BELT & DISC SANDER Model 31A Instruction Manual & Parts List M-0460267 (800) 274-6848 www.powermatic.
This manual has been prepared for the owner and operators of a Powermatic Model 31A Belt & Disc Sander. Its purpose, aside from machine operation, is to promote safety through the use of accepted correct operating and maintenance procedures. Completely read the safety and maintenance instructions before operating or servicing the machine. To obtain maximum life and efficiency from your sander, and to aid in using the machine safely, read this manual thoroughly and follow all instructions carefully.
TABLE OF CONTENTS Safety Rules ............................................................................................................................................................... 4-5 Safety Decal .................................................................................................................................................................. 6 Specifications ............................................................................................................................
! SAFETY RULES As with all machines, there is a certain amount of hazard involved with the use of this sander. Use the machine with the respect and caution demanded where safety precautions are concerned. When normal safety precautions are overlooked or ignored, personal injury to the operator can result. Read, understand and follow the safety and operating instructions found in this manual. Know the limitations and hazards associated with this machine. Electrical grounding.
Machine adjustments. Make all machine adjustments with power off except belt tracking. Belt tracking should be checked manually before starting the sander, but final adjustment may have to be made after starting up the sander. Table safety. Be sure the table is locked in position before placing stock on it and that its front edge is within 1/16” or less, of the disc or belt. Job completion.
! SAFETY: Decal for Model 31A Sander Familiarize yourself with the location and content of this decal on your machine.
SPECIFICATIONS: Model 31A Sander FIGURE 1 Disc size ..........................................................................................................................................................................12” Disc speed........................................................................................................................................................... 2378 RPM Sanding belt size ...........................................................................................
RECEIVING Remove the sander and base and any loose parts from their containers. Check for damage and ensure all parts are intact. Any damage should be reported to your distributor and shipping agent immediately upon discovery. Before proceeding with assembly, read the manual thoroughly; familiarize yourself with correct assembly and maintenance procedures and proper safety precautions.
WARNING: Electrical wiring should be done by a qualified electrician. The machine must be properly grounded to help avoid electrical shock and associated hazards including possible death. ! ADJUSTMENTS Before putting power to the sander, inspect the machine thoroughly. Check to ensure that all screws are tight, all mechanical functions work freely, belt runs freely and tracks properly, and the disc runs freely and does not come into contact with the guard or table.
3. Make final adjustments to the tracking by momentarily starting and stopping the motor while at the same time adjusting the tracking screw (F), Figure 5, at the side of the belt arm. To lock the screw in place, rotate the tracking screw locking nut (G) against the belt arm. PLATEN ADJUSTMENT Due to wear, occasionally the platen may have to be readjusted. To do this, proceed as follows: Swing the end guard out of position and remove the side guard.
positions of the arm). Use a 10mm hex wrench to remove or install the work stop. BELT ARM POSITIONING Your sander is equipped with a shot pin arrangement to lock the belt arm in 0-degree, 45-degree, and 90 degree positions. To position the belt, loosen the locking handle (A) shown in Figure 10. Pull out on the shot pin (B), shown in Figure 11, and swing the belt arm into the desired position. Then release the shot pin. Check that the pin has gone into position by attempting to move belt arm back and forth.
FENCE/TABLE The fence attachment is used with the belt sander and can be positioned alternately as a table (with the belt arm in upright position) or as a fence (with the belt arm in horizontal position). The fence attachment surface has a slot for a mitre gauge when the attachment is used as a table. The fence attachment can be tilted between 90degree and 45-degree angles by loosening the knob (A) on the center portion of the attachment.
TYPES OF OPERATIONS Flat surface sanding is demonstrated in Figure 16, where the major surface is sanded in a flat plane. Edge sanding is a common type of long surface sanding that can be done using the fence. See Figure 17. Edge sanding and flat surface sanding can also be done with the belt in a vertical position, by using the fence assembly as a table. Miters and compound miter cuts can be sanded using the table and the optional miter gauge (available from your Powermatic dealer).
GRIT COMPARISON CHART Accessories SANDING BELTS SANDING DISCS 57617110 57617210 57617410 57617510 57617610 57617710 57512210 57512310 6” x 48” Sanding Belt, 24 Grit, Closed Coat* 6” x 48” Sanding Belt, 40 Grit, Closed Coat 6” x 48” Sanding Belt, 60 Grit, Closed Coat 6” x 48” Sanding Belt, 80 Grit, Closed Coat 6” x 48” Sanding Belt, 100 Grit, Closed Coat 6” x 48” Sanding Belt, 120 Grit, Closed Coat 6” x 48” Sanding Belt, 150 Grit, Closed Coat 6” x 48” Sanding Belt, 180 Grit, Closed Coat 57698525 5769865
TROUBLE SHOOTING for Model 31A Sander Problem Cause Solution Machine fails to start. 1. Faulty switch. 2. Bad motor. 3. Not connected to power source. 4. Connected to wrong voltage. 1. Replace switch. 2. Replace motor. 3. Check connection. 4. Reconnect to correct voltage. Belt won’t track. 1. Platen shifted or worn. 1. Raise platen to1/32” beyond the apex of the drum. 2. Replace drum. 3. Replace belt. 2. Drum is worn. 3. Belt is streched unevenly. Abrasive disc comes free of aluminum discs. 1.
PARTS LIST: Body Assembly (Model 31A Sander) No. Part No.
No. Part No. Description Quantity 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 31A-51 31A-52 31A-53 31A-54 31A-55 TS-1504041 TS-1551051 31A-56 31A-57 31A-58 31A-59 31A-60 TS-1550071 TS-1505031 31A-61 31A-62 31A-63 31A-64 31A-65 31A-68 31A-69 31A-70 31A-71 31A-72 31A-73 31A-74 TS-1550041 TS-1550071 TS-1540041 TS-1523071 TS-1550031 TS-1503051 TS-1524051 31A-75 TS-1540041 31A-76 31A-77 Set Screw, M6 x 8.....................................
Body Assembly (Model 31A Sander) 18
PARTS LIST: Stand Assembly (Model 31A Sander) No. Part No. Description 1 2 3 4 31A-78 31A-79 31A-80 31A-81 31A-103 31A-82 31A-83 31A-84 31A-85 31A-86 TS-1533042 31A-87 TS-1540031 31A-88 31A-89 TS-1550021 TS-1551021 31A-90 31A-91 31A-92 31A-93 31A-94 31A-104 TS-1551061 31A-95 TS-1551061 TS-1550061 TS-1540061 31A-97 31A-105 31A-98 31A-106 31A-99 31A-21 TS-1523041 31A-100 31A-101 31A-99 TS-1550071 31A-102 Stand................................................................................................
Stand Assembly (Model 31A Sander) 20
ELECTRICAL SCHEMATIC (Model 31A Sander) 21
ELECTRICAL SCHEMATIC (Model 31A Sander) 22
ELECTRICAL SCHEMATIC (Model 31A Sander) 23
ELECTRICAL SCHEMATIC (Model 31A Sander) 24
To order parts or reach our service department, please call our toll-free number between 8:00 a.m. and 4:30 p.m. (CST), Monday through Friday. Having the Model Number and Serial Number of your machine available when you call will allow us to serve you quickly and accurately. Locating the stock number of the part(s) required from your parts manual will also expedite your order. Phone No.: (800) 274-6848 Fax No.
07/02 WMH Tool Group P.O. Box 1349 Auburn, WA 98071-1349 Phone:(800) 274-6848 Fax: (800) 274-6840 E-mail: powermatic@wmhtoolgroup.com Website: www.powermatic.
