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Model PM-835S
Knee-type milling machine
Table size 8 x 35 in.
3 HP 220 Vac single-phase motor
Full-featured milling head with powered quill feed
Headstock tilt ± 90
left-right, plus fore-aft tilt for tramming
o
Precision spindle in chrome plated and ground quill
Hardened and ground sliding surfaces and dovetails
The head on this machine is manufactured in Taiwan
PM-835S 10-3-2018 v2.indd
1
Copyright © 2018 Quality Machine Tools, LLC
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Summary of Contents for Precision matthews PM-835S
- Page 1 Precision spindle in chrome plated and ground quill Hardened and ground sliding surfaces and dovetails The head on this machine is manufactured in Taiwan PM-835S 10-3-2018 v2.indd Copyright © 2018 Quality Machine Tools, LLC...
- Page 2 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 manual to be advisory only. Precision Matthews cannot be held liable for injury or property damage during installation or use, or from negligence, improper training, machine modifications or misuse.
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Page 3: Section 1 Features & Specifications
Ram travel Quill travel Quill diameter 3.375 Left/right head tilt ±90º T-slot dimensions PM-835S T-slots are 14 mm = 0.551 in. Forward/backward head tilt ±5º wide, compatible with 1/2 in. diameter Approximate net weight (lb) 1550 threaded studs, T-bolts, etc. -
Page 4: Summary Of Features
Quill auto feed lever 10. Quill auto feed direction plunger 11. Quill fine feed handwheel 12. Quill auto feed rate selector 13. Motor switch 14. Motor pivot 15. Spindle brake Copyright © 2020 Quality Machine Tools, LLC PM-835S v3 2020-10... -
Page 5: Section 2 Installation
(X) and crosswise (Y), shimming as necessary un- der the base, or adjusting the leveling screws. Figure 2-1 Head mounting bolts The numbers indicate the correct (diagonal) tightening sequence. PM-835S v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC... - Page 6 Three-phase motors can be reversed by phase swapping. • Some users prefer the FWD rotation to be clockwise when the back gear selector is set to LO. This calls for re-wiring if the motor is single-phase. Copyright © 2020 Quality Machine Tools, LLC PM-835S v3 2020-10...
- Page 7 • 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-835S v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC...
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Page 8: Section 3 Using The Mill
TILTING THE HEAD Figure 3-1 Example leadscrew handle & micrometer dial The PM-835S mill has a two-way adjustable head. It can be The micrometer dial is resettable. It is locked to the leadscrew by a swiveled ±90º clockwise/counter-clockwise, also tilted ±5º... -
Page 9: Spindle Speed
FWD, it will turn counter-clockwise in the low the clamp screws on both sides, white arrows, then adjust using a hex range. For clockwise rotation in the low range, set the motor key, black arrow. PM-835S v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC... -
Page 10: Changing Spindle Speed
Until that happens don’t apply power! Move the SPEED RANGE lever to the HIGH detent posi- tion. (HIGH = back gear OUT) Figure 3-10 Spindle brake Run the spindle. Rotation OK? Switch FWD/REV if not. Copyright © 2020 Quality Machine Tools, LLC PM-835S v3 2020-10... - Page 11 3/8” in mild steel). Figure 3-12 Quill manual feed handle and index plate Be sure the quill is unlocked before auto feeding PM-835S v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC...
- Page 12 Fine feed handwheel Overload clutch trip lever Quill auto feed lever Figure 3-14 Quill feed components Auto feed ON Auto feed OFF Figure 3-15 Activating the quill auto feed Copyright © 2020 Quality Machine Tools, LLC PM-835S v3 2020-10...
- Page 13 They will not normally need attention. If you are consider- ing any adjustments, please contact Precision Matthews for guidance. PM-835S v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC...
- Page 14 For more demanding project work thereafter, the Remove the vise and clean the table surface. spindle needs to be precisely set at 90 degrees to the table in Copyright © 2020 Quality Machine Tools, LLC PM-835S v3 2020-10...
- Page 15 Many precision vises have 14 mm slots. This is an exact match INSTALLING & INDICATING A VISE for the PM-835S T-slots, in which case the keys will have par- For routine milling operations the workpiece is usually held in allel sides as in Figure 3-21 (wider slots in the vise will call for a precision vise.
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Page 16: Section 4 Maintenance
ISO68 oil, Vactra No. 2 or equivalent. Apply by brush. Quill: A few drops of ISO 32 (10W oil) in the oil cup, Figure 4-4. Figure 4-5 Ram dovetails Copyright © 2020 Quality Machine Tools, LLC PM-835S v3 2020-10... -
Page 17: Gib Adjustment
Figure 4-10. (Some pressure should be felt when the Figure 4-6 Back gear grease nipple second screw is loosened; if not, the spring may be broken, or detached from the shaft — call Precision Matthews for guid- COLLET LOCATING SCREW ance.) R8 devices are located in the spindle by a special set screw that protrudes less than 3/32"... - Page 18 Figure 4-17 Table (X axis) backlash adjuster Figure 4-14 Saddle gib (Y axis), rear Figure 4-18 Saddle (Y axis) backlash adjuster Figure 4-15 Knee gib (Z axis), topside Figure 4-16 Knee gib (Z axis), underside Copyright © 2020 Quality Machine Tools, LLC PM-835S v3 2020-10...
- Page 19 Off-the-shelf hardware may not be shown in all instances (some locations call for US threads, some Metric). To order replacement parts from Precision Matthews, give the Model number, Serial number, and reference number on this drawing. PM-835S v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC...
- Page 20 Cluster gear cover plate Z7174 Tabbed washer Z7212 Quill housing Z7250 Standard off-the-shelf hardware is omitted from this list. Items listed are unique fabricated or critical parts specific to the PM-835S mill. Copyright © 2020 Quality Machine Tools, LLC PM-835S v3 2020-10...
- Page 21 QUILL AUTO FEED POWER TAKE-OFF SCHEMATIC Fig 2 This drawing shows major components of the drive train, in principle only. It is not to scale. The numbers here refer to Milling head assembly.jpg, previous pages. PM-835S v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC...
- Page 22 (some locations call for US threads, some Metric). To order replace- ment parts from Precision Matthews, give the Model number, Serial number, and reference number on this drawing. Copyright © 2020 Quality Machine Tools, LLC...
- Page 23 Bushing Z7301 Bull gear Z7284 81-84 Shit Lever Assembly Z7040 DRIVE SYSTEM SCHEMATIC Fig 4 NOTE: The bull gear is fixed; the countershaft gear is moved up/down to engage/disengage it. PM-835S v3 2020-10 Copyright © 2020 Quality Machine Tools, LLC...
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