bent Lathe Dog
H2991—3" Bent Lathe Dog
T25206—11 Pc. Carbide Bit Set 5⁄16"
This 11-Pc. Carbide-Tipped Tool Bit Set includes
a wide variety of tool types for just about any
machining operation. This set also includes two
boring bars. Boring bars measure 47⁄8" long.
Shank size for all is 5⁄16".
Figure 115. T25206 11-Pc. carbide-tipped tool
set.
T26599—Optional Stand for G0768/G0769
• Size: 291⁄2" W x 32" H x 16" D
• Drawers: 12" W x 8" H x 12" D
Figure 117. T26599 Stand for G0768/G0769.
Figure 118. Recommended products for
machine lubrication.
SB1365—South Bend Way Oil-ISO 68
T23964—Moly-D Multi-purpose NLGI#2
Grease
Figure 116. Model H2987 1⁄2" Bent Lathe Dog.
Model G0768/G0769 (Mfd. Since 8/15) -69-
Figure 121. H7991 Mini Mag Base Indicator Set.
H7991—Mini Mag Base Indicator Set
Set features a 7 Jewel indicator with 0.0005" reso-
lution. The mini magnetic base measures 13⁄16" x
13⁄16" x 13⁄8" and includes a single lock knob for
easy setups. Includes 2 dovetail tool posts and a
protective plastic case.
order online at www.grizzly.com or call 1-800-523-4777
Figure 120. G9788 4-Pc. Measuring Tool Set.
G9788—4-Pc. Measuring Tool Set
This is the set you need for accurate measure-
ments. Includes a stainless steel 6" dial caliper, a
6" scale with inch scale on one side and a metric
scale on the other, a 1" carbide-tipped microm-
eter with vernier scale, and a 4" precision square
with beveled edge. Comes with molded case and
micrometer adjustment wrench.
SIZE
BODY
DIA.
DRILL
DIA.
OVERALL
LENGTH
11⁄8"3⁄64"11⁄4"
23⁄16"5⁄64"17⁄8"
31⁄4"7⁄64"2"
45⁄16"1⁄8"21⁄8"
Figure 122. HSS ground center-drill sets.
H5930—4-Pc. Center Drill Set 60°
H5931—4-Pc. Center Drill Set 82°
Double-ended HSS Center Drills are precision
ground. Each set includes sizes 1–4.
G9361—Heavy-Duty Triple Bearing Live Center
MT#2
This Triple Bearing Live Center is hardened to
61-65 Rockwell and has a unique head driving
mechanism that prevents dust, chips, and coolant
from entering the internal workings. Made with
precision, high-quality bearings, this live center
has an accuracy of 0.0003".
Figure 119. G9361 MT#2 Live Center.
-70- Model G0768/G0769 (Mfd. Since 8/15)
order online at www.grizzly.com or call 1-800-523-4777
T10253—2" Mini Self-Centering Vise with
Swivel Base
Ideal for holding small parts and model making.
Has self-centering jaws and adjustable gib on a
dovetailed way. 21⁄16" jaw opening, 2" jaw width,
25⁄8" crank handle, and base swivels 360°. Overall
size is 63⁄4" L x 4" W x 33⁄8" H with handle removed.
H6195—3" Rotary Table w/ Clamps
For horizontal or vertical use. 3" diameter table
rotates 360°. Low profile—only 1.670" tall. 45⁄16"
T-slots. 1:36 ratio or 10° per handwheel revolution.
Scale reads to 15 minutes. Has brass lock knob.
Table height in horizontal position: 15⁄8";
in vertical position: 31⁄4".
Figure 123. T10253 2" Mini Self-Centering Vise. Figure 125. H6195 3" Rotary Table w/Clamps.
MT#2 End Mill Holders
Hold your end mills in the Model G0769 spindle
with these quality end mill holders. Sized for vari-
ous end mill shanks.
Model MT Drawbar Size
T25703 #2 3⁄8"-16 TPI 3⁄16"
T25704 #2 3⁄8"-16 TPI 3⁄8"
T25705 #2 3⁄8"-16 TPI 1⁄2"
T25706 #2 3⁄8"-16 TPI 5⁄8"
Figure 126. MT#2 end mill holders.
Model Cutting
Dia. Flute Lgth OA Lgth
H3649 1⁄16"3⁄16" 11⁄2"
H3650 3⁄32"3⁄8" 11⁄2"
H3651 1⁄8"1⁄2" 11⁄2"
H3652 5⁄32"9⁄16"2"
H3653 3⁄16"5⁄8"2"
H3654 7⁄32"5⁄8" 21⁄2"
H3655 1⁄4"3⁄4" 21⁄2"
H3656 9⁄32"3⁄4" 21⁄2"
H3657 5⁄16"13 ⁄16" 21⁄2"
H3658 3⁄8"7⁄8" 21⁄2"
H3659 7⁄16"1" 23⁄4"
H3660 1⁄2"1" 3"
Figure 124. 4-flute C-2 grade carbide end mills.
4-Flute C-2 Grade Carbide End Mills
These American-made 4-flute Carbide End Mills
feature standard cutting lengths and nominal
minus diameter tolerances. Recommended for
profiling and finishing non-ferrous materials.
Model G0768/G0769 (Mfd. Since 8/15) -71-
SECTION 7: MAINTENANCE
Schedule
Ongoing
To maintain a low risk of injury and proper
machine operation, if you ever observe any of the
items below, shut down the machine immediately
and fix the problem before continuing operations:
• Loose mounting bolts or fasteners.
• Worn, frayed, cracked, or damaged wires.
• Guards or covers removed.
• Emergency Stop button not working correctly
or not requiring you to reset it before starting
the machine again.
• Damaged or malfunctioning components.
Daily, Before Operations
• Add oil to the ball oilers (Page 72).
• Lubricate the leadscrew and carriage rack
(Page 73).
• Lubricate the bedways (Page 73).
• Clean/lubricate the cross slide and com-
pound slide (Page 73).
• Disengage the half nut on the carriage (to
prevent crashes upon startup).
• Lubricate column ways—G0769 Only (Page
75).
• Lubricate quill outside surface—G0769 Only
(Page 75).
Daily, After Operations
• Press the Emergency Stop button (to prevent
accidental startup).
• Vacuum/clean all chips and swarf from bed,
slides.
• Wipe down all unpainted or machined sur-
faces with an oiled rag.
Every 90 Hours of Operation
• Lubricate quill rack—G0769 Only (Page 75).
• Lubricate headstock gears—G0769
(Page 76).
Every 120 Hours of Operation
• Lubricate Z-axis leadscrew—G0769 Only
(Page 76).
Annually
• Lubricate end gears (Page 74).
Cleaning/Protecting
Because of its importance, we recommend that
the cleaning routine be planned into the workflow
schedule.
Typically, the easiest way to clean swarf from the
machine is to use a brush and wet/dry shop vacu-
um that are dedicated for this purpose. The small
chips left over after vacuuming can be wiped up
with a slightly oiled rag. Avoid using compressed
air to blow off chips, as this may drive them deep-
er into the moving surfaces or cause sharp chips
to fly into your face or hands.
All unpainted and machined surfaces should be
wiped down daily to keep them rust free and in top
condition. This includes any surface that is vulner-
able to rust if left unprotected. Use a quality ISO
68 way oil (see Page 68 for offerings from Grizzly)
to prevent corrosion.
Always disconnect power
to the machine before
performing maintenance.
Failure to do this may
result in serious person-
al injury.
-72- Model G0768/G0769 (Mfd. Since 8/15)
Lubrication
NOTICE
The recommended lubrication is based on
light-to-medium usage. Since lubrication
helps to protect value and operation of
machine, these lubrication tasks may need
to be performed more frequently than rec-
ommended, depending on usage.
Failure to follow reasonable lubrication
practices as instructed in this manual could
lead to premature failure of machine com-
ponents and will void the warranty.
Lubrication Frequency
Items Needed Qty
Clean Rag ........................................ As Needed
Mineral Spirits .................................... As Needed
Stiff Brush .......................................................... 1
Pump-Type Oil Can w/Plastic Cone Tip ............ 1
The lathe has metal-to-metal sliding surfaces that
require regular lubrication to maintain smooth
movement and ensure long-lasting operation.
Other than the lubrication points covered in this
section, all other bearings are internally lubricated
and sealed at the factory. Simply leave them
alone unless they need to be replaced.
Before performing any lubrication task,
DISCONNECT MACHINE FROM POWER!
We recommend using Model SB1365 Way Oil
or equivalent (see Page 68) for most lubrication
tasks.
Ball Oilers
Lube Type ............................... ISO 32 Equivalent
Lube Amount ............................ 1 or 2 Squirts/Fill
Lubrication Frequency ................................. Daily
This lathe has four ball oilers that should be oiled
on a daily basis before beginning operation.
Proper lubrication of ball oilers is done with a
pump-type oil can that has a plastic or rubber-
ized cone tip. We do not recommend using metal
needle or lance tips, as they can push the ball too
far into the oiler, break the spring seat, and lodge
the ball in the oil galley.
Lubricate the ball oilers before and after machine
use, and more frequently under heavy use. When
lubricating ball oilers, first clean the outside sur-
face to remove any dust or grime. Push the tip of
the oil can nozzle against the ball oiler to create
a hydraulic seal, then pump the oil can once or
twice. If you see sludge and contaminants coming
out of the lubrication area, keep pumping the oil
can until the oil runs clear. When finished, wipe
away any excess oil.
Refer to Figure 127 to identify the location of each
ball oiler.
Lubrication Task Frequency Page
Ball Oilers Daily This
Page
Leadscrew & Carriage
Rack Daily 73
Bedways Daily 73
Feed Gearbox Annually 73
Cross Slide & Compound
Slide Daily 73
End Gears Annually 74
Mill Column Ways Daily 75
Mill Quill Outside Surface Daily 75
Mill Quill Rack 90 Hrs. 75
Mill Z-Axis Leadscrew 120 Hrs. 76
Mill Headstock Gears 90 Hrs. 76
Figure 127. Ball oilers.
