Backlash Adjustment - Grizzly G4003G 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 Wrench 2mm .............................................. 1
Hex Wrench 5mm .............................................. 1
Hex Wrench 6mm .............................................. 1
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 108).
Cap Screw Securing
Leadscrew Nut to
Cross Slide
Figure 108. Location of cap screw that secures
the leadscrew nut.
-70-
3. Rotate cross slide handwheel clockwise to
feed leadscrew nut out from under cross
slide, as shown in Figure 109.
Leadscrew Nut
Qty
Figure 109. Cross slide leadscrew nut.
4.
Tighten backlash adjustment cap screw
shown in Figure 109 in small increments.
5.
Hold leadscrew nut and test after each
adjustment by rotating handwheel back-and-
forth until backlash amount is approximately
0.002"–0.004".
6. Feed leadscrew nut back under cross slide
and replace cap screw removed in Step 2.
Compound Rest Backlash
1.
Turn compound rest handwheel counter-
clockwise several turns.
2.
Loosen set screws on compound rest face-
plate several turns (see Figure 110).
Figure 110. Compound rest backlash
Backlash
Adjustment
Cap Screw
Faceplate
Set
Screws
adjustments.
Model G4003G (Mfd. Since 1/15)