10
PM-1030V v5 2020-10
Copyright © 2020 Quality Machine Tools, LLC
POWER FEED
The PM-1030V gearbox is driven by a train of external gears
taking power from the spindle gear, Figure 3-1. It has a "two-in-
one" output, an 8 TPI leadscrew with a full length key slot. For
thread-cutting operations the saddle is driven by the leadscrew
threads engaging a half-nut on the apron. The key slot pro-
vides an independent means of driving the saddle and cross-
slide for routine turning and facing operations. An advantage
of this arrangement — compared with using the leadscrew for
all power feed functions — is reduced wear on the leadscrew.
The gearbox provides three choices (A, B, C) of leadscrew
speed relative to spindle speed, Figure 3-5. The combination
of gearbox and external gear configurations provides a range
of feed speeds, plus the ability to cut U.S. threads from 8 to 80
threads per inch, and metric threads from 0.35 to 3.9 mm pitch.
A second knob on the gearbox reverses the power feed, driv-
ing the saddle from left to right — and the cross-slide towards
the operator. Reverse power feed is also used to cut left-hand
threads.
Move the spindle back and forth by hand while trying to
ease into mesh.
Speed sensor
Input to the tachometer is from a sensor mounted on the left
hand surface of the headstock, Figure 3-4.
Figure 3-4
Spindle speed sensor
CHUCK REMOVAL & REPLACEMENT
Chucks and faceplates are secured to the PM-1030V spin-
dle by three threaded studs and nuts, Figures 3-7 and 3-8. A
knurled shutter ring allows the chuck to be removed or re-in-
stalled with the nuts in place — more convenient than if the
nuts would need to be reattached in the small gap between
spindle nose and headstock.
Before using tools at the headstock end of the lathe it is a good
idea to protect the bed, Figure 3-6.
Figure 3-6
Protect the bed when removing or replacing a chuck
Chucks, faceplates and wrenches can seriously damage the bed if
dropped.
Chuck removal
Loosen, but do not remove, the three hex nuts behind the
knurled black shutter ring, Figure 3-7. (Do NOT unscrew the
hex heads securing the chuck to its backing plate.) While
holding the chuck with one hand, rotate the shutter ring count-
er-clockwise about one-eighth of a turn (top of knurled ring to-
ward you). Remove the chuck. It may need to be tapped lightly
with a dead-blow non-marring mallet.
Chuck replacement
Reverse the above steps, taking care that the shutter ring is
fully clockwise before tightening the nuts.
Be sure the nuts are fully tightened before powering up.
Disconnect power from the lathe!
Stop the motor before reversing feed direction!
Do not change feed rate A-B-C while machine is run-
ning at high speed!
Figure 3-5
Gearbox front panel
If in doubt, stop the motor before changing feed rate.