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.
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
Tools Needed | Qty |
Hex Wrench | 4mm |
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 |
|