Grizzly MODEL G0765 owner manual Scroll Chuck Clamping, Changing Jaw Set

Scroll Chuck

Clamping

This 3-jaw scroll-type chuck has an internal scroll- gear that moves all jaws in unison when adjusted with the chuck key. This chuck holds 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		Unstable
				Workpiece
	Bar Stock
CORRECT			INCORRECT
	Unsafe Jaw Position and
Safer Outside	Poor Scroll Gear Engagement
				Poor Grip
Jaw Use
	Shallow			Unstable
	Bar Stock
				Workpiece
CORRECT			INCORRECT
Safer Outside		Unsafe Inside
			Jaw Use
Jaw Use			Poor Scroll
	Shallow		Gear
	Bar Stock		Engagement
	Unsafe Jaw
CORRECT	Position		INCORRECT
Safer Inside		Unsafe Jaw Position
Jaw Use
	Cylinder
CORRECT	Poor Scroll		INCORRECT
	Gear Engagement

Figure 22. Jaw selection and workpiece holding.

Model G0765 (Mfd. Since 12/13)

Changing Jaw Set

The 3-jaw scroll chuck included with the lathe features inside and outside hardened steel jaw sets (see Figure below), which move in unison to center a concentric workpiece.

When installing the jaws, it is important to make sure they are installed correctly. Incorrect installa- tion will result in jaws that do not converge evenly and are unable to securely clamp a workpiece.

Outside Set Inside Set

Figure 23. Chuck and jaw selection.

Jaws are numbered from 1–3 (see Figure below). The number is typically stamped on the side or bottom. Jaws are designed to be installed coun- terclockwise in numerical order in the jaw guides, so they will hold a concentric workpiece evenly.

	Jaw Guides
Jaw Numbers
	1
2	3

Figure 24. Jaw guide and jaw numbers.

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