Precision matthews PM-727M Manuale utente
1PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
Models PM-727M & PM-727V
Precision milling machines
PM-727M 6-speed gear head (6 set speeds)
PM-727V 6-speed gear head (6 speed ranges,
innitely adjustable speed in each range)
110Vac power
Quill DRO for precise downfeed measurement
Square column design, dovetail ways
Heavy cast iron construction
Optional steel stand & cabinet
Weight including stand 575 lbs
Model PM-727M (ac induction motor)
Model PM-727V (brushless dc motor)
Tachometer Speed
control
Spindle
direction:
Forward/
Reverse
Stop
spindle
(OFF)
Power
switch
2
PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
FAQ
This manual contains essential safety advice on the proper setup, operation, maintenance, and service
of the PM-727M and PM-727V mills. Failure to read, understand and follow the manual may result in
property damage or serious personal injury.
There are many alternative ways to install and use a milling machine. As the owner of the machine you
are solely responsible for its proper installation and safe use. Consider the material contained in this man-
ual to be advisory only. Quality Machine Tools, LLC cannot be held liable for injury or property damage
during installation or use, or from negligence, improper training, machine modications or misuse.
This manual describes PM-727 machines as shipped from January 2015. There may be detail
dierences between your specic machine and the information given here (with little or no impact
on functionality). Please email us if you have questions about any aspect of the manual or your
machine (see our website www.precisionmatthews.com for support addresses). Your feedback is
welcomed!
The collet locating screw could
be in too far. Back it out a little.
R8 collets won’t go
into the spindle
Copyright © 2020 Quality Machine Tools, LLC
This material was originated by Precision Matthews. No portion of
the manual may be reproduced or distributed in any form without
the written approval of Quality Machine Tools, LLC.
My mill doesn’t
run at all
110 Vac power connected?
Power lamp lit? (Press the
Power push-button lens)
E-Stop button in? (pop it out
by twisting rmly to the right.)
Fuse good?
PM-727M shown above.
The PM-727V panel, left,
is labeled dierently
(727V Forward = 727M
Left, Reverse = Right).
3PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
New installation?
These are the points to watch out for!
But read the whole manual for specics
After uncrating the mill, please pay attention to the following:
• Handling the mill is at least a two-man job.
• Read the installation instructions, Section 2 of this manual.
• Handling the mill is at least a two-man job.
• Lower the center of gravity by cranking the headstock down
until the spindle nose is just clear of the table.
• Lifting gear – sling, hoist or forklift – must be rated for at
least 1000 lb.
Working location of the mill must allow:
1. Full left-right travel of the table.
2. Access to the back of the column for Z-axis leadscrew
maintenance (if against a wall, make sure it can be moved if
access is required).
• Power requirement is 110V, 60Hz, 1φ, 20A circuit protection .
• Extension cord not recommended; if no alternative, use 12
AWG not longer than 20 ft.
Before connecting power be sure that:
1. The machine is on a rm footing.
2. No chuck or collet is installed, and the drawbar is removed.
3. There are no clamps or locks on moving parts.
4. The gearbox contains OIL – check the sight glass at right of
the headstock.
5. The gear levers are set for the lowest speed: Hi-Lo to L, 2-3-
1 to 1.
6. The gears are fully engaged – hand-rotate (jiggle) the spin-
dle forward and back while applying light pressure on each
gear lever, listening for the click as the gears engage.
4
PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
Section 1 FEATURES & SPECIFICATIONS
MODEL PM-727M and PM-727V MILLING MACHINES
General information
These are robust “square column” mills designed for use in the model shop. With an all-up weight of almost 600 lbs (includ-
ing the optional stand), they can handle far more than the typical small machine. For precise control of cutter depth there is a
worm-driven quill downfeed with graduated dial and DRO, completely independent of headstock up/down position.
