(Model 31-300) PART NO. 913131 - 04-12-05 Copyright © 2005 Delta Machinery To learn more about DELTA MACHINERY visit our website at: www.deltamachinery.com. For Parts, Service, Warranty or other Assistance, please call 1-800-223-7278 (In Canada call 1-800-463-3582).
TABLE OF CONTENTS IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 SAFETY GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 GENERAL SAFETY RULES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SAFETY GUIDELINES - DEFINITIONS It is important for you to read and understand this manual. The information it contains relates to protecting YOUR SAFETY and PREVENTING PROBLEMS. The symbols below are used to help you recognize this information. Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
GENERAL SAFETY RULES READ AND UNDERSTAND ALL WARNINGS AND OPERATING INSTRUCTIONS BEFORE USING THIS EQUIPMENT. Failure to follow all instructions listed below, may result in electric shock, fire, and/or serious personal injury or property damage. IMPORTANT SAFETY INSTRUCTIONS 1. FOR YOUR OWN SAFETY, READ THE INSTRUCTION MANUAL BEFORE OPERATING THE MACHINE. Learning the machine’s application, limitations, and specific hazards will greatly minimize the possibility of accidents and injury. 14. 2.
ADDITIONAL SPECIFIC SAFETY RULES FAILURE TO FOLLOW THESE RULES MAY RESULT IN SERIOUS PERSONAL INJURY. 12. MAINTAIN A MAXIMUM CLEARANCE OF 1/16" between the table and the abrasive disc. The workpiece could be drawn into the space between the abrasive disc and the table. 13. SUPPORT THE WORKPIECE firmly with a miter gauge, backstop, or work table when sanding with a belt. Hold the workpiece firmly. Loss of control of the workpiece can result in injury. 14.
POWER CONNECTIONS A separate electrical circuit should be used for your machines. This circuit should not be less than #12 wire and should be protected with a 20 Amp time lag fuse. If an extension cord is used, use only 3-wire extension cords which have 3prong grounding type plugs and matching receptacle which will accept the machine’s plug.
3. 240 VOLT SINGLE PHASE OPERATION The motor supplied with your saw is a dual voltage, 120/240 volt motor. It is set at the factory at 120 volts. If it is desired to operate your machine at 240 volts, single phase, it is necessary to reconnect the motor leads in the motor junction box by following instructions given on the motor nameplate. GROUNDED OUTLET BOX CURRENT CARRYING PRONGS MAKE SURE MOTOR IS DISCONNECTED FROM POWER SOURCE BEFORE RECONNECTING MOTOR LEADS.
FUNCTIONAL DESCRIPTION FOREWORD Delta Model 31-300 is an industrial/commercial duty 1-1/2 HP belt/disc sander. The induction-type, ball-bearing motor provides long-lasting, smooth performance. The Sanding Center can provide 3000 SFPM with the belt, and the disc will revolve at 2100 RPM. NOTICE: THE PHOTO ON THE MANUAL COVER ILLUSTRATES THE CURRENT PRODUCTION MODEL.
For assembling stand: 21. 5/16-18 x 5/8" Carriage Bolt (32) 22. 5/16" Lock Washer (32) 23. 5/16" Flat Washer (32) 24. 5/16"-18 Hex nut (32) 29 21 30 22 23 To attach center to stand 25. 5/16 x 1/2" Hex Head Bolt (4) 26. 5/16" Lock Washer (4) 27. #10-32 x 1/2" Machine screws (4) 28. #10 Flat Washers (4) To attach motor to stand: 29. 1/2" Flat Washer (2) 30. 1/2" Locknut (2) 31. 1/2-13 x 3/4" Hex Head Bolt (2) 32. 5/16" Lock Washer (2) 33. 5/16" Flat Washer (2) 34. 5/16" Wing Nut (2) 35.
ATTACHING MOTOR TO STAND DISCONNECT MACHINE FROM POWER SOURCE. The motor comes with an attachment bracket installed. 1. Locate the welded bracket (A) Fig. 7 underneath the top shelf of the stand. 2. Place the motor attachment bracket (B), so that the holes in the attachment bracket align with the holes in the welded bracket (A). 3. Insert the hex head bolts - one of which is shown at (C) - and flat washers, in the holes from the inside out. 4.