Ball Oilers
Ball Oilers
Model G0768/G0769 (Mfd. Since 8/15) -73-
Leadscrew & Carriage Rack
Lube Type . . Model SB1365 or ISO 68 Equivalent
Lube Amount ..................................... As Needed
Lubrication Frequency ................................. Daily
Before lubricating the leadscrew and carriage
rack (see Figure 128), clean them first with min-
eral spirits. Use a stiff brush to help remove any
debris or grime. Apply a thin coat of oil along the
entire length of the carriage rack. Use a stiff brush
to make sure oil is applied into the leadscrew
threads.
Note: In some environments, abrasive material
can become caught in the leadscrew lubricant and
drawn into the half nut. In this case, lubricate the
leadscrew with a quality dry lubricant.
Feed Gearbox
Bedways
Lube Type . . Model SB1365 or ISO 68 Equivalent
Lube Amount ..................................... As Needed
Lubrication Frequency ................................. Daily
Before lubricating the bedways (see Figure 128),
clean them with mineral spirits. Apply a thin coat
of oil along the length of the bedways. Move the
steady rest, carriage, and tailstock to access the
entire length of the bedways.
Figure 128. Leadscrew, rack and bedways.
Bedways
Rack
Leadscrew
Lube Type . . Model T23964 or NLGI#2 Equivalent
Frequency ....................... Annually or As Needed
Cross Slide & Compound Slide
Lube Type . . Model SB1365 or ISO 68 Equivalent
Lube Amount ........................................Thin Coat
Lubrication Frequency ................................. Daily
Use the handwheels to separately move the
cross slide and compound rest as far forward as
possible (see Figure 130). Clean the slides with
mineral spirits and wipe down with a rag. Apply
lubricant and move the slides back and forth to
distribute the oil.
Figure 130. Location of bottom slides.
Compound
Bottom Slide
Cross Slide
Bottom Slide
The gearbox can be quickly lubricated (as
necessary or if noisy) by removing the set screw
shown in Figure 107 and adding a shot or two of
grease from a grease gun. The grease inside the
gearbox will eventually need to be replaced. To do
this, remove the gearbox cover, use mineral spirits
and a stiff brush to clean gears, allow them to dry,
reapply new grease, and re-install cover.
Figure 129. Feed gearbox quick lubrication
location.
Set
Screw
Feed Gearbox
-74- Model G0768/G0769 (Mfd. Since 8/15)
End Gears
Lube Type . . Model T23964 or NLGI#2 Equivalent
Frequency ............... Annually or When Changing
The end gears, shown in Figure 131, should
always have a thin coat of heavy grease to
minimize corrosion, noise, and wear. Wipe away
excess grease that could be thrown onto the
V-belts and reduce optimal power transmission
from the motor.
Figure 131. End gears.
Handling & Care
Make sure to clean and lubricate any gears you
install or change. Be very careful during handling
and storage—the grease coating on the gears will
easily pickup dirt or debris, which can then spread
to the other gears and increase the rate of wear.
Make sure the end cover remains installed when-
ever possible to keep the gears free of dust or
debris from the outside environment.
Lubricating
1. DISCONNECT MACHINE FROM POWER!
2. Remove end gear cover and all end gears
shown in Figure 131.
3. Clean end gears thoroughly with mineral spir-
its to remove old grease. Use a small brush if
necessary to clean between teeth.
4. Clean shafts, and wipe away any grease
splatters in vicinity and on inside of end
cover.
5. Using a clean brush, apply a thin layer of
white lithium grease on the gears. Make sure
to get grease between gear teeth, but do not
fill teeth valleys.
6. Apply a small dab of grease to each gear
shaft.
7. Install end gears and mesh them together
with an approximate 0.002"–0.004" backlash.
Once gears are meshed together, apply a
small dab of grease between them where
they mesh together—this grease will be dis-
tributed when gears rotate and re-coat any
areas scraped off during installation.
8. Re-install end cover before re-connecting
machine to power.
Model G0768/G0769 (Mfd. Since 8/15) -75-
Column Ways (G0769)
Lube Type . . Model SB1365 or ISO 68 Equivalent
Lube Amount ........................................Thin Coat
Lubrication Frequency ................................. Daily
Regular lubrication will ensure your milling head-
stock performs at its highest potential. Regularly
wipe table and column ways with recommended
lubrication, then move components back and
forth several times to ensure smooth movements
(see Figure 132).
Quill Rack
Lube Type . . Model T23964 or NLGI#2 Equivalent
Lube Amount ........................................Thin Coat
Lubrication Frequency ......... 90 hrs. of Operation
Move quill all the way down to gain full access to
quill rack (see Figure 134), lock the quill in place,
then clean teeth with mineral spirits, shop rags,
and a brush.
Quill Outside Surface
Lube Type . . Model SB1365 or ISO 68 Equivalent
Lube Amount ........................................Thin Coat
Lubrication Frequency ................................. Daily
Without disturbing grease on quill rack, clean out-
side smooth surface of quill (see Figure 133) with
mineral spirits and shop rags.
When dry, apply thin coat of lubricant to smooth
surface, then move spindle up and down to evenly
distribute oil.
Figure 132. Z-axis way lubrication location.
Z-Axis Ways
(1 of 2)
Figure 133. Outside surface of quill.
Quill Outside
Surface
When dry, use a brush to apply a thin coat of
grease to teeth, then raise/lower the quill several
times to evenly distribute grease.
Note: Re-apply oil that may have been removed
during the cleaning process to the quill surface
around the rack.
Figure 134. Quill rack location.
Rack
-76- Model G0768/G0769 (Mfd. Since 8/15)
Headstock Gears (G0769)
Lube Type . . Model T23964 or NLGI#2 Equivalent
Lube Amount ........................................Thin Coat
Lubrication Frequency ......... 90 hrs. of Operation
To lubricate headstock gears:
1. Remove cap screw and headstock gear
access cover, as shown in Figure 136.
Figure 136. Headstock access cover and cap
screw location.
2. Using small brush, apply thin coat of grease
to headstock gears.
3. Operate mill/drill in both high and low gear
settings to work grease through gears.
4. Re-install access cover and cap screw
removed in Step 1.
Z-Axis Leadscrew (G0769)
Lube Type . . Model T23964 or NLGI#2 Equivalent
Lube Amount ........................................Thin Coat
Lubrication Frequency ....... 120 hrs. of Operation
Lower headstock approximately 3⁄4 of the way
down the Z-axis ways, as shown in Figure 135.
Z-Axis
Leadscrew
Figure 135. Z-axis leadscrew location.
Use mineral spirits and a brush to clean as much
existing grease and debris off of Z-axis leadscrew
shown in Figure 135 as possible. When dry, apply
NLGI#2 grease to exposed leadscrew threads.
Move headstock through its full range of motion
several times to disperse grease along full length
of leadscrew.
Headstock
Gears
Headstock
Gear
Access
Cover
Cap Screw
Model G0768/G0769 (Mfd. Since 8/15) -77-
Machine Storage
Preparing Machine for Storage
1. DISCONNECT MACHINE FROM POWER!
2. Thoroughly clean all unpainted, bare metal
surfaces, then apply a liberal coat of way
oil, heavy grease, or rust preventative. Take
care to ensure these surfaces are completely
covered and that rust preventative or grease
is kept off of painted surfaces.
3. Lubricate machine as outlined in lubrication
section. Be sure to use an oil can to purge all
ball oilers and oil passages with fresh oil.
4. Place a few moisture absorbing desiccant
packs inside electrical box.
5. Cover machine and place it in a dry area that
is out of direct sunlight and away from haz-
ardous fumes, paint, solvents, or gas. Fumes
and sunlight can bleach or discolor paint.
6. Every few months, rotate by hand all gear-
driven components a few times in several
gear selections. This will keep bearings,
bushings, gears, and shafts well lubricated
and protected from corrosion—especially
during winter months.
Slide carriage, tailstock, and steady rest down
lathe bed to make sure that way spotting is
not beginning to occur. Move mill headstock
up and down column (Model G0769 only).
Bringing Machine Out of Storage
1. Remove moisture-absorbing desiccant packs
from electrical box.
2. Repeat Test Run and Spindle Break-In pro-
cedures, beginning on Page 27.
To prevent the development of rust and corrosion,
the lathe must be properly prepared if it will be
stored for a long period of time. Doing this will
ensure the lathe remains in good condition for
later use.
-78- Model G0768/G0769 (Mfd. Since 8/15)
Review the troubleshooting and procedures in this section if a problem develops with your machine. If you
need replacement parts or additional help with a procedure, call our Technical Support.
Note: Please gather
the serial number and manufacture date of your machine before calling.
SECTION 8: SERVICE
Troubleshooting
Symptom Possible Cause Possible Solution
Machine does not
start or a circuit
breaker trips.
1. Emergency stop button engaged or at fault.
2. Incorrect power supply voltage.
3. Blown fuse.
4. Power supply circuit breaker tripped or fuse
blown.
5. Wiring open/has high resistance.
6. On/Off switch at fault.
7. Spindle speed dial in OFF position or at
fault.
8. Spindle direction switch turned to "0" or at
fault.
9. Lathe/mill selector switch in neutral, or at
fault.
10. Motor brushes at fault.
11. Motor at fault.
12. Spindle rotation switch at fault.
1. Press side tab in and lift switch cover. Press On
button to reset; replace if not working properly.
2. Ensure correct power supply voltage.
3. Replace fuse/ensure no shorts (Page 85).
4. Ensure circuit is sized correctly and free of shorts.
Reset circuit breaker or replace fuse.
5. Check/fix broken, disconnected, or corroded wires.
6. Replace switch.
7. Turn spindle speed dial past "0". Ensure dial has
correct voltage. Replace if faulty.
8. Turn spindle direction switch to "F" or "R". Ensure
dial has correct voltage. Replace if faulty.
9. Turn lathe/mill selector switch to "lathe" or "mill"
mode. Replace if faulty.
