Backlash Adjustment - Grizzly G0949G Owner's Manual

Backlash Adjustment

Backlash is the amount of play in a leadscrew and
can be felt as the free play in a handwheel when
changing direction of rotation. The amount of the
backlash can be viewed on the handwheel gradu-
ated dial.
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.
Tools Needed
Hex Wrenches 2, 5, 6mm ............................1 Ea.
Punch Pin 2mm ................................................ 1
Cross Slide Backlash
1. Feed cross slide toward operator until it
reaches end of its travel.
2. Remove cap screw that secures cross slide
leadscrew nut (see Figure 101).
Figure 101. Location of cap screw that secures
leadscrew nut.
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.
-68-
3.
4.
Qty
5.
6.
Compound Rest Backlash
Cap Screw
1.
2.
Rotate cross slide handwheel clockwise to
feed leadscrew nut out from under cross
slide, as shown in Figure 102.
Tighten backlash adjustment cap screw
shown in Figure 102 in small increments.
Leadscrew Nut
Figure 102. Cross slide leadscrew nut.
Hold leadscrew nut and test after each
adjustment by rotating handwheel back-and-
forth until backlash amount is approximately
0.002"–0.004".
Feed leadscrew nut back under cross slide
and replace cap screw removed in Step 2.
Turn compound rest handwheel counter-
clockwise several turns.
Loosen set screws on compound rest face-
plate several turns (see Figure 103).
Set
Screws
Faceplate
Figure 103. Compound rest backlash
adjustments.
Model G0949G (Mfd. Since 01/22)
Backlash
Adjustment
Cap Screw