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Precision matthews PM-727M Manual
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Precision Matthews PM-727M is a sturdy, full-featured milling machine built for everyday use in workshops. Designed for demanding applications, it weighs nearly 500 pounds and includes a worm-driven quill downfeed with graduated dial and DRO for precision cutter depth control. Its six spindle speeds (115-1700 rpm) are provided by an oil-filled gearbox and the headstock can tilt 45° clockwise or counter-clockwise from the vertical.
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Model PM-727M Precision milling machine 6-speed gear head 1 HP, 110V single phase motor DRO for precise downfeed measurement Square column design Heavy cast iron construction Welded steel stand & cabinet Total weight 485 lbs 701 Parkway View Drive Pittsburgh, PA 15205 PM-727 Manual 2015 v2.docx 1 New installation? After uncrating the mill, please pay attention to the following: Read the installation instructions at the BACK of this manual. Handling the mill is at least a two-man job. Hand-crank 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 (Z axis leadscrew maintenance) Power requirement is 110V, 60Hz, 1φ, 15A circuit protection (spindle motor 16A, full load). 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 firm footing. 2. There are no clamps or locks on moving parts. 3. The gearbox contains oil – check the sight glass at right of the headstock. 4. The gear levers are set for the lowest speed: Hi-Lo to L, 2-3-1 to 1. 5. The gears are fully engaged – hand-rotate (jiggle) the spindle forward and back while applying light pressure on each gear lever, listening for the click as the gears engage. This manual contains essential safety advice on the proper setup, operation, maintenance, and service of the PM-727M milling machine. 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 mill. As the owner of the mill you are solely responsible for its proper installation and safe use. Consider the material contained in this manual to be advisory only. Precision Matthews, LLC cannot be held liable for injury or property damage during installation, or from negligence, improper training, machine modifications or misuse. This manual describes PM-727M machines as shipped from January 2015. There may be detail differences between your specific machine and the information given here (with little or no impact on functionality). If you have questions about any aspect of the manual or your machine, please call 412-787-2876 (east coast time), or email us at [email protected]. Your feedback is welcomed! PM-727 Manual 2015 v2.docx 2 Section 1 INTRODUCTION MODEL 727M Milling Machine features and specifications General information The 727M is a robust "square column" mill designed for day-in, day-out use in the model shop. With an all-up weight of almost 500 lbs lbs it 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 reversible spindle runs in high-quality (ISO355) tapered-roller bearings enclosed in a 2-1/2" diameter quill with coarse and fine downfeed options. An oil-filled gearbox provides 6 spindle speeds from 115 to 1700 rpm. Scraped dovetailed ways for table and headstock ensure smooth, precise motion in all three axes (X = table o left/right, 15 in. Y = table front/back, 8-1/2 in. Z = headstock up/down, 16 in.). The headstock can be tilted 45 clockwise and counter-clockwise from the vertical. Supplied accessories R8-JT33 drill chuck arbor 1/2" (13mm) JT33 keyed chuck (if ordered) Spindle lock C-wrench T-bolts for vise hold-down Oil bottle Floor plan Working clearances – space requirements for full motion of the table PM-727 Manual 2015 v2.docx 3 Dimensions Weight, including welded stand Size, including stand Stand footprint Tray 485 lb net, 560 lb shipping W 40 in. x D 26-1/2 in. x H 70 in. W 14-1/2 in. x D 21-1/4 in. W 23-1/4 in. x D 26-1/4 in. Electrical Power requirement Spindle motor Full load current 110V, 60 Hz, 1 phase Cap-start induction, 900W (1 HP), 1720 rpm 15.6A Headstock Vertical travel Left-right tilt 16 in. 45° - 0° - 45° Spindle Speeds (rpm) Internal taper Top end Quill travel Quill diameter Spindle nose to table Spindle centerline to front face of column Drawbar 115, 220, 320, 600, 1120, 1700 R8 6 splines, 22 mm OD 3 in. 2.45 in. 2-1/2" to 18-1/4 in. 7-3/4 in. 7/16 - 20, 16 mm wrench Table Size Surface height over floor Maximum load Leadscrews Left-right travel (X-axis) Front-back travel (Y-axis) T-slots (3) W 27-1/2 in. x D 7-1/4 in. Approx 36 in. 200 lb Acme, inch pitch, 10 tpi 15 in. 8-1/2 in. 12 mm wide, 63 mm centerlines Approximate T-slot dimensions PM-727 Manual 2015 v2.docx 4 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 flying particles). Wear proper apparel and non-slip footwear – be sure to prevent hair, clothing or jewelry from becoming entangled in moving parts. Gloves – including tight-fitting 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 motion 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 operations such as oiling or adjustments. Maintain the machine with care – check lubrication and adjustments 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 everything. You cannot be too careful! PM-727 Manual 2015 v2.docx 5 Section 2 USING THE MILL FRONT PANEL CONTROLS Connect the mill to a 110Vac outlet. The Power lamp, top center, should light indicating that the control circuit is energized. The E-stop button, bottom right, disconnects the control circuit completely, but it should be used only for its intended purpose – emergency disconnect. The E-stop button is not momentary. Once in, it stays in until twisted clockwise. 