The main dierence between M and V models is the motor — single speed ac (induction type) for PM-727M, variable speed
(brushless dc) for the PM-727V. The V model oers a signicantly wider speed range than the M model, 40-3000 rpm vs. 115-
1700 rpm.
The reversible spindle runs in high-quality tapered-roller bearings enclosed in a 2-1/2” diameter quill with coarse and ne
downfeed options. In the PM-727M an oil-lled gearbox provides 6 spindle speeds from 115 to 1700 rpm. The same gearbox
in the PM-727V provides 6 speed ranges from 40-190 to 1800-3000 rpm. Ground dovetailed ways for table and headstock en-
sure smooth, precise motion in all three axes (X = table left/right, 15 in. Y = table front/back, 8-1/2 in. Z = headstock up/down,
16 in.). The headstock can be tilted 90 degrees clockwise and counter-clockwise from the vertical.
Working clearances – space requirements
for full motion of the table
Approximate T-slot dimensions
5PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
Dimensions
Weight, including optional stand 575 lb net (475 lb without stand)
Size, assembled on stand W 40 in. x D 26-1/2 in. x H 70 in.
Stand footprint W 14-1/2 in. x D 21-1/4 in.
Tray W 23-1/4 in. x D 26-1/4 in.
Electrical
Power requirement 120V, 60 Hz, 1 phase
Spindle motor PM-727M Cap-start induction, 900W (1.2 HP), 1720 rpm
Spindle motor PM-727V Brushless dc, 1125W (1.5 HP), variable speed
Headstock
Vertical travel 16 in.
Left-right tilt 90° - 0° - 90°
Spindle
PM-727M Spindle speed, rpm 115, 220, 320, 600, 1120, 1700
PM-727V Spindle speed, rpm 40-190, 180-380, 350-560, 550-1000, 980-
1860, 1800-3000
Internal taper R8
Top end 6 splines, 22 mm OD
Quill travel 3 in.
Quill diameter 2-1/2 in.
Spindle nose to table 2-1/2” to 18-1/4 in.
Spindle centerline to front face of column 7-3/4 in.
Drawbar 7/16 - 20, 16 mm wrench
Table
Size W 27-1/2 in. x D 7-1/4 in.
Surface height over oor Approx 36 in.
Maximum load, centered 200 lb
Leadscrews Acme, inch pitch, 10 tpi
Left-right travel (X-axis) 15 in.
Front-back travel (Y-axis) 8-1/2 in.
T-slots (3) 12 mm wide, 63 mm centerlines
Model PM-727M and PM-727V specications
ABOUT THIS MANUAL ...
It was written before the PM-727V became available.
Unless otherwise noted, all descriptions, suggestions
and instructions apply equally to both PM-727M and
PM-727V machines. They are identical in all respects
other than the motor, single speed for the M model,
variable for the V.
6
PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
Everyday precautions
• This machine is designed for milling and drilling operations by
experienced users familiar with metal-working hazards.
• Untrained or unsupervised operators risk serious injury.
• Wear ANSI-approved full-face or eye protection at all times
when using the machine (everyday eyeglasses are not reliable
protection against ying particles).
• Wear proper apparel and non-slip footwear – be sure to pre-
vent hair, clothing or jewelry from becoming entangled in mov-
ing parts. Gloves – including tight-tting disposables – can be
hazardous!
• Be sure the work area is properly lit.
• Never leave chuck keys, wrenches or other loose tools on the
machine.
• Be sure the workpiece and machine ways are secure before
commencing milling or drilling – hold-downs and/or vise fully
tightened, X-Y-Z axes locked, cutting tool secured.
• Use moderation: light cuts, low spindle speeds, slow table mo-
tion give better, safer results than “hogging”.
• Don’t try to stop a moving spindle by hand – allow it to stop on
its own.
• Disconnect 110V power from the mill before maintenance op-
erations such as oiling or adjustments.
• Maintain the machine with care – check lubrication and adjust-
ments daily before use.
