Precision matthews PM-1236 Manual
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Precision matthews PM-1236 Manual

High precision gap-bed machine
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Model PM-1236 Lathe
High precision gap-bed machine
36 in. between centers, 2 in. swing over bed, 7-/2 in. over gap
2 HP (500W) motor, 220 Vac single phase
Speed range from 65 to 80 rpm
Power cross-feed, traveling motor controls
D-4 camlock spindle mount, -/2 inch spindle bore
Weight, including stand, 200 lb
PM-1236 with optional coolant system, live center and QC toolpost
70 Parkway View Drive
Copyright © 206 Quality Machine Tools, LLC
Pittsburgh, PA 5205

PM-236 v4 -207.indd

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  • Page 1 Power cross-feed, traveling motor controls D-4 camlock spindle mount, -/2 inch spindle bore Weight, including stand, 200 lb PM-1236 with optional coolant system, live center and QC toolpost 70 Parkway View Drive Copyright © 206 Quality Machine Tools, LLC Pittsburgh, PA 5205...
  • Page 2 Consider the material contained in this manual to be advisory only. Precision Matthews, LLC cannot be held liable for injury or property damage during instal- lation or use, or from negligence, improper training, machine modifications or misuse.
  • Page 3 Section 1 INSTALLATION THESE ARE THE MAIN POINTS TO WATCH OUT FOR! But read the following pages for more information • Handling the lathe is at least a two-man job. • Lifting gear – sling, hoist or forklift – must be rated for at least  ton. •...
  • Page 4 With the RH cabinet in its approximate final location, insert the footbrake pivot shaft, then locate the other end of the shaft in the LH cabinet while easing the cabinet into its final location. Install the front panel on the brackets using four M6 screws, washers and nuts.
  • Page 5 LEVELING the floor. Tighten all four socket heads on the connecting Make sure the lathe is in its permanent location. The sleeve. leveling procedure ensures that the lathe bed is in the While observing the footbrake switch as before, press same state as it was when the lathe was checked for ac- and release the treadle a few times to ensure that the curacy in manufacture —...
  • Page 6 INITIAL CHECKS Check that there are no clamps or locks on moving parts. Check that the footbrake treadle is released (UP). Read Section 3 if unsure about any item in the fol- Set the carriage and cross slide to approximate lowing mid-travel.
  • Page 7 OPTIONAL TEST RUN PROCEDURE ALIGNING THE LATHE Run the spindle for a few minutes, forward and reverse, The most important attribute of a properly set up lathe at a selection of the 9 speeds available for the as-shipped is its ability to “machine parallel”, to cut a cylinder of uni- Vee belt configuration.
  • Page 8 6 in. 3-jaw self centering chuck with two sets of jaws, in-facing and out-facing • 8 in. 4-jaw independent chuck with reversible jaws • Steady rest • Follower rest • Micrometer saddle stop PM-1236 Floor plan: dimensions approximate (not to scale) PM-236 v4 -207.indd...
  • Page 9 PM-1236 SPECIFICATIONS Including stand: Width 61-1/2 in., Height 55 in. Dimensions, approximate overall Depth 19 in. at chip tray, add 8 in. for cross slide Weight (approximate numbers) Lathe 960 lb net, 1020 lb shipping Cabinet, left hand, incl. foot brake linkage 100 lb shipping weight, each Cabinet, right hand, incl.
  • Page 10 Everyday precautions • This machine is intended for use 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 par- ticles).
  • Page 11 Section 3 USING THE LATHE WHAT IS NOT IN THIS SECTION ... • Belt cover (to the left of the headstock). • Footbrake The PM-236 is a conventional engine lathe that re- quires little explanation except for details specific to this particular model —...
  • Page 12 CHUCKS & FACEPLATE motor, Figure 3-4. Raise the motor to de-tension the Vee belts. Move the belts to select the other speed range, The spindle nose on the PM-236 accepts D-4 Cam- then lower the motor to re-tension. Make certain the mo- lock chucks, faceplates and other work holding devices.
  • Page 13 replace the stop screw. • If the cam marker goes beyond the second Vee (6 o’clock), screw the stud IN one more turn, then re- place the stop screw. • If the markers are correctly aligned, repeat the tight- ening sequence as step 3, light force. Repeat the sequence two more times, first with moderate force, then fully tighten.
  • Page 14 Figure 3-9 Cross slide and compound dials Figure 3-0 Tailstock TAILSTOCK The tailstock leadscrew is 0 TPI, with a travel of 4 A visual indication of the offset is provided by the scale, inches. Like the compound, the tailstock has two gradu- but this is not a reliable measure for precise work.
  • Page 15 . It provides a useful range of carriage and cross feeds, respectively (in./rev) carriage 0.009 to 0.02, cross slide 0.0004 to 0.0023. 2. It cuts 0 of the most popular U.S. threads found in the model shop, simply by making gearbox selections. In addition, the 24T/48T combination cuts the entire range of metric pitches from 0.4 to 7 mm.
  • Page 16 ENGAGING THE POWER FEED Power feed controls are located on the apron, Figure 3-4. The split-nut lever engages the leadscrew, and is typically used only for thread cutting (S-M knob on gear box set to M), described later. The power feed lever is active only when the feed shaft is rotating, S-M knob on gear box set to S.