10. Remove/replace brushes (Page 86).
11. Test/repair/replace.
12. Test/replace switch.
Machine stalls or is
underpowered.
1. Machine undersized for task.
2. Feed rate/cutting speed too fast.
3. Wrong workpiece material.
4. Timing belt slipping.
5. Motor overheated.
6. Computer board at fault.
7. Motor speed dial at fault.
8. Motor brushes at fault.
9. Pulley/sprocket slipping on shaft.
10. Motor bearings at fault.
11. Motor at fault.
1. Use sharp bits/chisels at correct angle; reduce feed
rate/depth of cut; use coolant if possible.
2. Decrease feed rate/cutting speed.
3. Use correct type/size of metal.
4. Tension/replace belt; ensure pulleys are aligned.
5. Use sharp bits; reduce feed rate/depth of cut.
6. Clean motor, let cool, and reduce workload.
7. Test and replace if at fault.
8. Remove/replace brushes (Page 86).
9. Replace loose pulley/shaft.
10. Test by rotating shaft; rotational grinding/loose shaft
requires bearing replacement.
11. Test/repair/replace.
Machine has
vibration or noisy
operation.
1. Motor or component loose.
2. Bit chattering.
3. V-belt(s) worn or loose.
4. Motor fan rubbing on fan cover.
5. Motor mount loose/broken.
1. Inspect/replace damaged bolts/nuts, and retighten
with thread locking fluid.
2. Replace/sharpen bit; index bit to workpiece; use
correct feed rate and cutting RPM; retract tool
holder and position workpiece closer.
3. Inspect/replace belts with a new matched set.
4. Fix/replace fan cover; replace loose/damaged fan.
5. Tighten/replace.
Motor & Electrical
Model G0768/G0769 (Mfd. Since 8/15) -79-
Lathe Operation
Symptom Possible Cause Possible Solution
Bad surface finish. 1. Wrong spindle speed or feed rate.
2. Dull tooling or poor tool selection.
3. Tool height not at spindle centerline.
4. Too much play in gibs.
1. Adjust for appropriate spindle speed and feed rate.
2. Sharpen tooling or select a better tool for the
intended operation.
3. Adjust tool height to spindle centerline (see Page
45).
4. Tighten gibs (see Page 83).
Tapered tool difficult
to remove from
tailstock quill.
1. Quill not fully retracted into tailstock.
2. Contaminants not removed from taper
before inserting into quill.
1. Turn quill handwheel until tapered tool is forced out
of quill.
2. Clean taper and bore, then re-install tool.
Cross slide,
compound rest, or
carriage feed has
sloppy operation.
1. Ways loaded with shavings, dust, or grime.
2. Gibs are out of adjustment.
3. Handwheel loose or excessive backlash.
4. Leadscrew mechanism worn or out of
adjustment.
1. Clean ways and relubricate.
2. Adjust gibs (see Page 83).
3. Tighten handwheel fasteners, adjust handwheel
backlash to a minimum (see Page 82).
4. Adjust leadscrew to remove end play (see Page
82).
Cross slide,
compound,
or carriage
handwheels hard to
move.
1. Ways loaded with chips, dust, or grime.
2. Gibs are too tight.
3. Backlash setting too tight.
4. Bedways are dry.
5. Half nut lever engaged.
1. Clean ways and lubricate.
2. Loosen gibs slightly (see Page 83).
3. Slightly loosen backlash setting (see Page 82).
4. Lubricate bedways.
5. Disengage half nut lever for manual feeding.
Cutting tool
or machine
components vibrate
excessively during
cutting.
1. Tool holder not tight enough.
2. Cutting tool sticks too far out of tool holder;
lack of support.
3. Gibs are out of adjustment.
4. Dull cutting tool.
5. Incorrect spindle speed or feed rate.
1. Check for debris, clean, and retighten.
2. Re-install cutting tool so no more than 1⁄3 of the total
length is sticking out of tool holder.
3. Adjust gibs at affected component (see Page 83).
4. Replace or resharpen cutting tool.
5. Use the recommended spindle speed and feed rate.
Workpiece is
tapered.
1. Headstock and tailstock not properly
aligned.
1. Re-align tailstock to headstock spindle centerline
(see Page 39).
Chuck jaws will
not move or do not
move easily.
1. Chips lodged in jaws or scroll plate. 1. Remove jaws, clean and lubricate scroll plate, then
replace jaws.
-80- Model G0768/G0769 (Mfd. Since 8/15)
Mill Operation
Symptom Possible Cause Possible Solution
Tool slips in spindle. 1. Tool is not fully drawn up into spindle taper.
2. Debris on tool or in spindle taper.
3. Taking too big of cut.
1. Tighten drawbar (Do not overtighten).
2. Clean collet and spindle taper.
3. Lessen depth of cut and allow chips to clear.
Breaking tools or
cutters.
1. Spindle speed/feed rate is too fast.
2. Cutting tool too small.
3. Cutting tool getting too hot.
4. Taking too big of a cut.
5. Spindle extended too far down.
1. Set spindle speed correctly (Page 67) or use slower
feed rate.
2. Use larger cutting tool and slower feed rate.
3. Use coolant fluid or oil for appropriate application if
possible.
4. Lessen depth of cut and allow chips to clear.
5. Fully retract spindle and lower headstock. This
increases rigidity.
Workpiece vibrates
or chatters during
operation.
1. Workpiece not secure.
2. Spindle speed/feed rate is too fast.
3. Spindle extended too far down.
1. Properly clamp workpiece on table or in vise.
2. Set spindle speed correctly (Page 67) or use slower
feed rate.
3. Fully retract spindle and lower headstock. This
increases rigidity.
Cross slide table is
hard to move.
1. Chips have loaded up on ways.
2. Ways are dry and need lubrication.
3. Gibs are too tight.
1. Frequently clean away chips that load up during
milling operations.
2. Lubricate ways (Page 73).
3. Adjust gibs (see Page 83).
Bad surface finish. 1. Spindle speed/feed rate is too fast.
2. Using dull or incorrect cutting tool.
3. Wrong rotation of cutting tool.
4. Workpiece not secure.
5. Spindle extended too far down.
1. Set spindle speed correctly (Page 67) or use a
slower feed rate.
2. Sharpen cutting tool or select one that better suits
operation.
3. Check for proper cutting rotation for cutting tool.
4. Properly clamp workpiece on table or in vise.
5. Fully retract spindle and lower headstock. This
increases rigidity.
Model G0768/G0769 (Mfd. Since 8/15) -81-
Tensioning &
Replacing V-Belts
V-belts stretch and wear with use, so it is impor-
tant to routinely monitor belt tension. V-belts that
are improperly tensioned or exposed to grease/oil
will slip and poorly transmit power from the motor.
To ensure optimal power transmission, inspect
belts on a monthly basis to verify they are properly
tensioned and free of oil/grease. Replace V-belts
when they become cracked, frayed, or glazed.
Tools Needed Qty
Hex Wrench 3, 4mm ....................................1 Ea.
Open-End Wrench 10, 13 mm .....................1 Ea.
Pulley
Deflection
Pulley
Figure 140. Correct V-belt deflection.
1⁄8"
5. Tension V-belts until there is approximately
1⁄8" deflection when pushed with moderate
pressure, as shown in Figure 140.
—If there is more than 1⁄8" deflection when
the V-belts are pushed with moderate pres-
sure, adjust tension until it is correct.
6. Tighten pivot block bolt and hex nut loosened
in Step 3.
7. Re-install and secure end cover and electri-
cal panel.
Figure 139. Tensioner screw and V-belts.
Upper
V-Belt
Tensioner
Screw
Idler
Pulley
4. Turn tensioner screw (see Figure 139) clock-
wise to tension V-belts or counterclockwise to
loosen V-belts.
—If replacing V-belts, loosen idler pulley and
carefully roll upper and lower V-belts off of
pulleys, then re-install new V-belts in same
manner.
Lower
V-Belt
To adjust tension or replace V-belts:
1. DISCONNECT MACHINE FROM POWER!
2. Remove end cover and electrical panel (see
Figure 137).
3. Using flat 10mm wrench provided with lathe,
hold pivot block bolt shown in Figure 138,
and loosen hex nut with 13mm wrench.
Figure 138. Pivot block bolt and hex nut for
idler pulley adjustment.
Hex Nut
Pivot Block
Bolt
Pivot Block
Idler
Pulley
Figure 137. Location of parts for removing panel.
Electrical
Panel
End Cover
Cap Screws to
Remove (1 of 5)
-82- Model G0768/G0769 (Mfd. Since 8/15)
Adjusting Backlash
Backlash is the amount of free play felt while
changing rotation directions with the handwheel.
This can be adjusted on the cross slide leadscrew.
Before beginning any adjustment, make sure all
associated components are cleaned and lubri-
cated and locks are loose.
When adjusting backlash, tighten the components
enough to remove backlash, but not so much that
the components bind the leadscrew, making it
hard to turn. Overtightening will cause excessive
wear to the nut and leadscrew.
Reducing backlash to less than 0.002" is
impractical and can lead to accelerated
wear in leadscrew and other components.
Avoid temptation to overtighten leadscrew
nut or set screw while adjusting.
Cross Slide
Tools Needed: Qty
Hex Wrench 3mm ............................................. 1
The cross slide backlash is adjusted by tighten-
ing and loosening the set screw shown in Figure
139. The set screw adjusts the height of the
leadscrew nut, taking up lash between the nut and
leadscrew.
Adjusting Leadscrew
End Play
After a long period of time, you may find that the
leadscrew develops excessive end play. This
lathe is designed so that end play can be removed
with a simple adjustment.
Tools Needed Qty
Hex Wrench 4mm .............................................. 1
Open-End Wrench 14mm .................................. 1
To remove leadscrew end play:
1. DISCONNECT MACHINE FROM POWER!
2. Loosen set screw shown in Figure 142 sev-
eral turns.
3. Tighten retaining nut with your fingers so it
just contacts end bracket, then back nut off
1⁄8 turn.
4. Hold nut in position and tighten set screw
against leadscrew until snug.
Figure 142. Leadscrew end play adjustments.
