Quality Machine Tools PM-940M Manual

Heavy duty milling machine

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Quality Machine Tools, LLC

70 Parkway View Drive

Pittsburgh, PA 5205

PM-940M 0-206 v.indd

Heavy duty milling machine

Weight (including cast iron stand) 300 lbs

Z-axis motor

(headstock elevation)

Control box

(movable for

best viewing

location)

Table

power feed

Model PM-940M

6-speed gear head

9-/2 x 40 inch table

Powered table (X axis)

Powered headstock (Z axis)

Power downfeed version available

Quill DRO & depth stop

.5 HP (. kW)

220 Vac spindle

motor

Spindle speed

selection

Fine downfeed

Quill DRO

Coarse downfeed

& power down-

feed (if installed)

Summary of Contents for Quality Machine Tools PM-940M

Page 1 Control box (movable for best viewing location) Coarse downfeed & power down- feed (if installed) Fine downfeed Quill DRO Table power feed Copyright © 206 Quality Machine Tools, LLC 70 Parkway View Drive Pittsburgh, PA 5205 PM-940M 0-206 v.indd...
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 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 ovr 300 lbs it can handle far more than the typical small machine, including end mills up to -/4”...
Page 4 400 lb, table-centered, less if overhanging Leadscrews 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 0-206 v.indd...
Page 5 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 0-206 v.indd...
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 or Holes, total 4, are in similar locations at back and right side PM-940M 0-206 v.indd...
Page 8 Install and tighten the four bolts. ing down on the assembly. 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 0-206 v.indd...
Page 9 Refill the gearbox with the recommended oil, see Section 4 The machine should now be ready for normal opera- Expect to hear a click from the control box when tions. Up is selected. This is one of the two Z-axis motor PM-940M 0-206 v.indd...
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 0-206 v.indd...
Page 11 – 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 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 0-206 v.indd...
Page 13 L-R le- ver. Figure 3-7 Spindle positioning example Reset button Install an edge-finder in collet or chuck (a tip diam- If the power feed unit draws more than 3.5 amps for more eter of 0.2” is assumed). PM-940M 0-206 v.indd...
Page 14 – see the backlash dis- gaged, and the quill is controlled by the fine downfeed cussion in “Moving the table”, above. Using the DRO handwheel. The quill is locked by a lever at lower right of PM-940M 0-206 v.indd...
Page 15 Re-tighten the depth collar clamp lever. Unlock the quill. While observing the DRO reading, raise and lower the quill a few times to be sure the quill stops at the desired end point. PM-940M 0-206 v.indd...
Page 16 Lower the quill to the desired depth by rotating the fine control handwheel clockwise (only). Tighten the quill locking lever. Figure 3- Using the depth collar as a stop PM-940M 0-206 v.indd...
Page 17 — levers pivot inward — when the zero line pressure on the downfeed levers. (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 0-206 v.indd...
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 0-206 v.indd...
Page 19 Disconnect power. or as a scalloped effect when surfacing a workpiece with Set the headstock to the approximate zero degree a large-radius fly cutter, exaggerated in Figure 3-9. position on the tilt scale, then tighten the three nuts PM-940M 0-206 v.indd...
Page 20 Re- peat the process as often as necessary for the desired accuracy, progressively tightening the “looser” nut. Now fully tighten both nuts, and re-check again (tightening a nut can itself introduce significant error). An established PM-940M 0-206 v.indd...
Page 21 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 0-206 v.indd...
Page 22 When satisfied that the headstock is oil-tight, add oil to the halfway mark on the sight glass (about 3 qts total). Replace the fill plug. Figure 4- Headstock drain plug PM-940M 0-206 v.indd...
Page 23 BOTH screw heads must be tight against the gib ends. 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 0-206 v.indd...
Page 24 Step the housing round to the next notch, then run in the M6 screw by hand to secure the housing. Test for tension. Repeat as necessary, then fully tighten the retaining screw. PM-940M 0-206 v.indd...
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 0-206 v.indd...
Page 26 Find downfeed handwheel Retaining ring: 14, Ext 20305-1B Handle 20120 Spacer 20305-2B Screw: M8 1.25, shoulder 20016 Fine feed hub (worm gear) Screw: M5 20117 Pinion shaft Screw: M5 0.8 x 8, Ph 20013 Coarse feed hub PM-940M 0-206 v.indd...
Page 27 HEADSTOCK (1) PM-940M 0-206 v.indd...
Page 28 Washer ZX40-20021 Depth block Butterfly spring ZX40-20132 Depth pointer ZX45L-2203 Washer Screw: M3 x 8 6201 Ball bearing Pin: 2 x 16 ZX45L-2201 Power feed take-off shaft Screw: M8 x 30 ZX45L-2202 Bush Pin: 3 x 24 PM-940M 0-206 v.indd...
Page 29 HEADSTOCK (2) SPINDLE DRIVE TRAIN PM-940M 0-206 v.indd...
Page 30 Retaining ring, ext 18 Retaining ring, int 62 Key: 5 x 56 ZX45L-2205 Collar Screw: M5 x 10 Screw: M8 x 20 ZX40-20107B H-L shaft DRIVE TRAIN SCHEMATIC PM-940M 0-206 v.indd for illustration. Actual sizes of the headstock output gear...
Page 31 PM-940M 0-206 v.indd...
Page 32 POWER DOWNFEED PM-940M 0-206 v.indd...
Page 33 . If the power downfeed is OFF, handwheel 59 and shaft 58 (Headstock-); this raises gear 40, same dia- shaft 46 are stationary, holding worm gear 6 station- gram, to engage the smaller of the two spindle drive ary. PM-940M 0-206 v.indd...
Page 34 This 2. A pinion on feed rate selector shaft 37 controls the position of shaft 22, the inner end of which slides within drives 0 to the right, but has no other effect provided PM-940M 0-206 v.indd...
Page 35 (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 0-206 v.indd...
Page 36 Pin 8 in the casting is the coarse downfeed stop (it meets pin 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 0-206 v.indd...
Page 37 Z-axis motor Screw: M8 x 25 ZX45L-1106 Column cap PM940M-1102 Saddle Screw: M8 x 20 ZX40-10012 Table ZX45L-1204 Z-axis clutch assembly ZX40-10202 X-axis leadscrew nut Gear ZX40-10203 Y-axis leadscrew nut Table power feed assembly ZX40-10020 X-axis flange, RH PM-940M 0-206 v.indd...
Page 38 BASE PM-940M 0-206 v.indd...
Page 39 COLUMN PM-940M 0-206 v.indd...
Page 40 PM-940M 0-206 v.indd...
Page 41 Control box front Electrical box Control box rear 200µF 25µF Spindle motor capacitors PM-940M 0-206 v.indd...