• Clean the machine routinely – remove chips by brush or
vacuum, not compressed air (which can force debris into the
ways).
No list of precautions can cover ev-
erything. You cannot be too careful!
7PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
Section 2 INSTALLATION
SETTING UP THE MILL
The PM-727M is shipped in two packing cases, one
for the machine, one for the optional stand. The follow-
ing procedure makes use of an engine hoist, minimum
weight rating 1000 lb.
If this is a stand installation, move the stand to the mill’s
working location. Make sure the back of the column will
be accessible for lubrication (working clearances, Sec-
tion 1).
1. Un-crate the mill. Remove the drill chuck, if tted.
2. Lower the center of gravity by cranking the head-
stock down.
3. Tape cloth padding to the underside of the tilt col-
lar.
4. Run a sling under the padding.
5. Hook the sling to the hoist, but do not lift before
completing the next step.
6. Place a wood stretcher under the headstock to hold
the sling away from the capacitor housing, Figure
2-1.
7. Slowly lift the mill, controlling any tendency for it to
swing as it clears the pallet.
8. Roll the mill to its working location, then lower it into
place, Figure 2-2.
9. Secure the mill to the bench or stand. If this is a
stand installation, use the four bolts supplied. The
front two bolt locations are threaded. Use lock
washers and nuts for the back two.
10. Level the mill using the table surface for reference,
shimming as necessary.
Assembly & cleanup
Unnished metal surfaces may be protected in shipping
by thick grease and/or paper. Carefully remove these
using a plastic paint scraper, disposable rags and a
light-oil such as WD-40.
Oil the ways and leadscrews. Check the headstock sight
glass for oil level.
If necessary, install the X-axis handwheels.
Initial checks
Read Section 3 if unsure about any item
1. Connect 110 Vac power.
2. Be sure the E-Stop (Emergency) button is not
pushed in (it pops out when twisted clockwise).
3. If the power lamp is unlit, press the Power button.
Figure 2-2 Lower the mill onto stand or bench
Figure 2-1 Protect the capacitor housing
An 18 inch length of 2 x 4 will reduce pressure on the plastic
case
8
PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
The power lamp should light.
4. Check the emergency function by pressing the E-
Stop button. The power lamp should go out, de-en-
ergizing the contactor circuit, disabling all electrics.
5. Restore power by twisting the E-Stop button rmly
clockwise.
Test run procedure
DO NOT LEAVE THE MACHINE UNATTENDED DUR-
ING THIS PROCEDURE
1. Gear levers set to L and 1 (115 rpm)? Gears fully
engaged? Speed control fully counter clockwise,
PM-727V only.
2. Test the spindle motor by pressing the Left and Right
motor switches in turn.
3. Run the spindle at 115 rpm for a few minutes, then
stop.
4. Select each of the available speeds in turn (L-2, L-3,
H-1, etc.). Check gear engagement each time, then
run for a few minutes.
The machine should now be ready for normal opera-
tions.
Optional
After a few hours of run time you may wish to drain the
gearbox to ush out any residue from the manufacturing
process. Rell the gearbox with the oil recommended in
Section 4.
Allow the spindle to stop com-
pletely before shifting gears
If this doesn’t happen, the E-stop func-
tion is defective, and needs attention
SPEED RANGES (rpm)
L1 40-190
L2 180-380
L3 350-560
H1 550-1000
H2 980-1860
H3 1800-3000
PM-727V USERS PLEASE NOTE ...
Not shown in Section 5:
• Spindle speed is transmitted to the tachom-
eter on the control panel by a sensor locat-
ed adjacent to spindle.
• The electrical schematic does not show the
PM-727V variable speed drive. This replac-
es entirely the motor and motor witching
circuit shown in the schematic.
9PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
Section 3 USING THE MILL
Allow the spindle to stop com-
pletely before shifting gears
L-1 115
L-2 220
L-3 320
H-1 600
H-2 1120
H-3 1700
FRONT PANEL CONTROLS
Connect the mill to a 110Vac outlet. Press the Power
lamp switch, top center Figure 3-1, to energize the
control circuit (the lamp should light). This is a latching
switch – press once to energize, press again to de-en-
ergize.
The E-stop button, bottom right, is in series with the
Power switch. Like the Power switch, it de-energizes
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 the three push
buttons:
Left = Forward (cw, looking down, used for
most milling/drilling operations)
Right = Reverse (ccw, looking down)
O = Stop
SPINDLE SPEEDS
This is a gear-head machine with a constant speed mo-
tor and a two-stage gearbox providing a choice of six
spindle speeds. The rst stage (L-H) selects the speed
range, high or low; the second stage (1-3-2) selects a
specic speed within that range.
Before switching on the spindle motor be sure that
Excessive cutter noise, chatter, poor
nish and tool wear are often the result
of too high a feed rate, and/or too high a
spindle speed. If unsure, go slow!
Spindle speeds (rpm)
INSTALLING & REMOVING TOOLING
The spindle and drawbar are designed for R-8 taper
collets, drill chucks and other arbors with the standard
7/16”-20 internal thread.
When installing or removing R8 tooling, set the spindle
speed to L1 for the best braking action. Alternatively, an
adjustable wrench can be used to grip the ats on the
bottom end of the spindle.
To install: Hand-thread the drawbar into the R-8 device
until the washer, arrowed in Figure 3-2, is seated on the
Figure 3-1 Motor controls, gear shifters & DRO
both stages are properly engaged. Hand-rotate (jiggle)
the spindle forward and back while applying light pres-
sure on each gear-shift knob, listening for the click as
the gears engage.
Figure 3-2 Spindle & drawbar (arrowed)
10
PM-727MV v6 2020-10 Copyright © 2020 Quality Machine Tools, LLC
MOVING THE TABLE
Left-right movement of the table is usually said to be
on the X-axis (a.k.a. “longitudinal travel” or “traversing”).
Front-back movement is on the Y-axis, sometimes called
“cross travel”.
Each axis has a leadscrew with handwheel and gradu-
ated dial with 0.001” divisions, 0.1” per revolution, Fig-
ure 3-3. If the mill is not equipped with digital readouts
(DROs), the table can be accurately positioned by count-
ing whole turns and divisions, keeping leadscrew back-
lash in mind. This means that table motion must always
be in the same direction up to the point of reference,
then on to the desired location, see “Spindle Positioning
by Counting Divisions” later in this section.
Replace the drawbar cap to
protect bearings and spline
Figure 3-3 Y-axis handwheel, X-axis clamp levers
Figure 3-4 Y-axis clamp levers
QUILL DOWNFEED
The quill is controlled in two dierent ways, coarse and
ne.
In the drilling mode, coarse feed, the mill functions like a
standard drill press – pull the upper lever toward you to
lower the quill. For milling operations the 3-lever hub is
disengaged, and the quill is controlled by the ne down-
feed handwheel. The quill is locked by a lever on the left
of the headstock, Figure 3-1.
Figure 3-5 Quill downfeed controls
The quill pinion is driven by the lever hub (1). The ne con-
trol handwheel (2) is connected by a worm gear to sleeve (3),
which is free to rotate — doing nothing to the quill — if it is not
meshed with the lever hub. Do this by tightening knob (4).
Always lock the quill when milling
splined spindle. Fully tighten the drawbar.
To remove: Protect the table under the spindle with
rags or scrap wood. Loosen the drawbar one half turn
or less — holding the spindle with a wrench if necessary
— then tap the top of the drawbar with a brass or dead-
blow hammer to unseat the taper. Unscrew the drawbar
with one hand while supporting the R-8 device with the
other hand.
Why support the R-8 item? Because the table, vises
and workpiece can be damaged by falling tools and drill
chucks. The cutting tool itself can also be damaged in
the same way.
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