-78-
Model G0746/G0749 (Mfg. Since 3/13)
backlash Adjustment
Backlash is the amount of free play felt while
changing rotation directions with the handwheel.
this can be adjusted on the compound rest and
cross slide leadscrews. Before beginning any
adjustment, make sure all associated components
are cleaned and lubricated 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
of the wedge, nut, and leadscrew. Avoid the
temptation to overtighten the backlash set
screw while adjusting.
compound Rest
Tools Needed:
Qty
hex Wrench 5mm .............................................. 1
the compound rest backlash is adjusted by
tightening the cap screw shown in
figure 126.
When the cap screw is tightened, the leadscrew
nut draws down on the leadscrew, removing play
between these components.
to adjust the backlash, rock the handwheel back
and forth, and tighten the cap screw slowly until
the backlash is approximately 0.002"–0.003", as
indicated on the graduated dial.
if you end up adjusting the nut too tight, loosen
the cap screw, tap the compound rest a few times
with a rubber or wooden mallet, and turn the
handwheel slowly back and forth until it moves
freely—then try again.
figure 126. Compound rest backlash adjustment
cap screw.
Cap
screw
cross Slide
Tools Needed:
Qty
hex Wrench 6mm ............................................. 1
the cross slide backlash is adjusted by loosening
the cap screw shown in
figure 127. this will push
the leadscrew nut against the leadscrew, taking
up lash between these components.
figure 127. Cross slide backlash adjustment
screw.
Cap screw
adjust the backlash in a similar manner to that for
the compound rest.