  • Page 17 COMPOUND SETUP FOR THREAD CUTTING Thread cutting on the lathe is unlike most other turning operations, for two reasons: . The cutting tool must be precisely ground with an included angle of 60 degrees for most American and metric threads, and; 2. It is pref- erable to feed the tool into the workpiece at an angle so it cuts mostly on the left flank of the thread.
  • Page 18 and lower gear shafts. a precise included angle of 60 . It is installed so that its • Remove the gears, washers, keys and bushing (lower flanks are exactly 30 either side of the cross axis, ideal- gear only). ly with the compound offset as Figure 3-7. Single-point threads are cut in 0 or more successive passes, each •...
  • Page 19 Figure 3-20 Gear- THREADS PER INCH box and external gear selections UPPER Speed for standard GEAR 24T threads Gearbox Lower gear 48T, exceptions in THREADS PER INCH 4-1/2 9-1/2 5-1/2 6-1/2 7-1/2 Speed UPPER GEAR 48T Gearbox Lower gear 24T, exceptions in Figure 3-2 Using the threading dial Line Line...
  • Page 20 THREAD CUTTING (METRIC THREADS) Practically all metric thread pitches from 0.4 mm to .75 mm are cut with one external gear setup: 24T upper, Figure 3-23 48T lower. For thread pitches from .6 mm to 7 mm, the Metric setup inverse setup is used: 48T upper, 24T lower.
  • Page 21 LOCKING THE SLIDES STEADY & FOLLOWER RESTS When face-cutting large diameter surfaces, for exam- The hinge-type steady rest, see also Figure -9, can be ple, it is often desirable to lock the carriage. Less fre- mounted anywhere along the lathe bed. It makes pos- quently it can be helpful to lock, or at least stiffen, the sible cutting operations on long, slender workpieces be- sliding motion of the cross slide or compound, Figures...
  • Page 22 for corrosion and other undesirable effects on the lathe and the coolant pump. If you use water-miscible cutting fluid, bear in mind that the ratio of product to water is important — too much water causes excessive corrosion and other problems. Check the mix from time to time using a refractometer.
  • Page 23 Section 4 SERVICING THE LATHE Disconnect 220V power before any maintenance operation! Remove all machining debris and foreign objects before lubricating ANYTHING! If need be, any oil is better than no oil – but use the recommended lubricants when you can. GENERAL Recommended lubricants Aside from abrasive particles and machining debris,...
  • Page 24 CARRIAGE FEED GEARBOX DRAIN & REFILL Make a card-stock Vee channel as described for draining the headstock. Run the lathe for a few minutes to warm the oil if necessary, then remove fill plug (2), Figure 4-2. With the Vee channel in place, remove drain plug (3) and allow the gearbox to empty completely.
  • Page 25 BALL OILERS GIB ADJUSTMENT Use a pump-type oil can, preferably with a flexible spout Gibs on the cross slide and compound are gently-ta- tipped with a soft tube. The ID of the tip should be large pered lengths of ground cast iron held fast by opposing enough to seat on the oiler's brass flange, more than screws at each end (Figures 4-0 and 4- show only spanning the spring-loaded steel ball.
  • Page 26 outer (lock) nut. Adjust the innner nut to take up the end- of the lathe. It comprises a support bar, attached to the carriage, and two separate gib strips each with two ad- float, then re-tighten the lock nut. justing screws. Split nut adjustment If the split nut becomes excessively loose, with appre- ciable side to side movement, this may be corrected...
  • Page 27 ALIGNING THE LATHE Quick method This method works only if the centers are in new condi- The most important attribute of a properly set up lathe tion, sharp and clean. is its ability to “machine parallel”, to cut a cylinder of uni- Carefully clean the taper sockets and the tapers form diameter over its entire length.
  • Page 28 Figure C Drill rod between centers Starting at location (), note which way the pointer rotates when the cross slide is moved inward. In this setup the pointer is assumed to turn clockwise as the cross slide moves in. Pre-load the indicator by a few thousandths, then traverse the carriage from end to end.
  • Page 29 Method 2 (continued) Install the drill rod in a collet or independent 4-jaw chuck with about 5 inches protrud- ing. Center drilling is not needed. Adjust the chuck for minimum runout at position (). Check the runout at (2). Pointer movement when traversing is not a concern at this stage.
  • Page 30 PM-1236 HEADSTOCK ALIGNMENT Figure A is an exaggerated view of what happens if the spindle is not precisely aligned with the lathe bed. This is correctable by slightly loosening the attachment screws, Figures A2 and A3, then adjusting the screws set into a tab rail below the headstock, Figure A4.
  • Page 31 Section 5 PARTS Mdel PM-1236 Electrical schematic PM-236 v4 -207.indd...
  • Page 32 HEADSTOCK PM-236 v4 -207.indd...
  • Page 33 HEADSTOCK NOTE Ref. Mfr. No. Description Qty. Ref. Mfr. No. Description Qty. Dimensions are in mil- 2034 Spindle: D1-4 camlock, MT5 Key: 5 x 20 limeters. 2035 Lock pin 63 2063 Plug All gears: pressure Spring: 0.6 × 4 × 22 Circlip angle 20 degrees, module M2 (except...

