South bend SB1231 Instruction Sheet

12" 4-JAW INDEPENDENT CHUCK
Chucks are heavy! Get assistance when
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!

Specifications

• OD Clamping ...... 0.69"–10.04" (17.5–255mm)
• ID Clamping .......... 3.74"–10.83" (95–275mm)
• Chuck Bore Diameter ................2.56" (65mm)
• Chuck Outer Diameter ..........11.81" (300mm)
• Maximum Speed ...........................2500 RPM*
• Mounting Type ......................... D1-8 Camlock
• Construction ..................Fine-Grain Cast-Iron
• Chuck Weight ......................................... 80 lbs
• Chuck Shipping Weight ......................... 85 lbs
• Country of Origin ................................ Taiwan
* The maximum speed listed above is ONLY
possible with the chuck jaws and the
workpiece in complete rotational symmetry.
The workpiece weight must be within the
limits of the lathe, and the workpiece mass
must be of equal density throughout to
prevent centrifugal imbalance or radial
runout—even if a tailstock or other support
is used for additional support.
WARNING: No portion of this manual may be reproduced without written approval.
MODEL SB1231
Instruction Sheet
PHONE: (360) 734-1540 •
Copyright © October, 2010 by South Bend Lathe Co.
#CR13310 Printed in Taiwan
www.southbendlathe.com
Hardened steel jaws
for durability and
extreme clamping
force and grip
Direct
camlock
spindle
mounting
Jaw screw
retaining pin
with lock screws
Figure 1. Features.
Introduction
The Model SB1231 uses a direct mount D1-8
camlock system where the camlock studs are
directly threaded into to the chuck body instead
of being threaded into a backing plate that
is bolted to the chuck. Without using a back
plate to mount the chuck, the chuck jaws are
positioned closer to the headstock which gives
a longer distance between the jaws and the
tailstock. Another benefit is that the distance
between the jaws and the outboard spindle nose
is reduced, so if a spider support is used on the
outboard spindle, short gun barrels and other
shorter workpieces can be held at both ends.
Independent jaw
screws for each
reversible jaw
Manufactured
with high-tech
German CNC
machinery
Fine-grain cast
iron body