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Figure 3-5 Y-axis locks
X-AXIS POWER FEED
Power lamp
The power lamp, a small LED on the right-facing sur-
face, lights when the Power switch is on.
Figure 3-6 X-axis power feed
Direction lever
Before setting the lever to L or R, make sure the X-axis
locks are FREE, and the speed control is fully counter
clockwise (zero speed).
Rapid Traverse
Press the Rapid Traverse button (momentary type) to
drive the table rapidly in the direction set by the L-R le-
ver.
Reset button
If the power feed unit draws more than 3.5 amps for more
PM-940M 0-206 v.indd
than 0 seconds, the overload switch will cut power and
the reset button will pop out. Press the STOP button on
the main control box to disconnect power. Investigate
and resolve power feed problems – such as X-axis locks
not free, or gears too tightly engaged. Allow a cooling
interval, press the reset button, then restore power.
Limit switch
Stop blocks on the front surface of the table can be in-
dependently set to limit left-right travel, Figure 3-4, (3).
To reposition a stop block, loosen its attachment screw,
then tap it if needed to free the square nut in the dovetail
slot. (Slot dimensions: 0 degree sides, 0.3" deep, width
tapers from approx. 0.5" to 0.4".)
X & Y-AXIS POSITIONING BY COUNTING
DIVISIONS
For all spindle positioning operations, with or
without DROs, avoid using the quill lock.
Why? On vertical mills of this type, including the heavier
knee mills, locking the quill may offset the spindle by one
or two thousandths of an inch. If the edge of the work-
piece has been "found" in the quill-locked condition, this
will affect placement of holes drilled thereafter. Instead,
lower the quill with the fine downfeed control. This is
worm driven, so it stays where it's put without locking.
NOTE: This does not apply to operations calling for pre-
cise depth control, such as milling. For such operations
the quill must be locked to maintain a given depth of
cut.
Y-axis positioning is illustrated by Figure 3-7. A hole is
to be drilled 0.25" on the Y-axis relative to the front edge
of a workpiece in a vise, or otherwise clamped to the
table.
Figure 3-7 Spindle positioning example
.
Install an edge-finder in collet or chuck (a tip diam-
eter of 0.2" is assumed).
3
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