Backlash Adjustment

Backlash is the amount of free play felt while changing rotation directions with the handwheel. This can be adjusted on the cross slide leadscrew. Before beginning any adjustment, make sure all associated components are cleaned and lubri- cated and locks are loose.

When adjusting backlash, tighten the components enough to remove backlash, but not so much that the components bind the leadscrew, making it hard to turn. Overtightening will cause excessive wear to the sliding block and leadscrew.

Reducing backlash to less than 0.002" is impractical and can lead to accelerated wear in the leadscrew and other components. Avoid the temptation to overtighten the backlash nut or screw while adjusting.

Cross Slide

 

Tools Needed:

Qty

Hex Wrench 2.5mm.

.......................................... 1

Hex Wrench 3mm

1

The cross slide backlash is adjusted by tighten- ing and loosening the inner and outer cap screws shown in Figure 80. The inner screw adjusts the height of the leadscrew nut, taking up lash between the nut and leadscrew.

Inner Cap

Screw

Outer Cap

Screws

Figure 80. Cross slide backlash adjustment cap

screw.

-56-

Angle the compound rest so you can access the cap screws shown in Figure 80. Loosen the outer cap screws, adjust the inner cap screw, then tighten the outer cap screws. Move the cross slide handwheel back and forth and adjust backlash until it is approximately 0.002"–0.003", as indicated on the graduated dial. Re-adjust the compound rest angle when you are finished.

Leadscrew End-Play

Adjustment

After a long period of time, you may find that the leadscrew develops excessive end-play or lateral movement. This lathe is designed so that end- play can be removed with a simple adjustment.

Tools Needed

Qty

Hex Wrench

4mm

Open-End Wrench 12mm

1

To remove leadscrew end play:

1.DISCONNECT LATHE FROM POWER.

2.Loosen set screw shown in Figure 81 sev- eral turns.

Leadscrew

Retaining Nut

 

 

Set Screw

End Bracket

 

Figure 81. Leadscrew end-play adjustments.

3.Tighten retaining nut with your fingers so it just contacts end bracket, then back nut off 18 turn.

4.Hold nut in position and tighten set screw against leadscrew until snug.

Model G0765 (Mfd. Since 12/13)

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Grizzly MODEL G0765 Backlash Adjustment, Leadscrew End-Play Adjustment, Cross Slide, To remove leadscrew end play