Grizzly G0740 owner manual Jaw Chuck, Mounting Workpiece

4-Jaw Chuck

refer to the prior Chuck Installation and Chuck Removal sections for instructions on installing or removing the 4-jaw chuck.

the 4-jaw chuck features independently adjust- able hardened steel jaws for holding non-con- centric or off-center workpieces. each jaw can be independently removed from the chuck body and reversed for a wide range of work holding versatility.

because of the dynamic forces involved in machining a non-concentric or off-center workpiece, always use a low spindle speed to reduce risk of the workpiece coming loose and being thrown from the lathe, which could cause death or serious personal injury.

Mounting Workpiece

1.DisConneCt lathe From poWer!

2.place a chuck cradle or plywood on the bed- way below the chuck to protect the bedway surfaces.

3.use the chuck key to open each jaw so the workpiece will lay flat against the chuck face, jaw steps, or into the spindle opening.

4.With help from another person or a holding device, position the workpiece so it is cen- tered in the chuck.

5.tighten each jaw in small increments. after you have adjusted the first jaw, continue tightening the remaining jaws in an opposing sequence, as shown by the sequential order in the figure below.

13

Workpiece

Center Point

42

Figure 38. 4-jaw tightening sequence.

6.after the workpiece is held in place by the jaws, use a dial indicator to make sure the workpiece is centered in the chuck.

—if the workpiece is not correctly centered, make fine adjustments by slightly loosening one jaw and tightening the opposing jaw until the workpiece is correctly positioned (see the figure below for an example).

Figure 39. Generic picture of non-cylindrical workpiece correctly mounted on the 4-jaw chuck.

-36- Model G0740 (Mfg. Since 11/12)