Southbend SB1224 Scroll Chuck Clamping, Chuck Jaw Reversal, To reverse 2-piece jaws

Model SB1224 I N S T R U C T I O N S Mfg. Since 1/11

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.

Safer Inside	Insufficient
Jaw Use	Jaw Clamping
Bar Stock
	Unstable
	Workpiece
Safer Outside	Unsafe Jaw Position and
	Poor Scroll Gear Engagement
Jaw Use	Poor
Shallow	Grip
Bar Stock	Unstable
	Workpiece
Safer Outside	Unsafe Inside
	Jaw Use
Jaw Use
Shallow
Bar Stock
Unsafe Jaw Position and
Poor Scroll Gear Engagement
Safer Inside	Unsafe Jaw Position
Jaw Use
Cylinder
Poor Scroll
Gear Engagement

Figure 9. Jaw selection and workpiece holding.

Chuck Jaw Reversal

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 2–3with each remaining jaw (we recommend only reversing one jaw at a time to keep all original parts together).

Short Cap Screw Long Cap Screw

Rotate Top

Jaw 180º

Figure 10. Reversing the chuck jaws.

Remove all tools before turning lathe ON. Thrown tools can cause serious injury or death to operator or bystanders.

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