Set Screw
Retaining Nut
Leadscrew
End Bracket
Move the cross slide handwheel back and forth
and adjust backlash until it is approximately
0.002"–0.003", as indicated on the graduated dial.
Figure 141. Cross slide backlash adjustment.
Set Screw
Model G0768/G0769 (Mfd. Since 8/15) -83-
Adjusting Gibs
The goal of adjusting the gib screws is to remove
sloppiness or "play" from the ways without over-
adjusting them to the point where they become
stiff and difficult to move.
In general, loose gibs cause poor finishes and
tool chatter; however, over-tightened gibs cause
premature wear and make it difficult to turn the
handwheels.
The cross-slide and compound slide both use a
straight gib, which is adjusted with cap screws
and hex nuts along its length. The screws push
the gib in to create more contact with the slid-
ing surfaces. The Z-axis ways (G0769 only) use
a tapered gib, which is adjusted with screws on
each end.
The gib adjustment process usually requires some
trial-and-error. Repeat the process as necessary
until you find the best balance between loose and
stiff movement. Most machinists find that the ideal
gib adjustment is one where a small amount of
drag or resistance is present, yet the handwheels
are still somewhat easy to move.
Clean and lubricate the ways before beginning
any adjustments. Refer to Lubrication on Page
72 for instructions and lubricant specifications.
Tools Needed Qty
Open-End Wrench 7mm .................................... 1
Hex Wrench 3mm .............................................. 1
Flat Head Screwdriver #2 .................................. 1
3. Adjust all corresponding cap screws in small
and equal increments, then test movement of
slide by rotating handwheel.
Note: Turning cap screws clockwise tightens
the gib, and turning them counterclockwise
loosens the gib.
4. When satisfied with gib adjustment, use hex
wrench to prevent set screws from moving,
then retighten hex nuts to secure settings.
5. Re-check movement of slide and, if neces-
sary, repeat Steps 2–4.
Figure 144. Compound slide gib adjustment hex
nuts and cap screws.
Compound Slide
Adjustment
Fasteners
1. DISCONNECT MACHINE FROM POWER!
2. Loosen hex nuts on side of cross slide or
compound slide (see Figures 143–144).
Figure 143. Cross slide gib adjustment hex nuts
and cap screws.
Cross Slide
Adjustment
Fasteners
Adjusting Cross Slide and Compound
Slide Gibs
-84- Model G0768/G0769 (Mfd. Since 8/15)
Loosen one gib adjustment screw (see Figure
145) and tighten the opposing screw the same
amount to move the gib, while at the same time
using the handwheel to move the headstock until
you feel a slight drag in the path of movement.
Adjusting Z-Axis Way Gib
Figure 145. Location of top Z-axis way gib.
Z-Axis Way Gib
(1 of 2)
The rigidity of the half nut engagement is adjusted
by tightening or loosening the half nut gib screws.
Adjust the half nut if it feels too loose or too tight
when being engaged. Movement that is too stiff
will accelerate wear. Movement that is too slop-
py will produce inaccurate turning or threading
results.
Tools Needed Qty
Open-End Wrench 7mm .................................... 1
Hex Wrench 3mm .............................................. 1
To adjust half nut:
1. DISCONNECT MACHINE FROM POWER!
2. Disengage half nut.
3. Loosen thread dial cap screw, tilt dial out of
way, then secure to access gib screws and
nuts (see Figure 146).
Adjusting Half Nut
4. Loosen gib nuts and adjust screws in small,
even increments so one end of the gib does
not become tighter than the other.
5. Engage/disengage half nut several times and
notice how it feels. The adjustment is cor-
rect when half nut firmly and easily engages
leadscrew while opening and closing.
6. Repeat Steps 4–5, if necessary, until satis-
fied with feel of half nut engagement.
7. Re-install thread dial so teeth mesh with
leadscrew, then tighten cap screw.
Figure 146. Half nut gib adjustment set screws.
Cap Screw
Gib
Screws &
Nuts
Model G0768/G0769 (Mfd. Since 8/15) -85-
Replacing Fuse
This machine features on-board fuses designed
to protect sensitive electrical parts from thermal
damage in the event of an overload. If the spindle
does not start, replace the fuses.
The Model G0768 has two fuses, the Model
G0769 has three fuses.
G0768 Replacement Fuses: (1) P0768906,
(1) P076 8911.
G0769 Replacement Fuses: (1) P0769906,
(2) P076 8911.
To replace fuses:
1. DISCONNECT MACHINE FROM POWER!
2. Unthread fuse holders (see Figure 148) by
rotating them counterclockwise, then remove
fuses.
3. Insert new fuses.
4. Re-install fuse holders.
Figure 148. Fuse holders and fuses
(Model G0768 shown).
Fuses
Fuse
Holders
Fuse
Holder
Holes
Replacing
Leadscrew Shear Pin
The longitudinal leadscrew is secured to the feed
rate gearing in the headstock with the use of a
soft-metal shear pin (see Figure 147). The shear
pin is designed to break and disengage power
to the leadscrew to help protect more expensive
lathe components if you crash your carriage or
take too large of a cut and overload the lathe.
Replacement shear pin part number: P0768334.
Tools Needed Qty
Hammer ............................................................. 1
Punch 3mm ....................................................... 1
To replace shear pin:
1. DISCONNECT MACHINE FROM POWER!
2. Rotate leadscrew so shear pin faces up and
down. If connecting collar rotates indepen-
dently from leadscrew, then rotate collar so
shear pin hole aligns with those in leadscrew.
3. Use punch and hammer to drive out pieces of
old shear pin.
4. Make sure hole in collar and leadscrew are
aligned, then tap new shear pin completely
through holes in collar and leadscrew.
Figure 147. Longitudinal leadscrew shear pin.
Connecting
Collar
Shear Pin
-86- Model G0768/G0769 (Mfd. Since 8/15)
Replacing Brushes
This machine is equipped with one (G0768) or two
(G0769) universal motors that use carbon brushes
to transmit electrical current inside the motor. These
brushes are considered to be regular "wear items" or
"consumables" that will eventually need to be
replaced. The frequency of this replacement is
directly related to how much the motor is used
and how hard it is pushed.
Replace the carbon brushes when the motor no lon-
ger reaches full power, or when the brushes mea-
sure less than 1⁄4" long (new brushes are 5⁄8" long).
Tools Needed Qty
Hex Wrench 3, 4mm .....................................1 Ea
Flat Head Screwdriver #2 .................................. 1
Phillips Head Screwdriver #2 ............................ 1
G0768/G0769 Lathe Motor Replacement Brushes:
P0768046
G0769 Mill Motor Replacement Brushes:
P0769786
6. Unscrew brush cap and carefully remove
brush from motor (see Figure 151).
7. Install new brush and re-install brush cap.
8. Repeat Steps 5–7 to replace bottom motor
brush.
9. Re-install motor with screws removed earlier.
10. Tension V-belts (refer to Tensioning V-Belts
on Page 81 for details).
11. Re-install back splash, electrical panel, and
end cover.
12. G0769 Only: Re-install cable harness onto
back splash with cable clamp.
Figure 150. Location of top motor brush cap
(Model G0768 shown).
Brush Cap
Figure 151. Top motor brush components
removed (Model G0768 shown).
Brush Cap
Brush
4. Remove motor mount cap screws (see Figure
149).
5. Rotate motor to access top motor brush
shown in Figure 150.
1. DISCONNECT MACHINE FROM POWER!
2. Remove end cover, electrical panel, and
back splash to access motor brushes.
Note: Carefully handle the electrical panel.
Try to avoid straining any wires so they do
not disconnect. On Model G0769 remove mill
motor cable harness and cable clamp from
back splash before removing it.
3. Loosen tensioner screw several turns (see
Figure 149) to remove tension on V-belts.
Replacing Lathe Motor Brushes
Figure 149. Motor mounting screws
(Model G0768 shown).
Tensioner
Screw
Motor Mount
Cap Screws
Model G0768/G0769 (Mfd. Since 8/15) -87-
3. Unscrew front brush cap and carefully remove
brush from motor (see Figure 153).
Figure 152. Location of mill motor cover screws.
Replacing Mill Motor Brushes (G0769)
1. DISCONNECT MACHINE FROM POWER!
2. Remove drawbar cap, then remove motor
cover by removing cap screws (see Figure
152).
Cap Screw
(1 of 4)
4. Install new brush and re-install brush cap.
5. Repeat Steps 3–4 to replace rear motor
brush.
6. Replace mill motor cover and drawbar cap.
Figure 153. Front motor brush components
removed.
Brush Cap
Brush
Drawbar
Cap
SHOCK HAZARD. Working on wiring that is con-
nected to a power source is extremely dangerous.
Touching electrified parts will result in personal
injury including but not limited to severe burns,
electrocution, or death. Disconnect the power
from the machine before servicing electrical com-
ponents!
MODIFICATIONS. Modifying the wiring beyond
what is shown in the diagram may lead to unpre-
dictable results, including serious injury or fire.
This includes the installation of unapproved after-
market parts.
WIRE CONNECTIONS. All connections must
be tight to prevent wires from loosening during
machine operation. Double-check all wires dis-
connected or connected during any wiring task to
ensure tight connections.
CIRCUIT REQUIREMENTS. You MUST follow
the requirements at the beginning of this manual
when connecting your machine to a power source.
WIRE/COMPONENT DAMAGE. Damaged wires
or components increase the risk of serious per-
sonal injury, fire, or machine damage. If you notice
that any wires or components are damaged while
performing a wiring task, replace those wires or
components.
MOTOR WIRING. The motor wiring shown in
these diagrams is current at the time of printing
but may not match your machine. If you find this
to be the case, use the wiring diagram inside the
motor junction box.
CAPACITORS/INVERTERS. Some capacitors
and power inverters store an electrical charge for
up to 10 minutes after being disconnected from
the power source. To reduce the risk of being
shocked, wait at least this long before working on
capacitors.
EXPERIENCING DIFFICULTIES. If you are expe-
riencing difficulties understanding the information
included in this section, contact our Technical
Support at (570) 546-9663.
