MODEL T10808
WOOD LATHE CHUCK SET
INSTRUCTIONS
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Introduction
Inventory
Description:
The T10808 23⁄4" Wood Lathe Chuck Set includes
a scroll chuck with four self-centering bottom jaws
and five top jaw sets to provide a variety of grip-
ping needs for your wood turning projects.
Qty
A. T-Handle Hex Wrench 3mm....................... 1
B. Spindle Lever 8mm .................................... 1
C. Woodworm Screw ...................................... 1
D. Lathe Chuck Key 8mm............................... 1
E. Chuck Body................................................ 1
F. Pin Jaws..................................................... 4
G. #2 Round Jaws........................................... 4
H. Grip Studs 18mm, M6-1 x 6 ....................... 8
I. Flat Jaws .................................................... 4
J. #1 Step Jaws.............................................. 4
K. Grip Studs 13mm, M6-1 x 6 ....................... 8
L. Cap Screws M4-.7 x 8................................ 8
M. #3 Round Jaws........................................... 4
N. Hex Wrench 4mm....................................... 1
Specifications
Chuck Body Diameter ...................................23⁄4
"
Chuck Bore...........................................1" x 8 TPI
Outside Grip Range:
— #1 Step Jaws .............................. 3⁄32" – 5⁄8
— #2 Round Jaws ......................... 11⁄8"–13⁄4
— #3 Round Jaws .........................21⁄4"–23⁄8
— Pin Jaws.........................................1⁄4" – 7⁄8
Inside Grip Range:
"
"
"
"
— #1 Step Jaws (Upper Step)..........3⁄4"–11⁄4
— #1 Step Jaws (Lower Step).......11⁄2"–21⁄8
— #2 Round Jaws .........................11⁄2"–21⁄8
— #3 Round Jaws .........................27⁄8"–33⁄8
— Pin Jaws....................................15⁄16"–11⁄2
Flat Jaws Maximum Outside Diameter ........ 43⁄8
"
"
"
"
"
"
D
E
C
B
A
Flat Jaws Minimum Inside Diameter ............21⁄16"
Woodworm Screw Required Hole ...........1⁄4" x 7⁄8
F
H
G
"
I
N
To prevent personal injury, always under-
stand and follow all safety instructions in
your wood lathe owner's manual.
K
J
M
L
COPYRIGHT © DECEMBER, 2013 BY GRIZZLY INDUSTRIAL, INC.
NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
#TS16132 PRINTED IN CHINA
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Safety for Chucks
ENTANGLEMENT. Entanglement with a rotat- PROPER MAINTENANCE. All chucks must be
ing chuck can lead to death, amputation, broken properly maintained and lubricated to achieve
bones, or other serious injury. Never attempt to maximum clamping force and withstand the rigors
slow or stop the lathe chuck by hand, and always of centrifugal force. To reduce the risk of a thrown
roll up long sleeves, tie back long hair, and remove workpiece, follow all maintenance intervals and
any jewelry or loose apparel BEFORE operating.
instructions in this document.
CHUCK SPEED RATING. Excessive spindle DISCONNECT POWER. Serious entanglement or
speeds greatly increase the risk of the workpiece impact injuries could occur if the lathe is started
or chuck being thrown from the machine with while you are adjusting, servicing, or installing the
deadly force. Never use spindle speeds faster than chuck. Always disconnect the lathe from power
the safe limits of your chuck and workpiece.
before performing these procedures.
USING CORRECT EQUIPMENT.
Many TOP JAW TYPES. Mixing top jaw types will create
workpieces can only be safely turned in a lathe if an unbalanced and off-center load that could fly
additional support equipment, such as a tailstock from the lathe and cause personal injury or prop-
center, is used. If the operation is too hazardous erty damage. Use all four top jaws of the same
to be completed with the lathe or existing equip- type when securing workpiece.
ment, the operator must have enough experience
to know when to use a different machine or find a POWER TOOLS. Do not use power tools on cap
safer way.
screws or grip studs, which can easily damage the
threads and cause the component to fail during
TRAINED OPERATORS ONLY. Using a chuck operation. A workpiece or chuck component not
incorrectly can result in workpieces coming properly secured can fly off during operation and
loose at high speeds and striking the operator or cause serious personal injury.
