Powermatic 1791291K User Manual

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Operating Instructions and Parts Manual

Combination Belt/Disc Sander

Model 31A

WMH TOOL GROUP, Inc.

Warranty and Service

WMH Tool Group, Inc., warrants every product it sells. If one of our tools needs service or repair, one of our Authorized Service Centers located throughout the United States can give you quick service. In most cases, any of these WMH Tool Group Authorized Service Centers can authorize warranty repair, assist you in obtaining parts, or perform routine maintenance and major repair on your POWERMATIC

MORE INFORMATION

WMH Tool Group is consistently adding new products to the line. For complete, up-to-date product information, check with your local WMH Tool Group distributor, or visit powermatic.com.

WARRANTY

POWERMATIC products carry a limited warranty which varies in duration based upon the product.

WHAT IS COVERED?

This warranty covers any defects in workmanship or materials subject to the exceptions stated below. Cutting tools, abrasives and other consumables are excluded from warranty coverage.

WHO IS COVERED?

This warranty covers only the initial purchaser of the product.

WHAT IS THE PERIOD OF COVERAGE?

The general POWERMATIC warranty lasts for the time period specified in the product literature of each product.

WHAT IS NOT COVERED?

The Five Year Warranty does not cover products used for commercial, industrial or educational purposes. Products with a Five Year Warranty that are used for commercial, industrial or education purposes revert to a One Year Warranty. This warranty does not cover defects due directly or indirectly to misuse, abuse, negligence or accidents, normal wear-and-tear, improper repair or alterations, or lack of maintenance.

HOW TO GET SERVICE

The product or part must be returned for examination, postage prepaid, to a location designated by us. For the name of the location nearest you, please call 1-800-274-6848.

You must provide proof of initial purchase date and an explanation of the complaint must accompany the merchandise. If our inspection discloses a defect, we will repair or replace the product, or refund the purchase price, at our option.

We will return the repaired product or replacement at our expense unless it is determined by us that there is no defect, or that the defect resulted from causes not within the scope of our warranty in which case we will, at your direction, dispose of or return the product. In the event you choose to have the product returned, you will be responsible for the handling and shipping costs of the return.

HOW STATE LAW APPLIES

This warranty gives you specific legal rights; you may also have other rights which vary from state to state.

LIMITATIONS ON THIS WARRANTY

WMH TOOL GROUP LIMITS ALL IMPLIED WARRANTIES TO THE PERIOD OF THE LIMITED WARRANTY FOR EACH PRODUCT. EXCEPT AS STATED HEREIN, ANY IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS ARE EXCLUDED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG THE IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU.

WMH TOOL GROUP SHALL IN NO EVENT BE LIABLE FOR DEATH, INJURIES TO PERSONS OR PROPERTY, OR FOR INCIDENTAL, CONTINGENT, SPECIAL, OR CONSEQUENTIAL DAMAGES ARISING FROM THE USE OF OUR PRODUCTS. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY TO YOU.

WMH Tool Group sells through distributors only. The specifications in WMH catalogs are given as general information and are not binding. Members of WMH Tool Group reserve the right to effect at any time, without prior notice, those alterations to parts, fittings, and accessory equipment which they may deem necessary for any reason whatsoever.

tools. For the name of an Authorized Service Center in your area call 1-800-274-6848.

Warranty and Service .............................................................................................................................. 2

Table of Contents.................................................................................................................................... 3

Warning...................................................................................................................................................4

Introduction ............................................................................................................................................. 6

Specifications..........................................................................................................................................6

Dimensions ............................................................................................................................................. 7

Unpacking ............................................................................................................................................... 8

Contents of the Shipping Container......................................................................................................8

Assembly ................................................................................................................................................ 9

Installing Sander on Stand ................................................................................................................... 9

Installing and Tracking Abrasive Belt .................................................................................................. 10

Installing Fence.................................................................................................................................. 10

Installing Abrasive Disc...................................................................................................................... 11

Installing Table...................................................................................................................................11

Dust Outlet and Cord Plate................................................................................................................. 12

Switch (Single Phase Model).............................................................................................................. 12

Electrical Connections ........................................................................................................................... 12

Adjustments .......................................................................................................................................... 14

Platen Adjustment.............................................................................................................................. 14

Sanding Table Adjustment ................................................................................................................. 14

Work Stop.......................................................................................................................................... 15

Belt Arm Positioning...........................................................................................................................15

