-76-
Model G0740 (Mfg. Since 11/12)
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.
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 3mm .............................................. 1
The compound rest backlash is adjusted by tight-
ening the set screws shown in Figure 113. When
these screws are adjusted against the leadscrew
nut, they offset part of the nut to remove play
between the nut and leadscrew.
To adjust the backlash, rock the handwheel back
and forth, and tighten the screws slowly until the
backlash is approximately 0.002"–0.003", as indi-
cated on the graduated dial.
If you end up adjusting the nut too tight, loosen
the set screws, 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 113. Compound rest backlash adjustment
set screws.
Set
Screws
Cross Slide
Tools Needed: Qty
Hex Wrench 3mm .............................................. 1
Hex Wrench 5mm ............................................. 1
The cross slide backlash is adjusted by loosen-
ing all four cap screws shown in Figure 114,
then tightening the center set screw. This will
push down on a wedge and force the leadscrew
nut apart, taking up lash between the nut and
leadscrew.
To adjust the backlash, remove the compound
rest and loosen the four cap screws. Then, rock
the cross slide handwheel back and forth, and
tighten the set 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 set screw, tap the cross slide a few times
with a rubber or wooden mallet, and turn the
handwheel slowly back and forth, until the handle
turns freely—then try again.
Remember to re-tighten the four cap screws when
you are finished.
Figure 114. Cross slide backlash adjustment
screws.
Cap Screws
Set Screw
