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Adjusting Backlash
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 nut and leadscrew.
Reducing backlash to less than 0.002" is
impractical and can lead to accelerated
wear in leadscrew and other components.
Avoid temptation to overtighten leadscrew
nut or set screw while adjusting.
Cross Slide
Tools Needed:
Hex Wrench 3mm ............................................. 1
The cross slide backlash is adjusted by tighten-
ing and loosening the set screw shown in Figure
139. The set screw adjusts the height of the
leadscrew nut, taking up lash between the nut and
leadscrew.
Figure 143. Cross slide backlash adjustment.
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.
-82-
Qty
Set Screw
Adjusting Leadscrew
End Play
After a long period of time, you may find that the
leadscrew develops excessive end play. This
lathe is designed so that end play can be removed
with a simple adjustment.
Tools Needed
Hex Wrench 4mm .............................................. 1
Open-End Wrench 14mm .................................. 1
To remove leadscrew end play:
1.
DISCONNECT MACHINE FROM POWER!
2.
Loosen set screw shown in Figure 144 sev-
eral turns.
Leadscrew
End Bracket
Figure 144. Leadscrew end play adjustments.
3.
Tighten retaining nut with your fingers so it
just contacts end bracket, then back nut off
⁄
turn.
1
8
4.
Hold nut in position and tighten set screw
against leadscrew until snug.
Model G0768/G0769 (Mfd. Since 8/15)
Qty
Retaining Nut
Set Screw
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