Wiring Safety Instructions
The photos and diagrams
included in this section are
best viewed in color. You
can view these pages in
color at www.grizzly.com.
These pages are current at the time of printing. However, in the spirit of improvement, we may make chang-
es to the electrical systems of future machines. Compare the manufacture date of your machine to the one
stated in this manual, and study this section carefully.
If there are differences between your machine and what is shown in this section, call Technical Support at
(570) 546-9663 for assistance BEFORE making any changes to the wiring on your machine. An updated
wiring diagram may be available. Note: Please gather the serial
number and manufacture date of your
machine before calling. This information can be found on the main machine label.
SECTION 9: WIRING
-88- Model G0768/G0769 (Mfd. Since 8/15)
Model G0768/G0769 (Mfd. Since 8/15) -89-
G0768 Wiring Overview
JD-013
REV C 120823
Circuit Board
JD-014
REV 091111
Circuit
Board
DC Motor
Speed Control
JYMC-220B-II
Direction Switch
Fuses
and
Plug
Emergency Stop
DRO
RPM Sensor
(Inside)
Potentiometer
Motor (Inside)
110V 10A
Single-Phase
3⁄4 HP 5250 RPM
-90- Model G0768/G0769 (Mfd. Since 8/15)
G0768 Wiring
L2
A
F
F+ L1
A+
P1
P2
P3
To Plug
Fuse
F15al250V
Fuse
F10al250V
Neutral
Hot
Ground
110 VAC
5-15 Plug
(As Recommended)
JD-014 REV A 091111
SN121105
WX14-12
1k7±5
ZD-HAWK
RPM Sensor
DRO
J1
KEDU ZHA
EN61058
Left Side
KEDU ZHA
EN61058
Right Side
DIRECTION SWITCH
DIRECTION SWITCH
2
7
159
10 6
3
8 412
11
23
24
13
14
A1
KEDU
KJD17B
120V
Direction
Switch
Emergency
Stop
Rear Panel
(Viewed from Backside)
Front Panel
(Viewed From Backside)
Inside Electrical
Compartment
OUT/N
OUT/E
J
B
A
IN/N
IN/E
IN/L
JD-013 REV C 120823
IN/N
IN/N
OUT/L
OUT/L
OUT/N
J
IN/L
IN/L
A
GND
GND
GND
GND
Top Panel
(Viewed From Backside)
B
Potentiometer
Motor
110V 10A
Single Phase
3/4 HP
5250RPM
DC Motor Speed Control JYMC_220B-II
Model G0768/G0769 (Mfd. Since 8/15) -91-
G0768 Wiring Photos
Figure 154. Front panel.
Figure 157. Back panel.
Figure 156. RPM sensor.
Figure 155. Top panel.
-92- Model G0768/G0769 (Mfd. Since 8/15)
G0769 Wiring Overview
Mill Motor
(Inside)
110V 10A
Single-Phase
3⁄4 HP 4800 RPM
Lathe/Mill Selector Switch
Fuses and
Plug
Filter
Circuit Board
Direction
Switch
Potentiometer
Lathe Motor
(Inside)
110V 10A
Single-Phase
3⁄4 HP 5250 RPM
RPM Sensor
(Inside)
DRO
Emergency Stop
Speed
Control
Circuit Board
Model G0768/G0769 (Mfd. Since 8/15) -93-
G0769 Wiring
L2
AF
F+ L1
LL1
N1
J1
G
N
A+
B
A
1N
1N
P1 P2
P3
To Plug
Neutral
Hot
Ground
110 VAC
5-15 Plug
(As Recommended)
SPEED CONTROL
CIRCUIT BOARD
FILTER CIRCUIT BOARD
GND
SN130722
WX14-12
1k7±5
Lathe RPM
Sensor
DRO
Mill/Drill
Motor
J1
Lathe Motor Potentiometer
Lathe/Mill Drill
Selection Switch
110V 10A
Single Phase
3/4 HP
5250 RPM
110V 10A
Single Phase
3/4 HP
4800 RPM
KEDU ZHA
EN61058
Left Side
KEDU ZHA
EN61058
Right Side
DIRECTION SWITCH
DIRECTION SWITCH
10
7
15
26
3
8 4
12
11
23
24
13
14
A1
KEDU
KJD17B
120V
Direction
Switch
Emergency Stop
Top Panel
Rear Panel
(Viewed from Backside)
Front Panel
(Viewed From Backside)
Inside Electrical
Compartment
9
Fuse
F15al250V
Fuse
F10al250V
Fuse
F10al250V
SELECTION
SWITCH
Ui AC-11
440V 360VA
Ith10A
LW8-10/6
SELECTION
SWITCH
Ui AC-11
440V 360VA
Ith10A
LW8-10/6
10
12
ZD-HAWK
Mill RPM Sensor
J1
119
13 15
17 19
16 14
20 18
2321
2224
24
68
31
75
-94- Model G0768/G0769 (Mfd. Since 8/15)
G0769 Wiring Photos
Figure 158. Front panel. Figure 161. RPM sensor.
Figure 159. Top panel components.
Figure 160. Mill/drill motor.
Figure 162. Back panel.
1
2
3
4
5
6
7
8
9
10
11
12 13
14
14
15
16
17
18
7
19
20
21
22
23
25
25
26
26
27
30
31
32
33
34 35
36
37
38 38
39
39
40
40
41
41
42
42
43
44
45
46
47
48
50
Headstock
SECTION 10: PARTS
REF PART # DESCRIPTION REF PART # DESCRIPTION
1 P0768001 CAP SCREW M5-.8 X 25 25 P0768025 CAP SCREW M8-1.25 X 25
2 P0768002 FLAT WASHER 5MM 26 P0768026 FLAT WASHER 8MM
3 P0768003 MOTOR 600W 110VDC (G0768) 27 P0768027 HEX NUT M8-1.25
3 P0769003 MOTOR 600W 110VDC (G0769) 30 P0768030 END GEAR COVER (G0768)
4 P0768004 MOTOR PULLEY 30 P0769030 END GEAR COVER (G0769)
5 P0768005 KEY 4 X 4 X 20 31 P0768031 HEX NUT M10-1.5
6 P0768006 SET SCREW M6-1 X 8 32 P0768032 STUD-DE M10-1.5 X 90, 35
7 P0768007 V-BELT 5M375 GATES POLYFLEX (G0768) 33 P0768033 KNURLED KNOB M10-1.5
7P0769007 V-BELT 5M387 GATES POLYFLEX (G0769) 34 P0768034 SPANNER NUT M27 X 1
8 P0768008 MOTOR MOUNT (G0768) 35 P0768035 SPINDLE PULLEY
8P0769008 MOTOR MOUNT (G0769) 36 P0768036 GEAR 40T
9 P0768009 FLAT WASHER 8MM 37 P0768037 SPACER
10 P0768010 CAP SCREW M8-1.25 X 20 38 P0768038 CASTING SEAL
11 P0768011 MOUNT BLOCK 39 P0768039 TAPERED ROLLER BEARING 30206
12 P0768012 CAP SCREW M6-1 X 30 40 P0768040 GREASE SEAL
13 P0768013 TENSION ADJUSTMENT BLOCK 41 P0768041 CAP SCREW M4-.7 X 10
14 P0768014 CAP SCREW M6-1 X 20 42 P0768042 BLOCK, ROUND ENDS
15 P0768015 PIVOT BLOCK BOLT M8-1.25 X 35 43 P0768043 HEADSTOCK CASTING
16 P0768016 IDLER PIVOT BLOCK 44 P0768044 KEY 3 X 3 X 15
17 P0768017 FLAT WASHER 8MM 45 P0768045 SPINDLE W/INTRINSIC BACK PLATE
18 P0768018 HEX NUT M8-1.25 46 P0768046 MOTOR CARBON BRUSH 2-PC SET
19 P0768019 INT RETAINING RING 8MM 47 P0768047 MOTOR CARBON BRUSH CAP
20 P0768020 IDLER SHAFT 48 P0768048 POWER CORD 16G 3W 72" 5-15
21 P0768021 BALL BEARING 608ZZ 50 P0768050 ELECTRICAL SHROUD (G0768)
22 P0768022 IDLER PULLEY 50 P0769050 ELECTRICAL SHROUD (G0769)
23 P0768023 INT RETAINING RING 22MM
Model G0768/G0769 (Mfd. Since 8/15) -95-
Carriage Components & Accessories
101
102
103
104
105
106
107
108
109
109
110
111
112
113
114
115
116
117 117
118
119
120
123 123
124
126 180
126
127
127
128 129
130
131
131
132
133
134
134
135
136
155
141
142
144
145
146 147
149
151
152
154
150
138
156
157
158 159
160
161
162
163
164 165
166
176
178
179-1
179
167
168
169 170
171
172
173
177
G0769 Only
180
138
139
-96- Model G0768/G0769 (Mfd. Since 8/15)
Please Note: We do our best to stock replacement parts whenever possible, but we cannot guarantee that all parts shown here
are available for purchase. Call (800) 523-4777 or visit our online parts store at www.grizzly.com to check for availability.
