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Model G0773 (Mfd. Since 12/14)
-71-
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
Tool Needed: Qty
Hex Wrench 4mm ............................................. 1
The cross slide backlash is adjusted by tightening
and loosening the set screw shown in Figure 121.
Adjusting Leadscrew
End Play
A small amount of end play is normal, however
after a long period of time, you may find that the
leadscrew develops excessive end play. This can
be removed with a simple adjustment of the nuts
at the end of the leadscrew.
Tools Needed Qty
Hex Wrench 6mm .............................................. 1
Open-End Wrench 19mm .................................. 1
To remove leadscrew end play:
1. DISCONNECT MACHINE FROM POWER!
2. Loosen jam nut shown in Figure 122.
3. Using your fingers, tighten retaining nut until
it firmly pushes flat washer against end
bracket, then back retaining nut off
1
⁄8 turn.
4. Hold retaining nut in position and tighten jam
nut against it until snug.
Figure 122. Leadscrew end play adjustments.
Jam Nut
Flat Washer
End Bracket
Leadscrew
Retaining Nut
Move the cross slide handwheel back and forth
while adjusting set screw until backlash is approx-
imately 0.002"–0.003", as indicated on the gradu-
ated dial.
Figure 121. Example of cross slide backlash
adjustment.
Set Screw