bystanders with deadly force. To reduce the risk of
this hazard, read and understand this document TENON/RECESS SIZE. Size the tenon or recess
and seek additional training from an experienced properly and choose the correct jaw configuration
chuck user before using a chuck.
so that there is the greatest possible amount of
surface contact between jaws and workpiece. The
CHUCK CAPACITY. Avoid exceeding the capac- greater the surface contact, the greater the grip-
ity of the chuck by clamping an oversized work- ping power!
piece. If the workpiece is too large to safely clamp
with the chuck, use a faceplate or a larger chuck FLAT JAWS. Flat jaws (or cole jaws) provide the
if possible. Otherwise, the workpiece could be least gripping power of the jaw types. Always use
thrown from the lathe during operation, resulting in slow speeds when using flat jaws.
serious impact injury or death.
SAFETY SET SCREW. The safety set screw
CLAMPING FORCE. Inadequate clamping force under bottom jaw #4 prevents the jaws from mov-
can lead to the workpiece being thrown from the ing beyond safe engagement with the scroll gear.
chuck and striking the operator or bystanders. If this should happen, the jaws and workpiece
Maximum clamping force is achieved when the could fly off the chuck during operation resulting
chuck is properly maintained and lubricated, all in serious personal injury to operator or bystand-
jaws are fully engaged with the workpiece, and ers. Always make sure this set screw is properly
the maximum chuck clamping diameter is not installed and tightened when using the chuck.
exceeded.
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Mounting Jaws
1. Clean top and bottom jaws with mineral spir-
its. When dry, apply a thin coat of ISO 32 or
equivalent oil to the mating surfaces.
The safety set screw under bottom jaw
#4 (shown below) prevents the jaws from
moving beyond safe engagement with the
scroll gear. Unsecured jaws could fly off the
chuck during operation resulting in serious
personal injury to operator or bystanders.
Always make sure this set screw is prop-
erly installed and tightened when using the
chuck.
2. Place top jaws on bottom jaws so alignment
rings (see example below) fit into alignment
slots and screw holes are aligned.
Note: Make sure stamped numbers of chuck
jaw guide, bottom jaw, and top chuck corre-
spond with each other to ensure jaws safely
and evenly grip workpiece.
Jaw on Side
for Clarity
Alignment
Safety
Set Screw
Ring
Mounting Chuck
It is important that the chuck is properly mounted
to the lathe to ensure safe and accurate turning
(see the example below).
Alignment Slot
3. Apply a thin coat of ISO 32 or equivalent oil
to cap screw threads to prevent screws from
seizing under operational forces.
4. Thread the cap screws through the top jaws
into the bottom jaws and finger tighten them,
then back them off 1⁄4 turn.
5. Use chuck key to converge jaws to the center
so they are evenly up against one another
and even in height.
6. Fully tighten cap screws—do not overtighten.
7. Check jaw alignment. They should be evenly
up against one another with no gaps and
even in height.
—If this is not the case, repeat this procedure
until they are.
-4-
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To mount the chuck onto the lathe:
Chuck Types
The best jaw type to use is the one that will pro-
vide the greatest contact between the jaw and the
workpiece—this provides the best gripping power!
1. DISCONNECT LATHE FROM POWER!
2. Thoroughly clean threads of spindle and
chuck bore with mineral spirits and a stiff
brush.
Round Jaws
Round jaws (or dovetail jaws) are typically either
closed around a tenon (or foot) turned on the bot-
tom of a bowl, or they are expanded into a recess
cut into the workpiece. The tenon is later removed
with the workpiece mounted on the flat jaws.
3. Properly mount top jaws onto bottom jaws.
4. To prevent chuck binding to spindle under
operational forces, apply a thin coat of ISO
32 or equivalent oil to spindle threads.
A dowel workpiece can also be fed through the
center of the chuck and spindle bore, and gripped
with center surfaces of the jaw flats. As each
piece is turned and cut off, the dowel can be
advanced for the next piece.
5. Thread chuck onto spindle and hand tighten.
It should screw on without binding or exces-
sive play.
6. Lock spindle in place.
The #2 round jaws have a slight dovetail profile. If
a matching profile is cut into the recess, the jaws
can expand with much greater gripping power.
7. Back chuck off slightly, then quickly rotate
chuck onto spindle. This will firmly seat the
chuck.
