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QUILL RACK & PINION
Lower and lock the quill, Figure 4-2. Using a stiff flux
brush, clean the visible portions of the rack and pinion.
Raise and lower the quill to expose the remainder of the
working surfaces, locking and cleaning at each setting.
Apply grease to the gear teeth.
Figure 4-2 Quill rack
SPINDLE BEARINGS
The spindle runs on sealed, pre-lubricated roller bear-
ings requiring no routine attention.
GIB ADJUSTMENT
Gibs on the X, Y and Z axes control the fit of the mating
dovetailed surfaces. They are gently-tapered lengths of
ground cast iron located by opposing screws at each
end. Adjusting them is a trial and error process that
takes time and patience. Aim for the best compromise
of rigidity and reasonably free table movement. Too tight
means accelerated wear on the ways, leadscrews and
feed motors (X and Z axes only). Too free means work-
piece instability, inaccuracies and chatter.
BOTH screw heads must be tight against the
gib ends. If you loosen one, tighten the other.
Remove the pleated way covers for access to
the back of the Y gib and bottom of the Z gib.
PM-940M 0-206 v.indd
Figure 4-3 Gib screws: Y axis front, X axis right
Figure 4-4 Gib screw: Y axis rear
Figure 4-5 Gib screw: X axis left
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