South Bend Tools
For Machines Mfd. Since 12/21
Model SB1007
-31-
O P E R A T I O N
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
Figure 31. Jaw selection and workpiece holding.
. Jaw selection and workpiece holding.
Insufficient
Jaw Clamping
Unstable
Workpiece
Bar Stock
Inside
Safer
Use
Jaw
Cylinder
Unsafe Jaw Position
Poor Scroll
Gear Engagement
Inside
Safer
Use
Jaw
Shallow
Bar Stock
Inside
Unsafe
Use
Jaw
Poor Scroll Gear Engagement
Unsafe Jaw Position and
Outside
Safer
Use
Jaw
Poor Scroll Gear Engagement
Unsafe Jaw Position and
Poor
Unstable
Workpiece
Shallow
Bar Stock
Outside
Safer
Use
Jaw
Grip
Figure
Figure 30. Camlock is fully loosened when cam line is
. Camlock is fully loosened when cam line is
aligned with spindle mark.
aligned with spindle mark.
Cam line aligned with spindle mark
Chuck Removal
To remove chuck:
1.
DISCONNECT LATHE FROM POWER!
2.
Use an appropriate lifting, support, or
protective device to protect ways and support
chuck (refer to Installation & Removal
Devices on Page 29).
3.
Loosen camlocks by turning key
counterclockwise until each of the cam lines
is aligned with its corresponding spindle
mark (see Figure 30).
Note:
Camlocks can become very tight. A
cheater pipe may be used as a last resort
to add leverage when loosening. After
loosening, you may need to wiggle the chuck
key in the camlock to fully disengage the
stud.
4.
Using a dead blow hammer or other
soft mallet, lightly tap around outer
circumference of chuck body to loosen it from
spindle.
5.
Remove chuck from spindle using a light
rocking motion to carefully slide studs out of
cam holes.
— If chuck does not immediately come off,
rotate it approximately 60° and tap it
again. Make sure all marks on cams
and spindle are in proper alignment for
removal.