Carriage Components & Accessories
REF PART # DESCRIPTION REF PART # DESCRIPTION
101 P0768101 TOOL POST HANDLE M5-.8 X 5 142 P0768142 CROSS SLIDE LEADSCREW
102 P0768102 TOOL POST HUB 144 P0768144 CROSS SLIDE HANDWHEEL
103 P0768103 TOOL POST FLAT WASHER 5MM, PLASTIC 145 P0768145 CROSS SLIDE GRADUATED DIAL
104 P0768104 STUD-DE M8-1.25 X 68, 18 146 P0768146 CAP SCREW M6-1 X 50
105 P0768105 TOOL HOLDER BOLT M6-1 X 25 147 P0768147 CROSS SLIDE LEADSCREW BRACKET
106 P0768106 INDENT PIN 149 P0768149 CAP SCREW M8-1.25 X 30
107 P0768107 COMPRESSION SPRING 150 P0768150 SADDLE CLAMP SLIDE (RR)
108 P0768108 COMPOUND REST 151 P0768151 STRAIGHT WAY WIPER
109 P0768109 HEX NUT M4-.7 152 P0768152 STRAIGHT WAY WIPER COVER
110 P0768110 CAP SCREW M4-.7 X 14 154 P0768154 CROSS SLIDE (G0768)
111 P0768111 COMPOUND REST GIB 154 P0769145 CROSS SLIDE (G0769)
112 P0768112 TOOL POST BODY 155 P0768155 SADDLE
113 P0768113 HEX BOLT M5-.8 X 30 156 P0768156 WRENCH 6 X 7MM OPEN-ENDS
114 P0768114 COMPOUND REST (G0768) 157 P0768157 WRENCH 8 X 10MM OPEN-ENDS
114 P0769114 COMPOUND REST (G0769) 158 P0768158 WRENCH 14 X 16MM OPEN-ENDS
115 P0768115 COMPOUND REST SWIVEL BASE 159 P0768159 SCREWDRIVER PHILLIPS #2
116 P0768116 COMPOUND REST LEADSCREW 160 P0768160 SCREWDRIVER FLAT #2
117 P0768117 KEY 3 X 3 X 12 161 P0768161 HEX WRENCH 8MM
118 P0768118 COMPOUND REST LEADSCREW BRACKET 162 P0768162 HEX WRENCH 6MM
119 P0768119 CAP SCREW M5-.8 X 12 163 P0768163 HEX WRENCH 5MM
120 P0768120 COMPOUND REST GRADUATED DIAL 164 P0768164 HEX WRENCH 4MM
123 P0768123 CURVED PLATE 165 P0768165 HEX WRENCH 3MM
124 P0768124 COMPOUND REST HANDWHEEL 166 P0768166 SPANNER WRENCH
126 P0768126 HANDWHEEL HANDLE 167 P0768167 TOOL POST WRENCH 8MM SQUARE
127 P0768127 SHOULDER SCREW E116, 53 168 P0768168 LATHE CHUCK KEY 8MM STD
128 P0768128 CAP SCREW M4-.7 X 8 169 P0768169 FACEPLATE 6-3/4"
129 P0768129 SET SCREW M5-.8 X 10 170 P0768170 3-JAW CHUCK 4"
130 P0768130 BUSHING 171 P0768171 3-JAW CHUCK EXTERNAL JAW SET
131 P0768131 BALL OILER 5MM PRESS-IN 172 P0768172 DEAD CENTER MT#3
132 P0768132 CAP SCREW M4-.7 X 20 173 P0768173 DEAD CENTER MT#2
133 P0768133 CROSS SLIDE GIB 176 P0768176 TOOLBOX
134 P0768134 PHLP HD SCR M3-.5 X 10 177 P0768177 4-JAW CHUCK 4" W/KEY
135 P0768135 V-WAY WIPER COVER 178 P0769178 DRILL CHUCK ARBOR MT#2 X B16 (G0769)
136 P0768136 V-WAY WIPER 179 P0769179 DRILL CHUCK B16 1-13MM W/KEY (G0769)
138 P0768138 CAP SCREW M5-.8 X 10 179-1 P0769179-1 DRILL CHUCK KEY 8MM STD 11 SD-16MM (G0769)
139 P0768139 SADDLE CLAMP SLIDE (FR) 180 P0768180 LOCK NUT M8-1.25
141 P0768141 CROSS SLIDE LEADSCREW NUT
Model G0768/G0769 (Mfd. Since 8/15) -97-
Steady & Follow Rest
REF PART # DESCRIPTION REF PART # DESCRIPTION
174 P0768174 STEADY REST ASSEMBLY 175 P0768175 FOLLOW REST ASSEMBLY
174-1 P0768174-1 HEX NUT M8-1.25 175-1 P0768175-1 HEX NUT M8-1.25
174-2 P0768174-2 LOCK WASHER 8MM 175-2 P0768175-2 LOCK WASHER 8MM
174-3 P0768174-3 STEADY REST 175-3 P0768175-3 FOLLOW REST
174-4 P0768174-4 STEADY REST FINGER 175-4 P0768175-4 ADJUSTING SCREW
174-5 P0768174-5 ADJUSTING SCREW 175-5 P0768175-5 FOLLOW REST FINGER
174-6 P0768174-6 T-BOLT M8-1.25 X 26 175-6 P0768175-6 T-BOLT M8-1.25 X 26
174
174-1
174-2
174-3
174-4
174-5
174-6
175
175-1
175-2
175-3
175-4
175-5
175-6
-98- Model G0768/G0769 (Mfd. Since 8/15)
Apron
REF PART # DESCRIPTION REF PART # DESCRIPTION
202 P0768202 LOCK NUT M8-1.25 220 P0768220 SUPPORT BAR
203 P0768203 CARRIAGE HANDWHEEL (G0768) 221 P0768221 SET SCREW M6-1 X 8
203 P0769203 CARRIAGE HANDWHEEL (G0769) 222 P0768222 COMPRESSION SPRING 0.6 X 3.5 X 12
204 P0768204 CURVED PLATE 223 P0768223 STEEL BALL 4.5MM
205 P0768205 CAP SCREW M5-.8 X 10 224 P0768224 CAP SCREW M4-.7 X 12
206 P0768206 CARRIAGE GRADUATED DIAL 225 P0768225 HEX NUT M4-.7
207 P0768207 HANDWHEEL BRACKET 226 P0768226 HALF NUT SHAFT
208 P0768208 CAP SCREW M8-1.25 X 25 227 P0768227 ROLL PIN 3 X 30
209 P0768209 SET SCREW M5-.8 X 8 228 P0768228 HALF NUT LEVER HUB
210 P0768210 APRON 229 P0768229 SET SCREW M5-.8 X 6
211 P0768211 KEY 3 X 3 X 8 230 P0768230 HALF NUT LEVER M5-.8 X 5
212 P0768212 GEAR SHAFT 14T 231 P0768231 HANDWHEEL HANDLE M5-.8 X 8
213 P0768213 SHAFT 232 P0768232 HALF NUT MOUNT
214 P0768214 COMBO GEAR 44/21T 233 P0768233 THREAD DIAL BUSHING
215 P0768215 SET SCREW M4-.7 X 35 234 P0768234 THREAD DIAL INDICATOR
216 P0768216 HEX NUT M4-.7 235 P0768235 CAP SCREW M4-.7 X 10
217 P0768217 HALF NUT 2-PC SET 236 P0768236 THREAD DIAL BODY
218 P0768218 DOWEL PIN 4 X 10 237 P0768237 CAP SCREW M6-1 X 35
219 P0768219 CAP SCREW M4-.7 X 10 238 P0768238 COMBO GEAR 32T
202 203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226 227
228
229
230
231
232
233
234
235
236
237
238
Model G0768/G0769 (Mfd. Since 8/15) -99-
Gearbox
REF PART # DESCRIPTION REF PART # DESCRIPTION
301 P0768301 DIRECTION INDICATOR PLATE 322 P0768322 SHAFT (G0768)
302 P0768302 SET SCREW M6-1 X 10 322 G0769322 SHAFT (G0769)
303 P0768303 COMPRESSION SPRING 0.8 X 4 X 16 323 P0768323 SET SCREW M4-.7 X 8
304 P0768304 STEEL BALL 5MM 324 P0768324 COMBO GEAR 30/30T
305 P0768305 DIRECTION KNOB 325 P0768325 COMBO GEAR 30/30T W/FLANGE
306 P0768306 SHAFT BRACKET 326 P0768326 KEY 4 X 4 X 40
307 P0768307 CAP SCREW M3-.5 X 6 327 P0768327 SHAFT (G0768)
308 P0768308 GEARBOX FRONT PANEL (G0768) 327 P0769327 SHAFT (G0769)
308 P0769308 GEARBOX FRONT PANEL (G0769) 328 P0768328 BALL BEARING 6201-2RZ
309 P0768309 CAP SCREW M5-.8 X 16 329 P0768329 COUPLER
310 P0768310 GEARBOX FRONT COVER (G0768) 332 P0768332 CAP SCREW M5-.8 X 12
310 P0769310 GEARBOX FRONT COVER (G0769) 333 P0768333 BEARING FLANGE
311 P0768311 SHAFT 334 P0768334 ROLL PIN 5 X 22
312 P0768312 ROCKER ARM 335 P0768335 CAP SCREW M6-1 X 16
313 P0768313 GEAR 30T 336 P0768336 FLAT WASHER 6MM
314 P0768314 SHAFT (G0768) 337 P0768337 SHAFT
314 P0769314 SHAFT (G0769) 338 P0768338 GEAR 30T
315 P0768315 BALL BEARING 6201-2RZ 339 P0768339 EXT RETAINING RING 14MM
316 P0768316 BEARING FLANGE 340 P0768340 BUSHING
317 P0768317 CAP SCREW M5-.8 X 12 341 P0768341 SHIFTING FORK
318 P0768318 EXT RETAINING RING 12MM 342 P0768342 ROLL PIN 4 X 20
319 P0768319 KEY 3 X 3 X 6 343 P0768343 SET SCREW M5-.8 X 12
320 P0768320 KEY 4 X 4 X 28 344 P0768344 FLAT HD CAP SCR M4-.7 X 12
321 P0768321 GEARBOX CASTING (G0768) 345 P0768345 SET SCREW M4-.7 X 6
321 P0769321 GEARBOX CASTING (G0769) 346 P0768346 SET SCREW M8-1.25 X 8
301
302
303
304
305
306
307
308 309
310
311
312
313
314
315
316
317
318
319
320
321 346
322
323
324
325
326
327 328
329
332
333
334
335
336
337
338
339
340
341
342
343
344
345
-100 - Model G0768/G0769 (Mfd. Since 8/15)
Bed & End Gears
REF PART # DESCRIPTION REF PART # DESCRIPTION
401 P0768401 EXT RETAINING RING 8MM 422 P0768422 THRUST BEARING 51100
402 P0768402 GEAR 84T 423 P0768423 LEADSCREW BRACKET (RH)
403 P0768403 GEAR 30T 424 P0768424 COUPLING NUT M8-1.25 X 20
404 P0768404 BUSHING 425 P0768425 SET SCREW M4-.7 X 12
405 P0768405 THREADED SHAFT 428 P0768428 GEAR 33T
406 P0768406 SHAFT RETAINER M8-1.25 429 P0768429 GEAR 40T
407 P0768407 GEAR 20T 430 P0768430 GEAR 50T
