Smithy GN1300 - Manual (Page 43)

Adjusting Backlash
Backlash is lost motion in the screw. The user will notice an initial small movement in the
handwheel before the screw responds. The procedures in this section will help minimize
backlash.
Adjusting Backlash from the Cross-Slide Screw
Before making any adjustments to the cross-feed screw system, all the gibs on the table
and carriage system should be checked and adjusted as described previously.
Excessive backlash in the cross-slide can come from three different places.
• The fit of the cross-slide screw to the front screw mount
• The fit of the cross-slide screw into the brass crossfeed nut
• The fit of the brass cross-feed nut into the carriage casting
There are adjustments for each of these areas. Follow the procedures below to make
each adjustment.
Adjusting Backlash Cross-Slide Screw to the Front
Screw Mount
Step 1: Loosen the two nuts that hold the cross-slide handwheel on to the end of the
cross-slide screw.
Step 2: Tighten the inner nut slowly while checking the ease of movement of the
cross-slide handwheel. When the screw starts to become difficult to turn, loosen the nut
slightly so that the screw turns freely.
Step 3: Hold the inner nut in place with a wrench and tighten the outer nut against the
inner nut to lock both nuts in position.
Step 4: Recheck the backlash.
Figure 5.21 Loosen the two outer nuts holding the handwheel
Granite 1300 Series Operator’s Manual
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