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Figure 4-9 Quill return spring housing
TABLE POWER FEED
There are two carbon brushes on the power feed mo-
tor. If removed for inspection, they should be replaced
in the same orientation. Replace both when worn down
to about 0.2".
SPINDLE BEARINGS
The spindle runs on grease-lubricated tapered roller
bearings. These should be serviced every 500 hours of
running time. Thoroughly clean each bearing assembly
then repack with a grease such as Kluber Isoflex (auto
shop wheel bearing grease can be used as a substitute
in low-load, low rpm operations).
Do not over-pack the roller bearings!
Bearing manufacturers recommend that the free volume
between inner and outer should be no more than 30%
filled with grease. (If smothered with grease, bearings
are subject to overheating.)
Especially during the first 10 hours of running time
check that the spindle runs smoothly, without ex-
cessive heat build up (the spindle will run warm
when used at high speeds over long periods, but
should not be uncomfortably hot). Overheating can
be due to excessive grease, see above, or an over-
tight spanner nut at the upper end of the spindle.
Call Precision Matthews for guidance.
PM-940M 0-206 v.indd
COLLET LOCATING SCREW
R8 collets are located in the spindle by a set screw
through the inner wall of the quill. A second set screw,
visible in Figure 4-0, locks in the inner screw in place. If
collets bind in the spindle when inserted, the inner screw
may be in too far.
For access to the screws, remove the threaded flange
from the bottom end of the quill, Figure 4-. Unscrew
the flange using a pin wrench, or tap it around with a
hammer and soft metal drift.
Figure 4- Quill flange partly unscrewed
25
Figure 4-0 Collet locating screw
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