#2 Round Jaws
Indexing
The chuck back plate has indents and num-
bers for performing indexing operations. Indexing
allows the circumference of the workpiece to be
divided into equal segments.
An indexing arm (not included) is required to take
advantage of this feature. Research books and
the internet to better understand the process,
what is required, and how to perform indexing
operations.
The #3 round jaws can hold much larger
workpieces than the #2 round jaws and have
ridges that press into the wood for a better grip.
#3 Round Jaws
When mounting workpiece on jaws, do not
contact workpiece with the lower flat of
jaws. This provides better gripping power
and avoids any inconsistencies between
surfaces that would interfere with true rota-
tion.
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#2 Round Jaws:
Pin Jaws
Outside Grip Range ............................. 11⁄8"–13⁄4
Inside Grip Range ................................11⁄2"–21⁄8
"
"
Pin jaws are typically used to expand into a deep
recess cut into a bowl-shaped workpiece for initial
roughing of the outside and tenon (or foot).
#3 Round Jaws:
Outside Grip Range ............................. 21⁄4"–27⁄8
Inside Grip Range ................................27⁄8"–33⁄8
"
"
When used to grip the inside of a recess, the
advantage to pin jaws over step or round jaws is
that they offer a lot of surface area for gripping.
They also have ridges on the outside for greater
gripping power. The disadvantage is that the
recess must be fairly deep. However, this is usu-
ally cut into the waste portion of the workpiece
and removed later.
Round Jaws
(2 jaws removed for clarity)
The smooth center surface of the pin jaws can
also grip externally around a small tenon on
objects such as Christmas ornaments, wooden
tops, lace bobbins, or other delicate work without
marring the workpiece.
Outside
Tenon Grip
Inside
Recess Grip
Outside Grip Range ..................................1⁄4" – 7⁄8
Inside Grip Range ................................15⁄16"–11⁄2
"
"
Pin Jaws
(2 jaws removed for clarity)
Inside
Recess Grip
Small
Diameter
Workpiece
-6-
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Step Jaws
Flat Jaws (or Cole Jaws)
The step jaws have two outside profiles of differ-
ent circumferences designed to expand into the
recess cut into the workpiece. The surfaces of the
jaws have ridges that push into the wood which
increases the gripping power.
Used with included grip studs, flat jaws are pri-
marily used to finish the bottom of a bowl-type
workpiece (see examples below). The included
studs are 13 and 18mm in height and are rubber
coated to prevent marring. Use the stud set and
configuration that has the most surface contact
with the workpiece.
The center surfaces of the step jaws are ridged
and can grip a dowel-type workpiece from the
outside that is fed through the chuck and spindle
bore.
Basically, step jaws combine the capabilities of
the round jaws and the pin jaws, but are much
more versatile than either of those jaws alone.
Upper
Step
Flat Jaws Maximum Outside Diameter ........ 43⁄8
"
Flat Jaws Minimum Inside Diameter ............21⁄16"
Lower
Step
Flat Jaws
Grip
Stud
Outside Grip Range ............................... 3⁄32" – 5⁄8
Inside Grip Range:
"
— Upper Step...................................3⁄4"–11⁄4
— Lower Step................................11⁄2"–21⁄8
"
"
Workpiece
Step Jaws
(2 jaws removed for clarity)
(Top View)
Grip
Inside
Recess Grip
Stud
Outside Grip
(Side View, Outside Grip)
Grip
Stud
(Side View, Inside Grip)
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Woodworm Screw
Bottom Jaw Removal & Installation
The woodworm screw is typically used with the
#2 round jaw set for holding small items. Refer to
the illustration below for closing the round jaws
around the base of the screw.
If it is necessary to remove the bottom jaws for
maintenance or replacement, follow these steps
to ensure the jaws will safely and evenly grip
workpieces.
To remove the bottom jaws:
Woodworm Screw
1. Remove top jaws.
2. Using chuck key, bring bottom jaws together
in center of chuck. This will provide access to
safety set screw.
3. Remove safety set screw under bottom jaw
#4 (see below) and set it aside.
The woodworm screw has a very coarse 45°
thread that provides a positive grip in the wood.
Using the woodworm screw is an easy way to
mount a blank workpiece, but does not provide the
gripping power that the other jaws do. For heavy,
unbalanced workpieces or ones that require more
gripping power, use one of the jaw types or screw
the workpiece to a faceplate.
