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Copyright © 2020 Quality Machine Tools, LLCPM-1440GT v9 2020-10
GAP BED
A 7-3/4 inch long section of the bed at the headstock end can
be removed to allow turning of diameters up to 20-3/4 in., Fig-
ure 3-28.
To remove the gap insert back out the pusher screws one or
two turns, then remove the four large socket head screws se-
curing the insert to the bed. To minimize cosmetic damage, cut
through the paint and ller along the joint between insert and
bed using a sharp knife or pointed scraper.
Jack out the two taper pins using M5 screws and oversize col-
lars. Tap the insert free with a soft-face mallet.
Before re-installing the insert, be certain that all mating surfac-
es are scrupulously clean. Set the insert in place, lightly tap in
the two locating pins, then install the four large bolts (snug, but
not fully tightened). Jack the insert to the right with the pusher
screws to close the gap, if any, between the ground surfaces of
the bed ways at the join (a visible parting line is acceptable, but
a discontinuity that snags the saddle is not). If a satisfactory
join cannot be achieved, it may be necessary to remove and
reinstall the insert from scratch.
COOLANT SYSTEM
The coolant system is typically used with water-miscible
(emulsied) cutting uid. It can also be used with lightweight
neat cutting oil straight from the can. Synthetic cutting uids
are not recommended due to their potential for corrosion and
other undesirable eects on the lathe and the coolant pump.
If you use water-miscible cutting uid, bear in mind that the
ratio of product to water is important — too much water causes
excessive corrosion and other problems. Check the mix from
time to time using a refractometer. If this is not available, make
up a small batch according to the product directions, then re-
place with a fresh batch when the old one becomes unusable
due to reduced performance, oil/water separation, or bad odor.
Disposal of used cutting uid can be a problem. It is about 95%
water, so its volume can be drastically reduced by evaporation
in an open tank. The residue may then be handled like any
other waste oil.
Figure 3-29 Coolant pump assembly, RH stand cabinet
Figure 3-28 Gap insert
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