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Scroll Chuck Clamping
This scroll-type chuck has an internal scroll-gear
that moves all jaws in unison when adjusted with
the chuck key. This chuck will hold cylindrical
parts on-center with the axis of spindle rotation
and can be rotated at high speeds if the
workpiece is properly clamped and balanced.
Never mix jaw types or positions to
accommodate an odd-shaped workpiece.
The chuck will spin out of balance and
may throw the workpiece! Instead, use an
independent jaw chuck or a faceplate.
Figure 9. Jaw selection and workpiece holding.
Insufficient
Jaw Clamping
Unstable
Workpiece
Bar Stock
Inside
Safer
UseJaw
Cylinder
Unsafe Jaw Position
Poor Scroll
Gear Engagement
Inside
Safer
UseJaw
Shallow
Bar Stock
InsideUnsafe
UseJaw
Poor Scroll Gear Engagement
Unsafe Jaw Position and
Outside
Safer
UseJaw
Poor Scroll Gear Engagement
Unsafe Jaw Position and
Poor
Unstable
Workpiece
Shallow
Bar Stock
Outside
Safer
UseJaw
Grip
This chuck has 2-piece jaws that consist of a
top jaw and a master jaw. The top jaw can be
removed, rotated 180°, and re-installed in the
reverse position for additional work-holding
options. When reversing the top jaws, always
keep them matched with their original master
jaw to ensure the best fit.
To reverse 2-piece jaws:
1. DISCONNECT MACHINE FROM POWER!
2. Remove the cap screws that secure the top
jaw to the master (bottom) jaw.
3. Remove the top jaw, rotate it 180°, then re-
install it with the longest cap screw in the
tallest portion of the jaw.
4. Repeat Steps 2–3 with each remaining jaw
(we recommend only reversing one jaw at a
time to keep all original parts together).
Figure 10. Reversing the chuck jaws.
Master Jaw
Rotate Top
Jaw 180º
Long Cap ScrewShort Cap Screw
Chuck Jaw Reversal
Remove all tools before
turning lathe ON. Thrown
tools can cause serious
injury or death to operator
or bystanders.
-6-
Mfg. Since 1/11
Model SB1224
INSTRUCTIONS