Southbend Lathe SB1313 User Manual

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  
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 18'' 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  
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.  
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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