Precision matthews PM-940M Manual

Heavy duty

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PM-940M v7 2021-03

Heavy duty milling machine

Weight (including cast iron stand) 1300 lbs

Z-axis motor

(headstock elevation)

Control box

(movable for

best viewing

location)

Table

power feed

Model PM-940M

6-speed gear head

9-1/2 x 40 inch table

Powered table (X axis)

Powered headstock (Z axis)

Power downfeed version available

Quill DRO & depth stop

2 HP (1.5 kW) 220

Vac spindle motor

Spindle speed

selection

Fine downfeed

Quill DRO

Coarse downfeed

& power down-

feed (if installed)

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Summary of Contents for Precision matthews PM-940M

Page 1 Vac spindle motor Z-axis motor (headstock elevation) Spindle speed selection Control box (movable for best viewing location) Coarse downfeed & power down- feed (if installed) Fine downfeed Quill DRO Table power feed PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 2 Circuit breaker tripped? This manual contains essential safety advice on the proper setup, operation, maintenance, and service of the PM-940M mill. 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.
Page 3: Section 1 Features & Specifications
General information The PM-940M is a robust “square column” mill designed for day-in, day-out use in the busy model shop. With an all-up weight of over 1300 lbs it can handle far more than the typical small machine, including end mills up to 1-1/4”...
Page 4 Acme, inch pitch, 10 tpi Left-right table traverse (X-axis)* 26 in. Front-back cross travel (Y-axis)* 12 in. T-slots (3) 14 mm wide, 80 mm centerlines * DRO installation may limit these numbers T-slot dimensions PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 5: Section 2 Installation
6. The gears are fully engaged – hand rotate the spindle forward and back while applying light pressure on each lever, listening for the click as gears engage. Remove the Z-axis crank handle before moving the head- stock under power PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 6 UNCRATING THE MILL The PM-940M is shipped in two packing cases. Uncrat- ing the stand is straightforward. If available, use a forklift to handle the mill; if not, an engine hoist such as that shown in Figure 2-3 may be used.
Page 7 40” long. These will span Figure 2-6 Holes for lifting rods the stand (hole locations arrowed in Figure 2-6) with 8 Holes, total 4, are in similar locations at back and right side PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 8 Tighten the screws, then crank the X handwheel to remove the paper. REMOVE the crank handle before running the motor Do not power the X-axis motor at this time! PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 9: Power-Up Procedure
Expect to hear a click from the control box when The machine should now be ready for normal opera- tions. Up is selected. This is one of the two Z-axis motor PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 10 • Clean the machine routinely – remove chips by brush or vacuum, not com- pressed air (which can force debris into the ways). No list of precautions can cover everything. You cannot be too careful! PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 11: Section 3 Using The Mill
– emergency disconnect. PM-940M vs. PM932M Once the E-stop button is pushed in, it stays in until The PM-940M is a larger version of the PM-932M. The twisted clockwise to release. two mills are similar in many respects. In this manual, •...
Page 12: Installing & Removing Tooling
X-axis is power driven. Separate microswitches, left and right, are actuated by adjustable spring-cushioned stop blocks (3). Be sure to loosen the X-axis lock screws before moving the table, especially under power Figure 3-3 Spindle and drawbar PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 13: X-Axis Power Feed
3. If the reference edge is already to the back the spin- If the power feed unit draws more than 3.5 amps for more dle centerline, do nothing; if not, rotate the Y-axis PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 14 Coarse feed (Figure 3-8) sitioning the quill downward. If the fine control knob has For drilling operations, loosen knob (4), allowing the le- PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 15 Fine feed For surfacing and other milling operations calling for pre- cise tool depth increments, use the fine control hand- wheel. PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 16 It has 120 divisions of approxi- mately 0.002”. Use the DRO for precise downfeed con- trol. On power feed versions the quill is locked by the Figure 3-11 Using the depth collar as a stop PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 17 (0) on the depth collar nears the scale datum. At this point the quill will reverse ABRUPTLY by spring action unless restrained by light finger pressure on one of the levers. PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 18 Bear in mind that this is good only to approximately ± 0.25 , so a more accurate means of angle measurement will be needed if the project calls for precise tilting. PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 19 2. Set the headstock to the approximate zero degree a large-radius fly cutter, exaggerated in Figure 3-19. position on the tilt scale, then tighten the three nuts PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 20 “looser” nut. Now fully tighten both nuts, and re-check again (tightening a nut can itself introduce significant error). An established PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 21: Tapping Operations
Case hardening is recommended, with final fitting using a fine stone or diamond stone. Figure 3-23 Shop-made vise key Dimensions in millimeters PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 22: Section 4 Maintenance
6. When satisfied that the headstock is oil-tight, add oil to the halfway mark on the sight glass (about 3 qts total). 7. Replace the fill plug. Figure 4-1 Headstock drain plug PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 23: Quill Rack & Pinion
If you loosen one, tighten the other. Remove the pleated way covers for access to Figure 4-5 Gib screw: X axis left the back of the Y gib and bottom of the Z gib. PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 24 4. Step the housing round to the next notch, then run in the M6 screw by hand to secure the housing. Test for tension. 5. Repeat as necessary, then fully tighten the retaining screw. PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 25 Overheating can be due to excessive grease, see above, or an over- tight spanner nut at the upper end of the spindle. Call Precision Matthews for guidance. PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 26: Section 5 Parts
Z6507 Screw: M8 1.25, shoulder Z6517 Fine feed hub (worm gear) Z6508 Screw: M5 Z6518 Pinion shaft Z6509 Screw: M5 0.8 x 8, Ph Z6519 Coarse feed hub Z6510 Z6520 PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 28 Screw: M3 x 8 Z6584 Pin: 3 x 24 Z6615 Spanner nut: M30 x 1.5 Z6552 Spring Z6585 Drawbar, 7/16-20 Thd Z7699 Rubber quill seal Z6553 Gear shift knob Z6586 PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 29 Retaining ring, ext 35 Z6650 Gear Z6627 Gear Z6639 Retaining ring, int 62 Z6651 Ball bearing Z6628 Gear Z6640 Collar Z6652 Key: 6 x 14 Z6629 Gear Z6641 Screw: M8 x 20 Z6653 PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 32 1. If the power downfeed is OFF, handwheel 59 and agram, to engage the smaller of the two spindle drive shaft 46 are stationary, holding worm gear 16 stationary. gears, 33 in Headstock-2. PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 33 10 to the right, but has no other effect provided position of shaft 22, the inner end of which slides within the clutch is released at the zero-depth line by pins 5 PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 34 (23) so that it pops up through the slot gear at any given setting. in 20 to engage the keyway of the gear in line with its tip. Power downfeed schematic PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 35 8 in the depth collar 3, right). At the desired end-point of the downfeed ('0' on the depth collar), ramp pin 5 pushes on ball-headed pin 7, above right, to disengage the drive. PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...
Page 37 Screw: M8 x 20 Z6792 Y-axis leadscrew nut Z6757 Z-axis clutch assembly Z6793 X-axis flange, RH Z6758 Gear Z6794 X-axis flange, LH Z6759 Table power feed assembly Z6795 X-axis leadscrew Z6760 PM-940M v7 2021-03 Copyright © 2021 Quality Machine Tools, LLC...

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