Southbend Lathe SB1307 User Manual

Instruction Sheet  
Model SB1307  
High Precision 6" Lathe Chuck  
Grease fitting for  
complete internal  
lubrication.  
Hardened steel jaws  
for durability and  
extreme clamping  
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......................................... 19 lbs  
Origin................................................... Taiwan  
Manufactured  
with high-tech  
German CNC  
machinery.  
Figure 1. Features.  
Installation  
1. UNPLUG THE MACHINE 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 the back plate to true it. Make passes  
across the face until its 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
6
5
!
Always disconnect  
machine from power before  
performing maintenance or  
serious personal injury may  
result.  
4
7
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, or 3 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.  
Keep the chuck clean and oiled.  
components. Inspect all bores, teeth, pins,  
and mating surfaces for wear, burrs, galling,  
rust, or cracks.  
Use a vacuum, rag, or brush to clean the  
chuck after use. Never use air pressure to  
clean chips away from a chuck.  
6. Without changing the dimension of any part,  
use a wire brush, emery cloth, or dressing  
stones, to remove all rust, burrs, and any  
high spots caused by galling.  
Avoid leaving the chuck clamped on a  
workpiece, unload the chuck jaws daily.  
Make sure the chuck key is removed from  
the chuck when not using the key.  
7. Coat all parts with any automotive NLGI #2  
grease, and carefully reassemble the chuck  
in the reverse order shown in Figure 2.  
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.  
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  
jaw against the scroll-gear.  
1. UNPLUG THE MACHINE FROM POWER!  
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.  
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.  
11. Install the other jaws in the same manner,  
3. Insert and rotate the chuck key  
counterclockwise until the scroll-gear has  
released all three jaws.  
and install a new grease fitting.  
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 9 in Chuck Installation.  
4. Using a basic set of metric hex wrenches  
and a #1 standard screwdriver, start at #1  
and disassemble the chuck in the sequence  
shown in Figure 2.  
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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, burr, or  
2. Disassemble, de-burr, clean, and lubricate chuck.  
metal shavings inside of chuck.  
3. Broken tooth on the pinion or the  
3. Disassemble and rebuild chuck.  
scroll gear.  
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 58 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 improperly clamped or  
1. Remove jaws, clean, de-burr, and reinstall 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  
or it is improperly seated.  
reinstall, or machine a new mounting plate.  
Parts Diagram  
Parts List  
REF PART #  
DESCRIPTION  
GREASE FITTING  
TOP JAW  
BUTTON HD CAP SCR M6-1 X 16  
BACK COVER  
LOCK PIN  
PINION  
SCROLL GEAR  
CHUCK KEY W/SPRING  
COMPRESSION SPRING  
CAP SCREW M10-1.5 X 70 BLK C12.9  
CAP SCREW M8-1.25 X 20 BLK C12.9  
HEX WRENCH 8MM  
BOTTOM JAW SET OF 3  
CHUCK BODY  
3
1
PSB1307001  
4
2
3
PSB1307002  
PCAP115M  
7
4
5
PSB1307004  
PSB1307005  
PSB1307006  
PSB1307007  
PSB1307008  
PSB1307009  
PSB1307010  
PSB1307011  
PAW08M  
8
5
6
9
6
7
8
9
10  
11  
12  
13  
14  
15  
10  
15  
13  
14  
1
PSB1307013  
PSB1307014  
PSB1307015  
11  
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 © January, 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.  
#CR12483 Printed in Taiwan.  
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