Smithy GN1300 - Manual (Page 48)

• Another section that is not as wide and is not keyed to the shaft. It is held in
place on the shaft via a locking nut and can be repositioned as desired.
The narrow section can be offset from the wide section to give the effect of a gear with
thicker teeth. This in turn will give a tighter tooth-to-tooth fit between the feed shaft gear
and the rack on the spindle.
Adjustments are made on the split gear from up inside the mill head casting. This is
accessible from under the mill head between the quill and the support column. Follow the
procedure below to make these adjustments.
Step 1: Look into the millhead casting and locate the items shown in the drawing 5.26.
Step 2: Turn the feed shaft with the coarse feed handwheel until the locking tab of the
locking washer is accessible. Lock the quill in that position with the quill lock lever on the
rear of the millhead.
Step 3: Bend the locking tab straight and use a small punch to loosen the spanner nut
just enough to be able to rotate the adjustable gear with the same punch and small ham-
mer.
Step 4: With the quill still locked in position, have someone turn the coarse feed
handwheel clockwise until it removes any backlash. Then have them hold the handle
in this position until the completion of step 6 . This will move the bottom part of the
wide fixed gear to the left as viewed from below.
Step 5: Using the punch and small hammer, tap the narrow movable gear toward the
right. This will make the gear assembly appear to have thicker teeth.
Step 6: Tighten the spanner nut with the punch and hammer.
Figure 5.26 Adjusting the quill gear to the quill rack
5: Preparing Your Machine For Operation
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Figure 5.27 Adjusting the quill gear to the quill rack