22
PM-1440BV v3 2020-10
Copyright © 2020 Quality Machine Tools, LLC
Figure 4-14
Cross slide leadscrew nut
(representative)
FOOT BRAKE
There is no physical brake in the drive train. Instead, when the
treadle-operated switch (Figure 4-16) opens, the VFD disables
the motor drive and dumps motor power to a braking resistor,
see Section 5 electrical schematic.
SPLIT NUT ADJUSTMENT
In thread-cutting operations, if the split nut becomes exces-
sively loose — appreciable side to side movement — this may
be corrected by adjusting the gib at the right side of the apron.
Remove the threading dial, then tighten the three gib screws
as necessary, Figure 4-15.
Over-tightening can make disen-
gagement of the split nut difficult.
Figure 4-15
Split nut gib screws
Figure 4-16
Foot brake switch
Figure 4-13A
Handwheel attachment schematic
Figure 4-13B
Handwheel attachment
