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PM-30MV v3 2020-10
Copyright © 2020 Quality Machine Tools, LLC
SERVICING QUILL & SPINDLE
In the normal use the quill assembly needs only oiling on its
outer sliding surface. The spindle runs on pre-lubricated roll-
er bearings and needs little attention, see Spindle Bearings,
above. If the bearings need to be serviced or replaced, re-
move the quill/spindle assembly as follows:
1. Remove any installed R8 device from the spindle.
2. Place a scrap wood block on the table in line with the spin-
dle, then lower the headstock to the point where the spin-
dle nose rests on the block. This will prevent
unexpected
downward movement
of the quill assembly.
3. Lock the lower end of the spindle with the supplied spe-
cial C-wrench, then unscrew the spindle cap (24 mm flats)
from the spindle.
4. Remove the drawbar.
5.
Using a flat-blade screwdriver or other means, press down
on the return spring cup while removing the retaining clip,
Figure 4-5.
Take care to prevent the cup from flying
upward!
6. Remove the return spring.
7. Remove the two button head screws securing the DRO
scale to the quill assembly.
8. Lock the quill, Figure 3-8, then raise the headstock careful-
ly. Slowly release the quill locking lever, while supporting
the quill assembly from below.
There is nothing to stop
the unlocked quill falling out of the headstock!
Figure 4-6
Quill DRO scale and quill assembly
(representative)
For illustration only: for servicing operations the scale should be
detached from the quill and should remain in the DRO
case.
REMOVING THE HEADSTOCK
If you wish to remove the headstock be aware that it is secured
to the base casting by a spring-loaded safety key, Figure 4-7
inset, in addition to the standard three M10 T-bolts and nuts,
Figure 3-12. The safety key locates in a groove in the head-
stock base casting. Remove the entire safety key assembly
before loosening the three T-bolts.
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 excessive heat
build up (the spindle will run warm when used at high
speeds over long periods, but should not be uncomfort
-
ably hot). Overheating can be due to excessive grease,
see above, or an over-tight spindle installation. Call Pre
-
cision Matthews for guidance.
Figure 4-7
Safety groove in headstock base casting