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Section 3 USING THE MILL
MILL SIMILARITIES
PM-940M vs. PM932M
The PM-940M is a larger version of the PM-932M. The
two mills are similar in many respects. In this manual,
photos of the PM-932M are used to illustrate features
of the PM-940M. Aside from slight variations in appear-
ance, such as the type of spindle motor, key differences
between the two mills are:
.
Gear selectors (spindle speed) are on the left side of
the PM-940M headstock,vs. front panel for the PM-
932M.
2.
The quill locking lever is left of the headstock for
power downfeed versions of both mills. Mills without
power feed have a front-mounted locking lever.
3.
The Z-axis motor (headstock elevation) is controlled
by a single rotary switch on the PM-940M, by sepa-
rate UP/DOWN buttons on the PM-932M.
4.
The control box is attached directly to the left side of
the PM-932M headstock; it is suspended from a mov-
able beam on the PM-940M.
ELECTRICAL CONTROLS
Figure 3- PM-940M control box
•
Connect the mill to a 220Vac outlet. Press the Power
lamp switch, top center, to energize the control circuit
(the green lamp should light). This is a latching switch
– press once to energize, press again to de-energize.
•
The E-stop button, bottom right, is in series with the
Power switch. Like the Power switch it de-energizes
PM-940M 0-206 v.indd
the control circuit completely, but it should be used
only for its intended purpose – emergency disconnect.
Once the E-stop button is pushed in, it stays in until
twisted clockwise to release.
•
The spindle drive motor is controlled by a rotary
switch:
F = Forward (clockwise, looking down, used for most
milling/drilling operations)
R = Reverse (counter-clockwise, looking down)
S = Stop
• Before switching on the spindle motor, be sure
that both stages are properly engaged. Hand-rotate
(jiggle) the spindle forward and back while applying
light pressure on each gear-shift knob, listening for the
click as the gears engage.
Allow the spindle to stop completely before shift-
ing gears
SPINDLE SPEEDS
This is a gear-head machine with a constant speed mo-
tor and a two-stage, six speed gearbox. The first stage
(L-H) selects the speed range, high or low, and the sec-
ond stage (2-3-1) selects a specific speed within that
range.
L-1
90
L-2
20
Spindle
L-3
345
speeds
H-1 670
(rpm)
H-2 80
H-3 970
Figure 3-2 Speed selector knobs
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