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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
micrometer-collar graduated 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 6mm .............................................. 1
hex Wrench 5mm .............................................. 1
punch pin 2mm ................................................ 1
cross Slide backlash
1.
Feed the cross slide toward the front of the
machine until it reaches the end of its travel.
2.
remove the cap screw that secures the cross
slide leadscrew nut (see figure 119).
figure 119. Location of cap screw that secures
the leadscrew nut.
3.
rotate the cross slide handle clockwise to
feed the leadscrew nut out from under the
cross slide, as shown in figure 120.
Model G0750G (Mfg. Since 11/12)
Qty
Cap screw securing
Leadscrew nut to
Cross slide
Leadscrew nut
figure 120. Leadscrew nut.
4.
tighten the backlash adjustment cap screw
shown in figure 120 in small increments.
5.
hold the leadscrew nut and test after each
adjustment by rotating the handwheel back-
and-forth until the backlash amount is accept-
able.
6.
Feed the leadscrew nut back under the cross
slide and replace the cap screw removed in
Step 2.
compound Slide backlash
1.
turn the compound slide handwheel counter-
clockwise several turns.
2.
Loosen the set screws on the compound slide
faceplate several turns (see figure 121).
set
screws
figure 121. Compound slide backlash
adjustments.
3.
use a punch pin to loosen the faceplate and
turn it until the backlash is approximately
0.002"–0.003", as indicated on the graduated
dial.
4.
secure the setting with the set screws.
5.
repeat the adjustments above if necessary.
Backlash
Adjustment
Cap screw
-71-
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