408 P0768408 GEAR 80T 431 P0768431 GEAR 53T
409 P0768409 HEX NUT M10-1.5 432 P0768432 GEAR 55T
410 P0768410 FLAT WASHER 10MM 433 P0768433 GEAR 57T
411 P0768411 BUSHING 434 P0768434 GEAR 60T
412 P0768412 PIVOT ARM 435 P0768435 GEAR 63T
413 P0768413 CAP SCREW M6-1 X 35 436 P0768436 GEAR 65T
414 P0768414 BUSHING 437 P0768437 BACK SPLASH (G0768)
416 P0768416 CAP SCREW M6-1 X 14 437 P0769437 BACK SPLASH (G0769)
418 P0768418 LONGITUDINAL LEADSCREW (G0768) 438 P0768438 CHIP PAN (G0768)
418 P0769418 LONGITUDINAL LEADSCREW (G0769) 438 P0769438 CHIP PAN (G0769)
419 P0768419 BED (G0768) 439 P0768439 GEAR 70T
419 P0769419 BED (G0769) 440 P0768440 GEAR 71T
420 P0768420 RACK 441 P0768441 GEAR 72T
421 P0768421 CAP SCREW M2-.4 X 12
401 401 402
403
404
405
406
404
405
406
407 408
408
409
410
411
412
413
414
416
418
419
438
437
420
421
422
422
423
424
425
428
429
430
431
432
433
434
435
436
439 440 441
Model G0768/G0769 (Mfd. Since 8/15) -101-
Tailstock
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
518
519
520
521
522
523
524
525
526
527
528
529
530
535
534
532
533
531
REF PART # DESCRIPTION REF PART # DESCRIPTION
501 P0768501 SHOULDER SCREW M5-.8 X 6 519 P0768519 QUILL LOCK HUB
502 P0768502 HANDWHEEL HANDLE 520 P0768520 QUILL LOCK PLUNGER
503 P0768503 COUPLING NUT M6-1 521 P0768521 QUILL
504 P0768504 QUILL HANDWHEEL (G0768) 522 P0768522 TAILSTOCK CASTING
504 P0769504 QUILL HANDWHEEL (G0769) 523 P0768523 SET SCREW M8-1.25 X 25
505 P0768505 CURVED PLATE 524 P0768524 LOCK BLOCK
506 P0768506 QUILL GRADUATED DIAL 525 P0768525 HEX NUT M8-1.25
507 P0768507 CAP SCREW M4-.7 X 12 526 P0768526 TAILSTOCK BASE
508 P0768508 BEARING FLANGE 527 P0768527 CLAMP PLATE
509 P0768509 THRUST BEARING 51100 528 P0768528 FLAT WASHER 8MM
510 P0768510 QUILL LEADSCREW 529 P0768529 HEX BOLT M8-1.25 X 40
511 P0768511 KEY 4 X 4 X 12 530 P0768530 OFFSET PLATE, TOP
512 P0768512 STUD-SE M6-1 X 30, 10 531 P0768531 SET SCREW M5-.8 X 8
513 P0768513 TAILSTOCK LOCK LEVER M8-1.25 532 P0768532 SET SCREW M8-1.25 X 25
514 P0768514 ECCENTRIC SHAFT 533 P0768533 SET SCREW M6-1 X 6 CONE-PT
515 P0768515 BALL OILER 6MM PRESS-IN 534 P0768534 RIVET 2 X 5
516 P0768516 SET SCREW M5-.8 X 8 535 P0768534 OFFSET PLATE, BOTTOM
518 P0768518 QUILL LOCK LEVER M6-1 X 5
-102- Model G0768/G0769 (Mfd. Since 8/15)
G0769 Mill Column
REF PART # DESCRIPTION REF PART # DESCRIPTION
601 P0769601 MILL HEADSTOCK MOUNT 611 P0769611 SHOULDER SCREW M5-.8 X 55, 10
602 P0769602 Z-AXIS GIB 612 P0769612 KEY 4 X 4 X 20
603 P0769603 GIB ADJUSTMENT SCREW 613 P0769613 HANDWHEEL HANDLE
604 P0769604 COLUMN 614 P0769614 Z-AXIS LEADSCREW NUT
605 P0769605 COLUMN TOP COVER 615 P0769615 Z-AXIS LEADSCREW
606 P0769606 CAP SCREW M6-1 X 25 616 P0769616 CAP SCREW M8-1.25 X 40
607 P0769607 LOCK NUT M6-1 617 P0769617 LOCK WASHER 8MM
608 P0769608 Z-AXIS HANDWHEEL 618 P0769618 FLAT WASHER 8MM
609 P0769609 Z-AXIS GRADUATED DIAL 619 P0769619 COLUMN BASE
610 P0769610 THRUST BEARING 51201 620 P0769620 ROLL PIN 6 X 25
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
616
620
617
617
618
618
619
Model G0768/G0769 (Mfd. Since 8/15) -103-
G0769 Mill Headstock
786
787
701
702
703
704
705
706
707
708
709
710
710
711
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
736
737
738
739 740
740
741
742
743 743
744
745
746
747
748
748
749
750
751
788
752 753
755
756
757
758
759
760
761
762
763
764
765
767
768
769
770
771
772
773
774
775
777
778
782
783
784
785
-104- Model G0768/G0769 (Mfd. Since 8/15)
G0769 Mill Headstock
REF PART # DESCRIPTION REF PART # DESCRIPTION
701 P0769701 ALIGNMENT WASHER 744 P0769744 FINE DOWNFEED GRADUATED DIAL
702 P0769702 BUSHING 745 P0769745 WORM SHAFT
703 P0769703 COMPRESSION SPRING 2.5 X 28 X 100 746 P0769746 SPINDLE MT#2
704 P0769704 EXT RETAINING RING 45MM 747 P0769747 QUILL SEAL, RUBBER (LOWER)
705 P0769705 BALL BEARING 6909ZZ 748 P0769748 TAPERED ROLLER BEARING 32005
706 P0769706 COMBO GEAR 53T/65T 749 P0769749 MILL QUILL
707 P0769707 ANGULAR CONTACT BEARING 6007RZ 750 P0769750 QUILL SEAL 58 X 2.65, RUBBER (UPPER)
708 P0769708 EXT RETAINING RING 15MM 751 P0769751 PRELOAD ADJUSTMENT NUT
709 P0769709 GEAR 37T 752 P0769752 WORM HOUSING
710 P0769710 EXT RETAINING RING 32MM 753 P0769753 HEX BOLT M6-1 X 25
711 P0769711 BALL BEARING 6002ZZ 755 P0769755 COARSE DOWNFEED LEVER M10-1.5 X 14
712 P0769712 COMBO GEAR 39T/51T 756 P0769756 KNOB BOLT M6-1 X 30
713 P0769713 SHAFT 757 P0769757 COARSE DOWNFEED HUB
714 P0769714 KEY 5 X 5 X 50 758 P0769758 COARSE DOWNFEED GRADUATED DIAL
715 P0769715 KEY 5 X 5 X 12 759 P0769759 COMPRESSION SPRING 1.2 X 12 X 2.5
716 P0769716 FORK 760 P0769760 CAP SCREW M4-.7 X 40
717 P0769717 FORK ARM 761 P0769761 FLANGE
718 P0769718 CAP SCREW M8-1.25 X 8 762 P0769762 BUSHING
719 P0769719 DRAWBAR COVER 763 P0769763 WORM GEAR
720 P0769720 MOTOR COVER 764 P0769764 KEY 4 X 4 X 12
721 P0769721 MILL MOTOR 600W 110V DC 765 P0769765 GEAR SHAFT 16T
722 P0769722 FLAT WASHER 4MM 767 P0769767 HI/LO INDICATOR PLATE
723 P0769723 CAP SCREW M4-.7 X 8 768 P0769768 SET SCREW M8-1.25 X 8
724 P0769724 CAP SCREW M6-1 X 14 769 P0769769 COMPRESSIONS SPRING 0.8 X 5 X 25
725 P0769725 L-BRACKET 770 P0769770 STEEL BALL 6.5MM
726 P0769726 SPEED SENSOR 771 P0769771 HI/LO HANDWHEEL
727 P0769727 MOTOR MOUNT 772 P0769772 SET SCREW M5-.8 X 16
728 P0769728 CAP SCREW M5-.8 X 12 773 P0769773 SPEED KNOB PLATE
729 P0769729 SPACER 10MM 774 P0769774 FORK SHAFT FLANGE
730 P0769730 GEAR 25T 775 P0769775 FORK SHAFT
731 P0769731 KEY 4 X 4 X 6 777 P0769777 SPINDLE RING 16MM
732 P0769732 HEADSTOCK FRONT PANEL 778 P0769778 HEX BOLT M3-.5 X 8
736 P0769736 ADJUSTABLE HANDLE M8-1.25 X 20 782 P0769782 HEX BOLT M3-.5 X 6
737 P0769737 LOCK PLUNGER, BRASS 783 P0769783 SPEED SENSOR CORD
738 P0769738 MILL HEADSTOCK CASTING 784 P0769784 HEX BOLT M3-.5 X 6
739 P0769739 HEADSTOCK REAR COVER 785 P0769785 DRAWBAR 3/8-16 X 8-1/2
740 P0769740 CAP SCREW M4-.7 X 8 786 P0769786 MOTOR CARBON BRUSH 2-PC SET
741 P0769741 FINE DOWNFEED KNOB 787 P0769787 MOTOR CARBON BRUSH CAP
742 P0769742 SET SCREW M5-.8 X 6 788 P0769788 PRELOAD ADJUSTMENT SCREW M5-.8 X 10
743 P0769743 HANDWHEEL CURVED PLATE SPRING
Model G0768/G0769 (Mfd. Since 8/15) -105-
701 702
703
713
704
705
706
707
708
709
710
711
712
G0768 Labels & Cosmetics
REF PART # DESCRIPTION REF PART # DESCRIPTION
701 P0768701 FEED RATE CHART LABEL 708 P0768708 SPINDLE SPEED HAZARD LABEL
702 P0768702 COMBO WARNING LABEL 709 P0768709 GEARBOX LABEL
703 P0768703 GENERAL WARNINGS LABEL 710 P0768710 SPECIFICATIONS LABEL
704 P0768704 VARIABLE SPEED LABEL 711 P0768711 ELECTRICITY LABEL
705 P0768705 GRIZZLY PUTTY TOUCH-UP PAINT 712 P0768712 PINCH/ENTANGLEMENT WARNING LABEL
706 P0768706 GRIZZLY GREEN TOUCH-UP PAINT 713 P0768713 OVERHEATING MOTOR NOTICE LABEL
707 P0768707 THREAD DIAL CHART
Safety labels help reduce the risk of serious injury caused by machine hazards. If any label comes
off or becomes unreadable, the owner of this machine MUST replace it in the original location
before resuming operations. For replacements, contact (800) 523-4777 or www.grizzly.com.