  • Page 34: Change Gears

    HEADSTOCK (continued) 49 2026 Gear: pair 40/45T Screw: M12 x 25 skt hd 50 25 Circlip Screw: M3 x 6 skt hd Ball bearing: 25 x 47 x 12 112 2060 Pointer disk 52 2027A Shaft (output) Screw: M6 x 20 set 53 42 Circlip 114 2061...
  • Page 35 CARRIAGE FEED GEARBOX Input (from ex- ternal gear train) Leadscrew drive Carriage feed PM-236 v4 -207.indd...
  • Page 36 CARRIAGE FEED GEARBOX NOTE Ref. Mfr. No. Description Qty. Ref. Mfr. No. Description Qty. Dimensions are in mil- Oiler 51 3060E Front panel limeters. Screw: M6 x 12 skt hd 52 3071D Oil seal All gears: pressure angle 3034B Input shaft (1) flange 53 3059D Faceplate 20 degrees, module...
  • Page 37 STAND & COOLANT COMPONENTS Ref. Mfr. No. Description Qty. Ref. Mfr. No. Description Qty. 1023 Back plate 23 1041 Linkage Circlip Washer Spindle brake Clip: 2.5 x 16 1040 Shaft 26 8400 Stand cabinet, left hand Screw: M6 x 16 skt hd 27 1044 Draw bar Coolant flex pipe...
  • Page 38 STAND & COOLANT COMPONENTS (continued) Ref. Mfr. No. Description Qty. Ref. Mfr. No. Description Qty. 54 1048 Spring, extension Roll pin: 5 x 40 55 1047 Spring anchor 62 1049-1 Shaft Collar: 20 ID Screw: M6 x 12 skt hd 57 1045 Crank 64 1049-3...
  • Page 39 TAILSTOCK Ref. Mfr. No. Description Ref. Mfr. No. Description 4033 Shoulder bolt 17 6012 Nut: M10 4032 18 6013 Tailstock quill Nut: M10 19 6001 Tailstock body Washer 20 6022 Clamp screw 6005 Handwheel 21 6021 Lever 4037 Leaf spring 22 6017 Clamp screw 6010...
  • Page 40 COMPOUND REST Ref. Mfr. No. Description Qty. Ref. Mfr. No. Description Qty. 5010 Clamp lever 19 5023 Compound rest gib 5009 Clamp boss, M16 20 5021 Gib screw 5008 Collar 21 5012A1 Leadscrew barrel nut Screw: sq hd, M10 x 45 22 5011A3 Compound rest leadscrew 5005 4-way toolholder...
  • Page 41 LATHE BED Lathe bed 10047 NOT SHOWN Removable gap NOTE Racks are attached by M6 x 15 skt hd screws (6) and 5 x 20 pins (6). Bed is attached to stands by M12 x 40 hex hd bolts (6) plug and related hardware CARRIAGE (diagram on following page)
  • Page 42 CARRIAGE (continued) PM-236 v4 -207.indd...
  • Page 43 FOLLOWER & STEADY RESTS STEADY REST FOLLOWER REST Qty. Ref. Mfr. No. Description Qty. Ref. Mfr. No. Description Screw: set, M6 x 6 B5 8208 Sleeve A2 8205 Knob B6 8209 Nose A3 8207 Bushing B7 8202 Upper frame A4 8206 Pressure screw Screw: set, M6 x 10 A5 8208...
  • Page 44 APRON Worm rides on feed shaft, not shown, drives gear #45 Splines on #39 engage with grooves on #24 #52, #57 and related components prevent accidental closing of the half nuts #70 when cross slide feed or carriage feed is engaged by lever #39 Not shown Oil sight glass Ref.
  • Page 45 APRON (continued) Ref. Mfr. No. Description Qty. Qty. Ref. Mfr. Description 57 4021 Stop flag 67 3022 Gib, split-nut casing Screw: set M5 x 12 Screw: skt hd M5 59 4023 Split-nut shaft Split-nut assembly Screw: skt hd M8 x 30 Set screw Washer Screw: skt hd M10 x 20...

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