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PM-30MV v3 2020-10
Copyright © 2020 Quality Machine Tools, LLC
INSTALLING THE TABLE (X-AXIS) POWER FEED
The power feed available from Precision Matthews is powered
by the standard 110Vac 60 Hz supply. It comes with a com-
plete manual and all mounting hardware. The outline descrip-
tion and photos on this page show the power feed unit installed
on the PM-30MV.
Figure 4-8
Power feed unit as shipped
This is the underside of the unit. The pre-installed gray casting at top
is referred to in the power unit manual as the “Big Adapter”. The drive
gear is arrowed.
Figure 4-10
Install the power feed unit
Slide the unit down to engage the two pinions. Snug the hex head
screws, but don’t fully tighten.
Figure 4-9
Install the adapter bracket and leadscrew gear
Remove the left-hand handwheel. Install the large gear on the
leadscrew to engage the three “dog teeth”, inset. Tighten the set screw
in the gear. The bracket shown here is referred to in the power unit
manual as “Small Adapter”. It is secured by two M8 hex head screws
(not shown) bearing on the left hand edge of the mill table. Do not
over-tighten
the Small Adapter screws! Slots on the “Big Adapter”,
together with the two out-facing M8 screws, allow vertical adjustment
to optimize engagement of the two gears.
Do not connect 115 Vac power until you have tried
manual feeding (right hand handwheel) to check for
proper engagement of the gears
Gear engagement
“Proper engagement” is hard to specify. The separation that should
exist between the gears can be gaged in several ways, one easy way
being to insert a scrap of standard printer paper (usually about 0.004”
thick) into the mesh, then crank the right hand handwheel. Lower the
power feed unit to the point where the paper feeds through the gears
with some resistance — but without binding. Once the paper is ejected
the gears should be properly meshed.
Lubricate the gears with NLGI No. 2 grease!
Be sure the X-axis (table) locks are free.
Connect 110Vac power. Run the power feed unit
slowly
in both direc
-
tions. If gear noise is an issue, try raising or lowering the power feed
unit — but don’t expect a totally silent drive (these are straight-cut
gears). Tighten the hex head screws, Figure 4-9.
Figure 4-11
Install the gear cover
Figure 4-12
Install the limit switch components
To install the travel stop bumpers, left and right, it may be necessary to
grind the T-nuts so they fit in the dovetail slot (arrowed) on the facing
surface of the table. Install the limit switch in place of the table position
marker post. Set the limit switch to align with the travel stop bumpers.
Figure 4-14
Install the limit switch cover
The cover has internal springs. Be sure they are in line with the limit
switch plungers. When properly installed the cover should be freely
movable from side to side with a small amount of spring resistance.