-106 - Model G0768/G0769 (Mfd. Since 8/15)
801
802
803
804
805
806
807
808
809 810
815
811
G0769 Labels & Cosmetics
REF PART # DESCRIPTION REF PART # DESCRIPTION
801 P0769801 MACHINE ID LABEL 809 P0769809 SPINDLE SPEED HAZARD LABEL
802 P0769802 GRIZZLY PUTTY TOUCH-UP PAINT 810 P0769810 COMBO WARNING LABEL
803 P0769803 THREAD DIAL CHART 811 P0769811 GRIZZLY LOGO LABEL (RED)
804 P0769804 GRIZZLY GREEN TOUCH-UP PAINT 812 P0769812 LOW/HI SPEED LABEL
805 P0769805 FEED DIRECTION LABEL 813 P0769813 ENTANGLEMENT HAZARD LABEL
806 P0769806 CONTROL PANEL LABEL 814 P0769814 ELECTRICITY LABEL
807 P0769807 GEAR CONFIGURATION CHART LABEL 815 P0769815 OVERHEATING MOTOR NOTICE LABEL
808 P0769808 DISCONNECT POWER WARNING LABEL
Safety labels help reduce the risk of serious injury caused by machine hazards. If any label comes
off or becomes unreadable, the owner of this machine MUST replace it in the original location
before resuming operations. For replacements, contact (800) 523-4777 or www.grizzly.com.
812
813
814
812
813
814
812
813
814
Model G0768/G0769 (Mfd. Since 8/15) -107-
G0768 Electrical Component Diagram
Inside Electrical
Compartment
Top Panel
902
903 905
906
908
909
910
904
Rear Panel
*
912 907
*
Front Panel
911
-108- Model G0768/G0769 (Mfd. Since 8/15)
REF PART # DESCRIPTION REF PART # DESCRIPTION
902 P0768902 E-STOP KEDU JD17B 120V 908 P0768908 SPEED CONTROL CIRCUIT BOARD
903 P0768903 ROTARY SWITCH KEDU ZHA EN61058 909 P0768909 FILTER CIRCUIT BOARD
904 P0768904 DRO CIRCUIT BOARD 910 P0768910 RPM SENSOR
905 P0768905 POTENTIOMETER WX14-12 1K7 911 P0768911 FUSE 10A 250V FAST-ACTING GLASS
906 P0768906 FUSE 15A 250V FAST-ACTING GLASS 912 P0768912 FUSE HOLDER MF528 10A 250V
907 P0768907 FUSE HOLDER MF528 15A 250V
G0769 Electrical Component Diagram
Inside Electrical
Compartment
*
Top Panel
901
902
903 905
912 906
908
911
909
910
904
Rear Panel
*
912 907
*
910
Front Panel
911
REF PART # DESCRIPTION REF PART # DESCRIPTION
901 P0769901 ROTARY SWITCH LW8-10/6 907 P0769907 FUSE HOLDER MF528 15A 250V
902 P0769902 E-STOP KEDU JD17B 120V 908 P0769908 SPEED CONTROL CIRCUIT BOARD
903 P0769903 ROTARY SWITCH KEDU ZHA EN61058 909 P0769909 FILTER CIRCUIT BOARD
904 P0769904 DRO CIRCUIT BOARD 910 P0769910 RPM SENSOR
905 P0769905 POTENTIOMETER WX14-12 1K7 911 P0769911 FUSE 10A 250V FAST-ACTING GLASS
906 P0769906 FUSE 15A 250V FAST-ACTING GLASS 912 P0769912 FUSE HOLDER MF528 10A 250V
Model G0768/G0769 (Mfd. Since 8/15) -109-
INDICATOR TABLE
9 1-8
1-8
1-8
1-8
1, 4, 7
12
18
24
All Others
TPI SCALE
Thread Dial Chart
-110 - Model G0768/G0769 (Mfd. Since 8/15)
SECTION 11: APPENDIX
Threading & Feeding
Chart
0.0071"
0.0037"
84
20
A
A
40
in/
mm
n/1"
C
C
DD
BB
E
E
F
A
C D
B
E F
A
C D
B
E F
F
80 80
0.40
1.25 1.50 1.75 2.00 2.50 3.00
55
80
80
53
71 71 63
57
71 7163 33 30 60 40 40
506084805060
20
80 80
80 63 63
80
60 70
70
70
57 72 80
80
30 33 53 30 60 40 40 4030 3370
0.50 0.60 0.70 0.80 1.00
80
30 72
33 80
30
0.0068"
A
C D
B
E F
A
C D
B
E F
30
19 20 22 24 32 40 44
80 80
30 33 40 65 70 80 60
6060 60 63
63
53
910 11 12 13 14 16 18
50 50 55
80
80 80 80 80
80 60
60
71 53 55 33 3055 5540 30
53 53 53 72 63 70
57 57 72 72
7272 80 70 40 40 40
63 5755
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Name _____________________________________________________________________________
Street _____________________________________________________________________________
City _______________________ State _________________________ Zip _____________________
Phone # ____________________ Email _________________________________________________
Model # ____________________ Order # _______________________ Serial # __________________
WARRANTY CARD
The following information is given on a voluntary basis. It will be used for marketing purposes to help us develop
better products and services. Of course, all information is strictly confidential.
1. How did you learn about us?
____ Advertisement ____ Friend ____ Catalog
____ Card Deck ____ Website ____ Other:
2. Which of the following magazines do you subscribe to?
3. What is your annual household income?
____ $20,000-$29,000 ____ $30,000-$39,000 ____ $40,000-$49,000
____ $50,000-$59,000 ____ $60,000-$69,000 ____ $70,000+
4. What is your age group?
____ 20-29 ____ 30-39 ____ 40-49
____ 50-59 ____ 60-69 ____ 70+
5. How long have you been a woodworker/metalworker?
____ 0-2 Years ____ 2-8 Years ____ 8-20 Years ____20+ Years
6. How many of your machines or tools are Grizzly?
____ 0-2 ____ 3-5 ____ 6-9 ____ 10+
7. Do you think your machine represents a good value? _____Yes _____No
8. Would you recommend Grizzly Industrial to a friend? _____Yes _____No
9. Would you allow us to use your name as a reference for Grizzly customers in your area?
Note: We never use names more than 3 times. _____Yes _____No
10. Comments: _____________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
_________________________________________________________________________________
____ Cabinetmaker & FDM
____ Family Handyman
____ Hand Loader
____ Handy
____ Home Shop Machinist
____ Journal of Light Cont.
____ Live Steam
____ Model Airplane News
____ Old House Journal
____ Popular Mechanics
____ Popular Science
____ Popular Woodworking
____ Precision Shooter
____ Projects in Metal
____ RC Modeler
____ Rie
____ Shop Notes
____ Shotgun News
____ Today’s Homeowner
____ Wood
____ Wooden Boat
____ Woodshop News
____ Woodsmith
____ Woodwork
____ Woodworker West
____ Woodworker’s Journal
____ Other:
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GRIZZLY INDUSTRIAL, INC.
P.O. BOX 2069
BELLINGHAM, WA 98227-2069
Place
Stamp
Here
Name_______________________________
Street_______________________________
City______________State______Zip______
Send a Grizzly Catalog to a friend:
WARRANTY & RETURNS
Grizzly Industrial, Inc. warrants every product it sells for a period of 1 year to the original purchaser from
the date of purchase. This warranty does not apply to defects due directly or indirectly to misuse, abuse,
negligence, accidents, repairs or alterations or lack of maintenance. This is Grizzly’s sole written warranty
and any and all warranties that may be implied by law, including any merchantability or fitness, for any par-
ticular purpose, are hereby limited to the duration of this written warranty. We do not warrant or represent
that the merchandise complies with the provisions of any law or acts unless the manufacturer so warrants.
In no event shall Grizzly’s liability under this warranty exceed the purchase price paid for the product and
any legal actions brought against Grizzly shall be tried in the State of Washington, County of Whatcom.
We shall in no event be liable for death, injuries to persons or property or for incidental, contingent, special,
or consequential damages arising from the use of our products.
To take advantage of this warranty, contact us by mail or phone and give us all the details. We will then issue
you a “Return Number,’’ which must be clearly posted on the outside as well as the inside of the carton. We
will not accept any item back without this number. Proof of purchase must accompany the merchandise.
The manufacturers reserve the right to change specifications at any time because they constantly strive to
achieve better quality equipment. We make every effort to ensure that our products meet high quality and
durability standards and we hope you never need to use this warranty.
Please feel free to write or call us if you have any questions about the machine or the manual.
Thank you again for your business and continued support. We hope to serve you again soon.

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