South bend SB1213 User Manual
MODEL SB1213
10" 4-JAW INDEPENDENT CHUCK
Instruction Sheet
PHONE: (360) 734-1540 • www.southbendlathe.com
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 ........... 0.59"–8.46" (15–215mm)
• ID Clamping ............ 2.95"–9.45" (75–240mm)
• Chuck Bore Diameter ................2.16" (55mm)
• Chuck Outer Diameter ............9.84" (250mm)
• Chuck Mounting Cap Screw Torque ..60 ft/lbs
• Maximum Speed ...........................2750 RPM*
• Mounting Type ............. Universal Plain Back
• Construction ..................Fine-Grain Cast-Iron
• ChuckWeight ......................................... 50 lbs
• ChuckShippingWeight ......................... 52 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.
Hardened steel jaws
for durability and
extreme clamping
force and grip
Universal plainback mounting
Independent jaw
screws for each
reversible jaw
Front access for
mounting cap
screws
Fine-grain cast
iron body
Manufactured
with high-tech
German CNC
machinery
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''.
4. Face the entire surface of the back plate.
5. Turn a shoulder into the back plate face that
1
⁄8'' deep and 0.001" to 0.002'' larger than
is
the relief bore that is on the mounting side of
the chuck. (Remember, a press fit must exist
between the two.) Slightly chamfer the edges
to prevent any burrs when installing.
Copyright © October, 2010 by South Bend Lathe Co.
WARNING: No portion of this manual may be reproduced without written approval.
#CR13303 Printed in Taiwan
Model SB1213
INSTRUCTIONS
Mfg. Since 5/10
6. Set the chuck on the back plate, and align
the shoulder with the relief bore. Use a
transfer punch to mark the mounting holes
in the back plate. Or you can use a drill bit
of the same diameter as the mounting holes
in the chuck. Lightly tap on the bit, rotate it
90°, and tap it again to form an X.
7. Remove the back plate from the lathe, drill
the chuck mounting cap screw holes though
the back plate, and then tap the holes.
8. Clean and stone all mating surfaces until
they are perfectly clean and free of burrs.
9. Place the back plate into a freezer for 30
minutes; place the chuck in an oven at 100°F
for the same amount of time.
10. Put on insulated leather gloves and fasten
the chuck to the back plate with the
mounting cap screws only finger tight, then
install the assembly onto the lathe spindle.
11. Tighten the chuck mounting cap screws in
a star pattern in three progressively tighter
sequences until the required torque value is
reached. Alternating the tightening process
insures the chuck will be pressed on straight.
Repeat this step until the chuck seats with
back plate. If the chuck is loose, or is crooked
on the shoulder, it will be necessary to recut
the back plate face and shoulder again.
Secure Clamping: A thrown workpiece
•
may cause severe injury or even death.
When swapping the chuck jaw positions,
keep in mind that maximum gripping
force is attained at full jaw and jaw screw
engagement. If only one is partially engaged,
overall clamping force is reduced.
Speed Rates: Operating the lathe where
•
maximum chuck speed is exceeded, or at too
high of a speed for an unbalanced workpiece,
can cause the workpiece to be thrown from
the chuck. Always use the appropriate feed
and speed rates. A thrown workpiece may
cause severe injury or even death.
Large Chucks: Large chucks are very
•
heavy and difficult to grasp, which can lead
to crushed fingers or hands if mishandled.
Get assistance when installing or removing
large chucks to reduce this risk. Protect your
hands and the precision ground ways by
using a chuck cradle or piece of plywood over
the ways of the lathe when servicing chucks.
Safe Clearances: Often chuck jaws will
•
protrude past the diameter of the chuck and
can contact a coolant nozzle, tooling, tool
post, or saddle. Before starting the spindle,
make sure the workpiece and the chuck
jaws have adequate clearance by rotating it
through its entire range of motion by hand.
12. When installation is complete, lightly stamp
alignment marks in the chuck and back plate
to ensure that the chuck will be re-installed
in the same position if ever removed.
Safety
• Chuck Key Safety: A chuck key left in the
chuck can become a dangerous projectile
when the spindle is started. Always remove
the chuck key after using it. Develop a habit
of not taking your hand off of a chuck key
unless it is away from the machine.
Disconnect Power: Disconnect the lathe
•
from power before installing and removing
the chuck or doing any maintenance or
adjustments. Accidental lathe startup can
cause severe injury or death.
-2-
Stopping Lathe By Hand: Stopping
•
the spindle by putting your hand on the
workpiece or chuck creates an extreme risk
of entanglement, impact, crushing, friction,
or cutting hazards. Never attempt to slow
or stop the lathe chuck by using your hand.
Allow the spindle to come to a stop on its
own or use the brake (if equipped).
Long Stock Safety: Long stock can whip
•
violently if not properly supported, causing
serious impact injury and damage to the
lathe. Reduce this risk by supporting any
stock that extends from the chuck/headstock
more than three times its own diameter.
Always turn long stock at slow speeds.
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