Smithy GN1300 - Manual (Page 45)

Step 5: Reinstall the rear support and tighten the locking bolt for the brass nut.
Step 6: Recheck the backlash on the cross-slide.
Adjusting Backlash from the Longitudinal
Leadscrew
Excessive backlash in the longitudinal feed can come from two places.
• The fit of the longitudinal feed screw to the right-hand mounting trestle
• The fit of the half-nut to the feed screw
Engage the half-nut lever. Slowly turn the longitudinal handwheel clockwise as viewed
from the right end of the machine and watch the gap between the dial and the feed screw
mounting trestle. Reverse the direction you are turning the feed screw and see if the gap
increases slightly. If so then there is some backlash in the mounting. Follow the
procedure below to reduce the backlash.
Adjusting the fit of the longitudinal feed screw
to the right-hand mounting trestle
Step 1: Remove the retaining screw and washer in the right end of the longitudinal feed
handwheel.
! NOTICE !
If you find that the four adjusting screws will not stay in place, use
a small amount of thread-locking compound to keep the screws
tight. If you use a Lock-Tite® product, use the Lock-Tite® Purple,
not Red which will not allow for future adjustments
Figure 5.24 Adjusting backlash from the leadscrew
Granite 1300 Series Operator’s Manual
5-15 For Assistance: Call Toll Free 1-800-476-4849
Lead Screw &
Dial
Mounting
Trestle
Spanner
Nut Handwheel
Retaining Screw
& Washer