Smithy GN1300 User Manual
Page 47
Step 3: Use a small spanner wrench or a punch with a small mallet to rotate the
bearing supports one at a time. The support bearings are mounted slightly off center in
these housings and rotation of the housings will raise or lower the worm gear down
towards the pinion gear. The bearing support on the right should be rotated clockwise
and the left should be rotated counter clockwise. Rotating the right and left bearing
supports should be done in conjunction with each other.
Step 4: Turn the right housing and watch the worm gear shaft to see in which direction
it moves. Turn the housing in the direction that will move the worm gear down towards
the pinion gear.
Step 5: Move to the left housing and repeat step 4.
Step 6: Alternate moving the front a little and then the rear a little while turning the
worm gear to check for binding.
Step 7: Stop as soon as resistance is felt in the rotation of the worm gear. The
adjustment is completed.
Step 8: Tighten the setscrews to the bearing housings to lock adjustment in place.
Adjusting the fit of the Quill Gear to the Quill
Rack
Adjusting the fit between the quill shaft feed gear and the quill rack is done using the
split section of the feed gear. The feed gear is made up of two parts.
• A wide section that is locked to the feed shaft by a key and has a fixed
position on the shaft
Granite 1300 Series Operator’s Manual
5-17
For Assistance: Call Toll Free 1-800-476-4849
Figure 5.25 Adjusting backlash from the mill feed
Setscrews
Bearing
Housing
Worm Gear & Shaft
(Inside Casting)
Pinion Gear
(Inside Casting)
Dial
Handwheel
Drill Press Handles