Adjusting Backlash - Grizzly G0791 Owner's Manual

Adjusting Backlash

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 2.5mm ........................................... 1
Hex Wrench 5mm .............................................. 1
Hex Wrench 6mm .............................................. 1
Punch Pin 2mm ................................................ 1
Cross Slide Backlash
1. DISCONNECT MACHINE FROM POWER!
2.
Feed cross slide toward operator until it
reaches end of its travel.
3.
Remove cap screw that secures cross slide
leadscrew nut (see Figure 141).
Note: You may need to rotate compound rest
(see Page 47) to expose cap screw.
Figure 141. Location of cap screw that secures
the leadscrew nut.
-86-
Qty
Cap Screw Securing
Leadscrew Nut to
Cross Slide
4. Rotate cross slide handwheel clockwise to
feed leadscrew nut out from under cross
slide, as shown in Figure 142.
Leadscrew Nut
Figure 142. Cross slide leadscrew nut.
5.
Tighten backlash adjustment cap screw
shown in Figure 142 in small increments.
6.
Hold leadscrew nut and test after each
adjustment by rotating handwheel back-and-
forth until backlash amount is approximately
0.002"–0.004".
7. 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 143).
Set
Screws
Figure 143. Compound rest backlash
adjustments.
Model G0791 (Mfd. Since 9/15)
Backlash
Adjustment
Cap Screw
Faceplate