Instruction Sheet
Model SB1313
High Precision 6" Lathe Chuck
Four hardened steel jaws
for durability and
extreme clamping
Grease fitting for
complete internal
lubrication
Chucks are heavy! Get assistance when
force and grip
installing or removing the chuck from the
lathe. Wear heavy duty leather boots for
foot and toe protection, and keep hands and
fingers away from all pinch points. Ignoring
this warning can lead to a severe crushing
injury or finger amputation!
Designed for
up to
2000 RPM
Universal
plain-back
mounting
Two-piece
jaws for speedy
internal/external
clamping changes
Specifications
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OD Clamping Range...0.32"-6.30" (8-160mm)
ID Clamping Range ..2.17"-5.90" (55-150mm)
Outer Diameter........................6.57" (167mm)
Maximum Chuck Key Torque .........58 ft/lbs*
Maximum Jaw Gripping Force ....... 4721 lbs*
Maximum Speed .............................2000 RPM
Two-Piece Hardened Steel Jaws ...............Yes
Plain Back Mounting.................................Yes
Jaw Mounting Cap Screw Torque......29 ft/lbs
Grease Fitting Lubricated.........................Yes
Cast-Iron Construction..............................Yes
Chuck Weight......................................... 20 lbs
Origin................................................... Taiwan
Manufactured
with high-tech
German CNC
machinery
Figure 1. Features.
Installation
1. DISCONNECT LATHE FROM POWER!
2. Mount the back plate on the spindle.
3. Accurately measure the inside of the back
relief bore on the chuck. This dimension is
critical and should be 0.001''.
* Maximum handle torque and gripping force
is given at full jaw and scroll gear engage-
ment. If jaw and scroll gear are partially
engaged, clamping force and gripping force is
reduced.
4. Face and true the diameter of the back plate.
Make passes across the face until the entire
surface has been cut.
5. Turn a shoulder into the face 1⁄8'' deep and
0.001" to 0.002'' larger than the back relief
bore diameter. Remember that this is a press
fit. Chamfer the corner a small amount to
prevent any burrs when installing.
If you need help with your new item, contact
us at: (360) 734-1540 • FAX: (360) 676-1075
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Care & Maintenance
3
5
!
7
Always disconnect
machine from power before
performing maintenance or
serious personal injury may
result.
4
6
1
For optimum performance from your chuck,
follow the maintenance schedule below, and
never hammer on the chuck, jaws, or a workpiece
clamped in the chuck. Never subject the chuck to
abrasives, flame, or water.
Note: Each jaw is marked
1, 2, 3, or 4 to correspond
to its marked slot in the
chuck
2
Figure 2. Chuck sequence of disassembly.
Daily:
5. Using mineral spirits, clean and dry all
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Check/correct loose mounting bolts.
Use a vacuum, rag, or brush to clean the
chuck after use. Never use air pressure to
clean chips away from a chuck.
components. Inspect all bores, teeth, pins,
and mating surfaces for wear, burrs, galling,
rust, or cracks.
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Wipe the chuck down with a thin coat of way
oil to prevent surface rust.
Grease the chuck fitting with one to two
pumps of NLGI #2 grease.
6. Without changing the dimension of any part,
use a wire brush, emery cloth, or dressing
stones, to remove any rust, burrs, or high
spots caused by galling.
If the chuck ever becomes stiff to operate, it may
have been contaminated with metal chips or
abrasives from neglect or poor service practices.
The chuck must be dissembled, cleaned, and re-
lubricated.
7. Coat all parts with any automotive NLGI #2
grease, and carefully reassemble the chuck
in the reverse order shown in Figure 2.
8. Rotate the chuck key clockwise until you
see the tip of the scroll-gear lead thread just
begin to enter jaw guide #1.
To disassemble the chuck for a full cleaning
and lubrication service:
9. Insert jaw #1 into jaw guide #1, and hold the
1. DISCONNECT LATHE FROM POWER!
jaw against the scroll-gear.
2. Mark the chuck and the mounting plate
where they mate to ensure that when
reassembled both halves line up. Next,
unbolt the chuck and separate both halves.
10. Rotate the chuck key clockwise one turn to
engage the tip of the scroll-gear lead thread
into the jaw. Pull the jaw; it should be locked
into the jaw guide.
3. Insert and rotate the chuck key
counterclockwise until the scroll-gear has
released all three jaws.
11. Install the other jaws in the same manner,
and install a new grease fitting if the ball or
nipple leak grease.
4. Using a 4mm and 6mm hex wrench, a #1
standard screwdriver, and a ratchet with a
7mm socket, start at #1 and disassemble the
chuck in the sequence shown in Figure 2.
12. Line up the timing mark on the chuck and
the mounting plate, and fasten both halves
by tightening and torquing the fasteners as
outlined in Step 13 in Installation.
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Troubleshooting
If you need replacement parts, or if you are unsure how to do any of the solutions given here, feel free
to call us at (360) 734-1540.
Symptom
Possible Cause
Possible Solution
The chuck has
hard spots or binds
completely.
1. Jaw is in wrong position.
1. Reinstall jaws in correct order and position on scroll
gear.
2. Lack of lubrication, rust, burrs, or
2. Disassemble, de-burr, clean, and lubricate chuck.
metal shavings inside of chuck.
3. Broken tooth on the pinion or the
3. Disassemble, replace broken parts if possible, and
scroll gear.
reassemble chuck.
The workpiece slips
in the jaws.
1. Incorrect jaw or workpiece clamping
1. Reposition jaws and workpiece for maximum scroll
position.
gear and jaw engagement is achieved.
2. Insufficient pinion and scroll gear
2. Tighten chuck key to 65 ft/lbs.
torque.
3. Cutting overload.
3. Reduce cutting depth or feed rate.
4. Chuck is binding before full
4. Disassemble and service/rebuild chuck.
clamping is achieved.
Clamping accuracy
is poor.
1. Workpiece is improperly clamped or
1. Remove jaws, clean, de-burr, and re-install with jaw
jaw is loose or incorrectly seated.
mounting caps crews torqued to 29 ft/lbs.
2. Chuck loose, mounting is off center,
2. Remove chuck, clean and de-burr mounting, and re-
or it is improperly seated.
install, or machine a new mounting plate.
Parts Diagram
Parts List
3
REF PART #
DESCRIPTION
1
2
3
4
5
PSB1313001
PSB1313002
PCAP115M
PSB1313004
PSB1313005
PSB1313006
PSB1313007
PSB1313008
PSB1313009
PCAP172M
GREASE FITTING
TOP JAW
BUTTON HD CAP SCR M6-1 X 16
BACK COVER
LOCK PIN
4
7
8
5
9
6
7
PINION
SCROLL GEAR
6
8
9
11
12
13
14
15
CHUCK KEY W/SPRING
COMPRESSION SPRING
CAP SCREW M8-1.25 X 20 BLK C12.9
HEX WRENCH 8MM
BOTTOM JAW SET OF 4
CHUCK BODY
15
14
PAW08M
1
PSB1313013
PSB1313014
PB174M
11
13
12
HEX BOLT M10-1.5 X 35 BLK C12.9
2
Please Note: We included this breakdown for service purposes only. Since many of the parts shown are machined to each
individual chuck, they are not available as replacement items.
Copyright © March, 2010 By South Bend Lathe Co.
WARNING: No portion of this manual may be reproduced in any shape or form
without the written approval of South Bend Lathe Co.
#CR12664 Printed in Taiwan.
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