Operation.............................................................................................................................................. 16

Template Forms.................................................................................................................................16

Fence/Table....................................................................................................................................... 16

Types of Operations........................................................................................................................... 17

Maintenance.......................................................................................................................................... 18

Lubrication ......................................................................................................................................... 18

Extension Cords.................................................................................................................................13

Guide to Sanding Belts and Discs.......................................................................................................... 19

Troubleshooting..................................................................................................................................... 20

Replacement Parts................................................................................................................................ 20

Parts List: 31A Sander Body Assembly ..............................................................................................21

31A Sander Body Assembly............................................................................................................... 23

Parts List: 31A Stand Assembly (1PH) ...............................................................................................24

31A Stand Assembly (1PH)................................................................................................................ 25

Parts List: 31A Stand Assembly (3PH) ...............................................................................................26

31A Stand Assembly (3PH)................................................................................................................ 27

Electrical Connections (1 Phase) ........................................................................................................... 28

Electrical Connections (3 Phase) ........................................................................................................... 29

Warning

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. Make certain that the machine frame is electrically grounded and that a ground lead is included in the incoming electrical service. In cases where a cord and plug are used, make certain that the grounding plug connects to a suitable ground. Follow the grounding procedure indicated in the National Electrical Code.

Eye safety. Wear an approved safety shield, goggles, or glasses to protect eyes. (NOTE: Common eyeglasses are only impact-resistant, they are not safety glasses.)

Personal protection. Before operating the machine, remove tie, rings, watch and other jewelry and roll up sleeves above the elbows. Remove all loose outer clothing and confine long hair. Protective type footwear should be used. Where the noise exceeds the level of exposure allowed in Section 1910.95 of the OSHA Regulations, use hearing protective devices. Do not wear gloves.

Guards. Keep the machine guards in place at all times when the machine is in use. If removed for maintenance purposes, use extreme caution and replace guards on completion of the maintenance task before operating the sander. DO NOT operate the machine with the guards off except for the belt end guard which swings away to allow for contour sanding. Keep that guard in place except when contour sanding and swing it back into position immediately after completing the contour sanding task.

Work area. Keep the floor around the machine clean and free of scrap material, saw dust, oil and other liquids to minimize the danger of tripping or slipping. Make certain the work area is well lighted and that a proper exhaust system is used to minimize dust. Powermatic recommends the use of anti-skid floor strips on the floor area where the operator normally stands and that each machine’s work area be marked off. Provide adequate work space around the machine.

Avoid accidental starting: Make certain motor switch is in off position before connecting power to the machine.

Operator position. Maintain a balanced stance and keep your body under control at all times. Do not over-reach. Do not stand in line with the belt in the direction that it is moving when the work stop is not in use.

Belt and Disc Direction. Proper belt direction is from the idler pulley towards the drive pulley. Proper disc rotation is counterclockwise facing the disc. CAUTION: Sand on the section of the disc from the center to the left edge. DO NOT use the right hand portion for sanding.

Housekeeping. Before turning on machine, remove all extra equipment such as keys, wrenches, scrap, and cleaning rags away from the machine.

Careless acts. Give the work you are doing your undivided attention. Looking around, carrying on a conversation, and “horseplay” are careless acts that can result in serious injury.

Disconnect machine before performing any service or maintenance.

Hand safety. Keep fingers and hands away from the belt or disc. DO NOT clear sawdust from the table

with the hands; use a brush. On small or thin parts, use a push stick or jig to keep the hands from contacting the abrasive. If using the fence, avoid getting fingers too close to the fence to prevent pinching. Never wear gloves while operating the sander.

Machine capacity. Do not try to force the sander to remove material faster than the power available from the drive motor. The use of light pressure on either disc or belt sanding and moving the part back and forth will maximize belt or disc life, help to minimize the chances of an accident and keep the force within the capacity of the drive motor.

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. If the operator leaves the machine area for any reason, the sander should be turned "off" and the abrasive belt and disc should come to a complete stop before his/her departure. In addition, if the operation is complete, he should clean the sander and the work area. Never clean the sander with power "on" and never use the hands to clear sawdust and debris; use a brush.

Replacement parts. Use only Powermatic or factory authorized replacement parts and accessories; otherwise the warranty and guarantee is null and void.

Misuse. Do not use this Powermatic sander for other than its intended use. If used for other purposes, Powermatic disclaims any real or implied warranty and holds itself harmless for any injury or damage which may result from that use.

