Grizzly g0749, g0746 owner manual Changing Jaw Set, To change the jaw set

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 39. 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 in numerical order in the jaw guides, so they will hold a concentric workpiece evenly.

	Jaw Guides
Jaw Numbers
	1
2	3

Figure 40. Jaw guide and jaw numbers.

Model G0746/G0749 (Mfg. Since 3/13)

To change the jaw set:

1.disCoNNECt lathE FroM poWEr!

2.place a piece of plywood over the bedways to protect them from potential damage.

3.insert the chuck key and turn it counterclock- wise to back the jaws out and remove them.

4.Use mineral spirits to clean the debris and grime from the jaws and chuck jaw guides.

5.apply a thin coat of white lithium grease to surfaces of removed jaw set. store in a safe place free from moisture and abrasives.

6.rotate chuck key clockwise until you see the tip of the scroll-gear lead thread begin to enter a jaw guide (see figure 38).

1

Lead Thread

Figure 41. Lead thread on scroll gear.

7.insert jaw #1 into the jaw guide and hold the jaw against the scroll-gear.

8.rotate the chuck key clockwise one turn to engage the tip of the scroll-gear lead thread into the jaw. pull the jaw; it should be locked into the jaw guide.

9.install the remaining jaws in numerical order, in the same manner.

—if installed correctly, the jaws will converge evenly at the center of the chuck.

—if the jaws do not converge evenly, remove them. re-install the jaws sequentially 1–3, and make sure each one engages with the scroll-gear lead thread during its first rota- tion.

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