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PM-236 v4 -207.indd
GIB ADJUSTMENT
Gibs on the cross slide and compound are gently-ta-
pered lengths of ground cast iron held fast by opposing
screws at each end (Figures 4-0 and 4- show only
the screw facing the handwheel). 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 and leadscrews. Too free means instability of
the cutting tool, inaccuracies and chatter.
Both screw heads
must be tight against the gib ends. If
you loosen one, tighten the other.
BALL OILERS
Use a pump-type oil can, preferably with a flexible spout
tipped with a soft tube. The ID of the tip should be large
enough to seat on the oiler's brass flange, more than
spanning the spring-loaded steel ball. When the oil can
tip is firmly pressed onto the brass surface oil pressure
will displace the ball, allowing oil to flow into the bearing.
Before oiling check that the ball is not stuck – press it
lightly with a probe.
Figure 4-7
Carriage, cross slide and compound oilers
Figure 4-8
Leadscrew and feed shaft oilers
Figure 4-0
Cross slide front gib screw
Figure 4-
Compound front gib screw
The carriage gib, Figure 4-2, is not a tapered insert like
those on the cross slide and compound. It is a three-part
assembly on the underside of the bed way at the back
Figure 4-9
Tailstock oilers