If you are not thoroughly familiar with the operation of sanders, obtain advice from your supervisor, instructor or other qualified person.

Drugs, alcohol, medication. Do not operate this machine while under the influence of drugs, alcohol, or any medication.

Health hazards. Some dust created by power sanding, sawing, grinding, drilling and other construction activities contains chemicals known to cause cancer, birth defects or other reproductive harm. Some examples of these chemicals are:

* Lead from lead-based paint. * Crystalline silica from bricks and cement and other masonry products.

* Arsenic and chromium from chemically-treated lumber. Your risk from these exposures varies, depending on how often you do this type of work. To reduce your exposure to these chemicals, work in a well-ventilated area, and work with approved safety equipment, such as those dust masks that are specifically designed to filter out microscopic particles.

Familiarize yourself with the following safety notices used in this manual:

This means that if precautions are not heeded, it may result in minor injury and/or

possible machine damage.

This means that if precautions are not heeded, it may result in serious or possibly even

fatal injury.

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Introduction

This manual is provided by WMH Tool Group, Inc. covering the safe operation and maintenance procedures for a Powermatic Model 31A Combination Belt/Disc Sander. This manual contains instructions on installation, safety precautions, general operating procedures, maintenance instructions and parts breakdown. This machine has been designed and constructed to provide years of trouble free operation if used in accordance with instructions set forth in this manual. If there are any questions or comments, please contact either your local supplier or WMH Tool Group. WMH Tool Group can also be reached at our web site: www.wmhtoolgroup.com.

Specifications

Model Number.............................................................................31A ................................................. 31A

Stock Number (1 Phase model)......................................... 1791291K .......................................................

Stock Number (3 Phase model)......................................................... ....................................... 1791292K

Abrasive Belt Size (in.) ............................................................ 6 x 48 ..............................................6 x 48

Disc Size (in.)................................................................................12 ................................................... 12

Table Working Height (in.)......................................... 34 disc, 36 belt ................................34 disc, 36 belt

Sanding Arm Locking Positions (deg.) ........................... 0, 45 and 90 ....................................0, 45 and 90

Disc Table Size (in.) .......................................................... 17-1/4 x 9 ........................................17-1/4 x 9

Disc Table Tilt (deg.).................................................. 15 up, 45 down ............................... 15 up, 45 down

Belt Table Size (in.)..................................................... 13-1/4 x 7-1/2 ..................................13-1/4 x 7-1/2

Belt Table Tilt (deg.) .............................................................45 down .......................................... 45 down

Disc Speed (RPM)..................................................................... 2375 ............................................... 2375

Belt Speed (SFPM).................................................................... 2410 ............................................... 2410

Dust Port Diameter (in.)...................................................................4 ..................................................... 4

Dust Collection Minimum CFM Required...................................... 400 ................................................. 400

Motor...........................................................1-1/2HP, 1PH, 115/230V .......................2HP, 3PH, 230/460V

(pre-wired 115V), 14/7A (pre-wired 230V) 7/3.5A

Overall Dimensions (LxWxH)(in.)........................ 24 x 31-1/4 x 54-1/2 ........................ 24 x 31-1/4 x 54-1/2

Net Weight (lbs.)..........................................................................247 ................................................. 247

Shipping Weight (lbs.)..................................................................275 ................................................. 275

The above specifications were current at the time this manual was published, but because of our policy of continuous improvement, WMH Tool Group reserves the right to change specifications at any time and without prior notice, without incurring obligations.

Read and understand the entire contents of this manual before attempting set-up

or operation! Failure to comply may cause serious injury.

Dimensions

Figure 1

Unpacking

Open shipping container and check for shipping damage. Report any damage immediately to your distributor and shipping agent. Do not discard any shipping material until the Sander is assembled and running properly.

Compare the contents of your container with the following parts list to make sure all parts are intact. Missing parts, if any, should be reported to your distributor. Read the instruction manual thoroughly for assembly, maintenance and safety instructions.

