Grizzly G9249 owner manual Using the 4-Jaw Chuck, To mount a workpiece on the 4-jaw chuck

5.Rotate the chuck key clockwise until you see the tip of the scroll-gear lead thread just begin to enter the jaw guide, as shown in

Figure 27.

Scroll-Gear

Lead Thread

Figure 27. Installing jaw into the 3-jaw chuck.

6.Position the jaw with the beveled edge point- ing to the center of the chuck, then insert the jaw into the jaw guide and hold it against the scroll-gear lead thread.

7.While firmly holding the jaw in place, rotate the chuck key clockwise one turn to engage the jaw with the scroll-gear threads.

Note: Pull on the jaw to make sure it is engaged with the scroll-gear.

8.Repeat Steps 6–7with the remaining jaws.

—If installed correctly, the three jaws will con- verge together at the center of the chuck.

—If the jaws do not come together, repeat this procedure until they do.

Using the 4-Jaw Chuck

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

Tools Needed	Qty
Chuck Key	1

G9249  12" x 37" Belt Drive Gap Bed Lathe

To mount a workpiece on the 4-jaw chuck:

1.DISCONNECT LATHE FROM POWER!

2.Use a piece of wood to protect the bedways.

3.Use the chuck key to open each jaw until the workpiece can lie flat against the chuck face.

4.With assistance to hold the workpiece in place, tighten each jaw in small increments. After adjusting the first jaw, continue tight- ening in opposing sequence, as shown in Figure 28, until the workpiece is firmly secure in the desired position.

&(

m

)'

Figure 28. 4-jaw tightening sequence.

5.Make fine adjustments by using a test indica- tor and adjusting the jaws until the workpiece is precisely aligned (see Figure 29).

Figure 29. Example of using a test indicator to

align a workpiece in a 4-jaw chuck.

-25-