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) Off = Stop SPINDLE SPEEDS This is a gear-head machine with a constant speed motor and a two-stage gearbox providing a choice of six spindle speeds. The first stage (L-H) selects the speed range, high or low, and the second stage (1-32) selects a specific speed within that range. Figure 2-1 Motor controls, gear-shift knobs and DRO Before switching on the spindle motor, be sure that both stages are properly engaged. Hand-rotate (jiggle) the spindle forward and back while applying light pressure on each gear-shift knob, listening for the click as the gears engage. Allow the spindle to stop completely before shifting gears Spindle speeds (rpm) L-1 115 L-2 220 L-3 320 H-1 600 H-2 1120 H-3 1700 Excessive cutter noise, chatter, poor finish and tool wear are often the result of too high a feed rate, and/or too high a spindle speed. If unsure, go slow! PM-727 Manual 2015 v2.docx 6 INSTALLING AND 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. Two tools are required to install or remove R8 tooling: a 16 mm wrench for the drawbar nut, and the supplied C-wrench which engages in a slot at the bottom end of the spindle. To install: Hand-thread the drawbar into the R-8 device until the washer, arrowed in Figure 2-2, is seated on the splined spindle. Lock the spindle with the C-wrench while at the same fully tightening the drawbar. To remove: Protect the table under the spindle with rags or scrap wood. Lock the spindle with the Cwrench, loosen the drawbar one half turn or less, 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. Keep in mind that 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. Figure 2-2 Spindle and drawbar Replace the drawbar cap to protect bearings and spline. MOVING THE TABLE Conventionally, left-right movement of the table is said to be along the X-axis (also called "longitudinal travel" or "traversing"). Front-back movement is on the Y-axis, sometimes called "cross travel". Each axis has a leadscrew with handwheel and graduated dial with 0.001" divisions, Figure 2-3. If the mill is not equipped with digital readouts (DROs), the table can be accurately positioned by counting whole turns and divisions, keeping leadscrew backlash 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. For example: Figure 2-3 Y-axis handwheel, X-axis locks A hole is to be drilled exactly 0.25" on the Y-axis relative to the front edge of a workpiece in a PM-727 Manual 2015 v2.docx 7 vise, or otherwise clamped to the table, Figure 2-5. . 1. Install an edge-finder in collet or chuck (a tip diameter of 0.2" is assumed). 2. Lock the X-axis by tightening both screws, Figure 2-3. 3. If the reference edge is to the back the spindle centerline, do nothing; if not, rotate the Y-axis handwheel clockwise to send the workpiece backwards (toward the column). 4. With the spindle running, lower the quill as necessary, then bring the table forward (counter-clockwise), stopping at the point where the edge-finder just makes contact (the tip jumps out of line). Stop the spindle. 5. While holding the Y-axis handwheel to prevent movement, zero the dial. 6. Raise the quill, then rotate the handwheel one exact full turn counterclockwise (0.1") to bring the reference edge to the spindle centerline. 7. Rotate the handwheel 2-1/2 turns counter-clockwise to bring 50 on the dial opposite the datum; the spindle is now 0.25" to the back of the reference edge. Figure 2-4 Y-axis locks Figure 2-5 Spindle positioning example PM-727 Manual 2015 v2.docx 8 QUILL DOWNFEED The quill is controlled in two different ways, coarse and fine. 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 lever hub is disengaged, and the quill is controlled by the fine downfeed handwheel. The quill is locked by a lever on the left of the headstock, see page 1. Coarse feed (Figure 2-6) For drilling operations, loosen knob (4), allowing the lever hub to rotate independently of sleeve (3). Fine feed (Figure 2-6) For milling operations calling for precise, repeatable control of tool depth, tighten knob (4) to engage hub (1) with the internal taper on sleeve (3). Tighten the Z-axis locks, Figure 2-8. Rotate the fine control knob (2) to raise or lower the quill. Lower the quill by rotating the fine control knob clockwise ??, positioning it precisely either by counting divisions on the graduated dial, or by reference to the digital readout (DRO), Figure 2-1. Use the locking lever left of the headstock to hold the quill firmly in position. Figure 2-6 Quill downfeed controls The quill pinion is driven by the lever hub (1). The fine control knob (2) is connected by a worm gear to the 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). If division-counting, be aware of backlash in the worm drive. This means that the handwheel must always be turning in the same direction throughout the entire process, from setting a reference level to subsequent cutting passes at specific depths – see the backlash discussion in "Moving the table", above. Using the DRO – which has no backlash issues – is less laborious, but remember that the quill is spring-loaded. This calls for care when releasing the quill locking lever prior to repositioning the quill downward. If the fine control knob has been allowed to disengage (backed off counter clockwise ??), the quill will jump up by 0.01" or more. To avoid this, make sure the fine control is firmly clockwise, lightly loading the quill rack, before releasing the locking lever. DRO The DRO is in metric mode when switched on. Press the mm/in button to display inches. By pressing and holding the Up arrow (incrementing) or Down arrow (decrementing) the display can be set to a chosen value. The longer the buttons are held down, the faster the change in displayed value. Zero the display at any time by pressing the ON/O button. Switch off the DRO when not in use! Replace the battery by sliding the cover (small arrow) to the right. For longer battery life use a 1.5V silver oxide battery, SR44 or equivalent. PM-727 Manual 2015 v2.docx 9
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Key Features
- Square column design
- Heavy cast iron construction
- Worm-driven quill downfeed with DRO
- 6 spindle speeds (115-1700 rpm)
- Headstock tilts 45°
- R8 spindle taper
- 15” X-axis travel
- 8.5” Y-axis travel
- 16” Z-axis travel
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Frequently Answers and Questions
What is the maximum load capacity of the PM-727M table?
The PM-727M table has a maximum load capacity of 200 pounds.
What type of spindle taper does the PM-727M have?
The PM-727M has an R8 spindle taper.
How much travel does the PM-727M have in the X, Y, and Z axes?
The PM-727M has 15 inches of X-axis travel, 8.5 inches of Y-axis travel, and 16 inches of Z-axis travel.
What is the power requirement for the PM-727M?
The PM-727M requires a 110V, 60Hz, 1 phase power supply with 15A circuit protection.