Safety
Set Screw
When using the woodworm screw, make sure the
workpiece is as round as possible, then drill a 1⁄4
x ⁄8" hole in the waste portion of the workpiece.
Thread the workpiece onto the screw until it is
seated firmly against the chuck.
"
4. Insert chuck key and rotate it counterclock-
wise to move the bottom jaws away from
center of chuck.
7
5. Remove jaws one by one as they disengage
from the scroll gear.
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Model T10808 Wood Lathe Chuck Set
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To re-install the bottom jaws:
Maintenance
Clean and lubricate the chuck on a regular basis
to ensure the jaws move in and out evenly, can
be properly secured to the chuck, and provide a
solid grip.
1. Clean bottom jaws and jaw guides with min-
eral spirits. When dry, apply a thin coat of ISO
32 or equivalent oil to the mating surfaces.
2. Make sure safety set screw is properly
Cleaning
installed in jaw guide #4.
Brush chips and dust off the chuck and jaws. Do
not use pressurized air that can drive the debris
farther into the chuck.
3. Rotate chuck key clockwise until you see
the tip of scroll gear lead thread just begin to
enter jaw guide #1 (see below).
If resin builds up on the sliding surfaces making
the chuck difficult to operate, soak the chuck and
jaws for 30 minutes in mineral spirits with 10%
ISO 32 or equivalent oil added. Drain thoroughly
and allow to dry.
Scroll Gear
Lead Thread
1
1
Locations
May Vary
Lubrication
1. Apply a thin coat of ISO 32 or equivalent oil
to all outside surfaces of bottom and top jaws,
and chuck body.
2. Turn the chuck upside down and remove the
two Phillips head screws that secure back
plate, then remove back plate (see below for
an example).
4. Insert bottom jaw #1 into jaw guide #1, and
hold jaw against scroll gear.
5. Rotate chuck key clockwise one turn to
engage tip of scroll gear lead thread with bot-
tom jaw. Pull the jaw; it should be locked into
jaw guide.
Back
Pinion Gears
Plate
6. Install the remaining jaws in numerical order,
in the same manner. If installed correctly, the
jaws will converge evenly at center of chuck.
—If jaws do not converge evenly, remove
them. Make sure stamped numbers of
bottom jaws and jaw guides match, then
re-install jaws and make sure each one
engages with scroll gear lead thread during
its first rotation.
3. Add several drops of ISO 32 or equivalent oil
to pinion gears, then use chuck key to rotate
scroll gear back and forth to evenly distribute
the lubricant.
4. Replace the back plate before using chuck in
operations.
-9-
Model T10808 Wood Lathe Chuck Set
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Parts
1
20
19
3
22
18
17
16
4
21
2
5
15
6
14
7
8
9
13
10
12
11
REF PART #
DESCRIPTION
REF PART #
DESCRIPTION
1
PT10808001 CAP SCREW M4-.7 X 8
PT10808002 SET SCREW M4-.7 X 6 CONE-PT
PT10808003 ROUND JAW #2 4-PC SET
PT10808004 BOTTOM JAW 4-PC SET
PT10808005 PINION GEAR
12
13
14
15
16
17
18
19
20
21
22
PT10808012 STEP JAW #1 4-PC SET
PT10808013 PIN JAW 4-PC SET
2
3
PT10808014 ROUND JAW #3 4-PC SET
PT10808015 FLAT JAW 4-PC SET
PT10808016 WOODWORM SCREW
4
5
6
PT10808006 CHUCK BODY
PT10808017 GRIP STUD M6-1 X 6, 18L 8-PC SET
PT10808018 HEX WRENCH 4MM
7
PT10808007 THREADED LOCK PIN
PT10808008 SCROLL GEAR
8
PT10808019 T-HANDLE HEX WRENCH 3MM
PT10808020 LATHE CHUCK KEY 8MM CHROME
PT10808021 GRIP STUD M6-1 X 6, 13L 8-PC SET
PT10808022 SPINDLE LEVER 8MM
9
PT10808009 EXT RETAINING RING 34MM
PT10808010 INDEXING BACK PLATE
PT10808011 FLAT HD SCR M3-.5 X 10
10
11
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.
-10-
Model T10808 Wood Lathe Chuck Set
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