Contents of the Shipping Container

Container #1 (Sander):

1 Belt/Disc Sander 1 Abrasive Belt, 6” x 48”, 60 grit 1 Abrasive Disc, 12” dia., 60 grit 1 Disc Table Assembly 1 Fence Assembly

1 Miter Gauge Assembly 1 Bag of Fasteners, contains: 2 Socket Head Cap Screws, M10x25 – AA

4 Hex Head Screws, M8 x 25 – BB 4 Lock Washers, M8 – CC 4 Flat Washers, M8 – DD 2 Flat Washers, M10 – EE 1 Owner's Manual (not shown) 1 Warranty Card (not shown)

Container #2 (Stand):

1 Stand with motor 1 Dust Outlet 1 Bag of Fasteners, contains: 4 Pan Hd. Flanged Screws, M6 x 12 – FF 2 Pan Head Screws, M5 x 12 – GG 2 Pan Head Screws, M4 x 8 – HH 2 Lock Washers, M4 – JJ 2 Flat Washers, M4 – KK

Figure 2

Assembly

Tools required:

wrenches – 10, 13 and 17mm hex (Allen) wrench – 8mm Cross-point screwdriver

Installing Sander on Stand

Refer to Figure 3:

1. If the machine is to be secured to the floor, use high quality lag screws through the four holes inside the bottom of the stand. If using a mobile base, be sure to lock the wheels before assembling, operating or making adjustments to the sander. (A mobile base for your sander – part no. 708118 – is available from WMH Tool Group.)

2. The sander is shipped with the belt arm in horizontal position. Pull out on the index pin and raise the arm to vertical position, as shown in Figure 3. This will better balance the sander as you place it on the stand. Allow the index pin to pop back in to ensure the belt arm is secure.

Figure 3

3. Position the sander on the stand making sure to orient it properly, as shown. Also, make sure the loose end of the drive belt below the disc is pulled down and guided through the rectangular hole in the stand.

4. Secure the sander to the stand with four M8 x 25 hex head screws (BB), four M8 lock washers (CC) and four M8 flat washers (DD). NOTE: Hand tighten the screws only until all four are inserted; then tighten them completely with a 13mm wrench.

Refer to Figure 4:

5. The drive belt is already mounted on the disc pulley behind the disc, as shown in

Figure 4. However, it should be checked to ensure that it is in the pulley groove.

6. Loosen the top hex nut on the tensioning screw with a 17mm wrench, and rotate the lower hex nut to raise the motor platform high enough to position the drive belt around the motor pulley.

7. When the belt is in the motor pulley groove, tension the belt by rotating the lower hex nut downward out of the way, and tightening the top hex nut to lower the platform. When the belt is tensioned properly, tighten the lower hex nut against the platform to secure the setting.

Figure 4

(viewed from front of machine)

NOTE: Proper tension is achieved when there is moderate deflection (about 1/2”) in the belt midway between the two pulleys. After a period of use, re-check the belt tension, as new belts have a tendency to stretch slightly during the breaking-in process.

Installing and Tracking Abrasive Belt

To install the abrasive belt, proceed as follows Refer to Figures 5 and 6:

1. Loosen the knob (A) and swing the belt end guard (B) out of position.

2. Remove the side cover by unscrewing the two knobs holding it, and sliding the tabs of the side cover out of the slots of the sander.

3. Loosen the tension knob (C). This will lower the top drum, providing slack for installing the abrasive belt.

4. Slide the abrasive belt onto the drums until it is centered on them.

5. Tighten the tension knob (C).

IMPORTANT: Do not over tension, as this can cause the abrasive belt to stretch and weaken.

The abrasive belt must be properly tracked before operating. (Tracking refers to the position of the abrasive belt on the drums while they are in motion.) Proceed as follows:

6. Check tracking manually at first, by moving the belt downward with your hand while the machine is off. The abrasive belt should remain at the center of the drums.

Figure 5

7. If the belt veers to one side or the other, loosen the locking wheel (D) and rotate the tracking knob (E) either left or right until the belt centers itself. When manual tracking appears successful, turn the machine on for a moment and confirm that the abrasive belt will remain centered during operation. If needed, continue fine-tuning the adjustment with the tracking screw (E). It may require a combination of tension knob (C) and tracking knob (E) adjustment to achieve a proper setting.

8. When satisfied, tighten the locking wheel (D) against the belt arm to secure the setting.

9. Re-install side cover and secure with the knobs. Swing the end guard (B) back into position and re-tighten the knob (A).

Installing Fence

Refer to Figure 7:

Pinch Point. Before installing

the fence, adjust it to a right angle position as shown, and tighten the knob to secure.

Figure 6

1. Tilt the belt arm into horizontal position, and place the fence against the platen in the position shown.

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