ATTACHING SANDING DISC DISCONNECT MACHINE FROM POWER SOURCE. 1. 2. 3. 4. 5. Clean the sanding disc plate (A) Fig. 9 of any oil or grease, and be certain that it is dry. Peel approximately 1/2 of the backing (B) Fig. 9 from the sanding disc (C). Insert the sanding disc (C) Fig. 9 with the paper backing downward between the disc assembly and the disc guard. Press the top half of the sanding disc firmly against the disc assembly (Fig. 10).
ATTACHING BELT TABLE B D E A C Fig. 14 Fig. 15 DISCONNECT MACHINE FROM POWER SOURCE. 1. 2. 3. Insert the trunnion key (A) Fig. 14 into the slot on the side of the sanding arm (B). Thread the stud (C) into the hole (D) on the side of the sanding arm. Attach the washer, nut, lever, spring, and locknut (Inset - Fig 15) 4. Tighten the lever (E) Fig.15. OPERATION OPERATIONAL CONTROLS AND ADJUSTMENTS A A A Fig. 16 Fig. 17 Fig. 18 STARTING AND STOPPING THE MACHINE The on-off switch (A) Fig.
LOCKING SWITCH IN THE “OFF” POSITION IMPORTANT: When the tool is not in use, the switch should be locked in the “OFF” position to prevent unauthorized use, using a padlock (A) Fig. 17 with a 3/16" diameter shackle. OVERLOAD PROTECTION The motor supplied with your sander is equipped with a reset overload relay button (A) Fig. 18.
NOTE: After a long period of time, adjustments may be necessary to maintain the tension and tracking of the sanding belt. If the belt will not hold its tension, tighten the set screw (G) Fig. 22. If the belt will not hold its tracking, tighten the set screw (F) Fig. 22. F Make only small adjustments to these screws. Over-tightening will lock the tension lever and/or the tracking knob. G Fig. 22 ADJUSTING SANDING BELT TABLE 90 DEGREES TO BELT F E A C B D Fig. 23 Fig.
ADJUSTING BELT SANDER TABLE MITER GAUGE SLOT PARALLEL TO SANDING BELT DISCONNECT MACHINE FROM POWER SOURCE 1. 2. Position the table (A) (Figs. 27 and 28) 90 degrees to the belt. Place a square (B) in the miter gauge slot with the blade (C) of the square touching the sanding belt. Check the opposite end of the belt to see if the miter gauge slot (D) is parallel to the belt. To adjust, loosen the three (3) screws (E) Fig. 29, located underneath the table.
ADJUSTING SANDING DISC TABLE 90 DEGREES TO DISC DISCONNECT MACHINE FROM POWER SOURCE E A B F Fig. 33 Fig. 32 1. Loosen the disc table lock handle (A) Fig. 32, and move the table (B) Fig. 33 until the it contacts the stop. Tighten the lock handle (A) Fig. 32. 2. Place a square (E) Fig. 33 on the table and against the sanding disc. See if the table is 90 degrees to the disc. 3. To adjust, loosen the lock handle (A) Fig. 32, and tighten or loosen the screw (F) Fig.
A B D A C Fig. 36 Fig. 37 4. To adjust, loosen the four screws, two of which are shown at (D) Fig. 36. Adjust the table until the miter gauge slot is parallel to the disc. Tighten the four screws (D). NOTE: When making this adjustment, tighten the lock handle (A) Fig. 36. IMPORTANT: Maintain a maximum distance of 1/16" between the sanding disc and the table. POWER TAKE-OFF SHAFT DISCONNECT MACHINE FROM POWER SOURCE 1. 2. A power take-off shaft (A) Fig.
MACHINE USE A A B Fig. 45 Fig. 44 SURFACING OR EDGE SANDING WITH SANDING BELT When surfacing (Fig. 44) or edge sanding (Fig. 45), place the sanding arm in the horizontal position and use the table (A) Fig. 44 and Fig. 45 to keep the workpiece in place. Hold the workpiece firmly and keep your fingers away from the sanding belt. Place the end of the workpiece against the table and move the workpiece evenly across the sanding belt. Apply only enough pressure to allow the sanding belt to remove material.
B A C Fig. 49 Fig. 48 END SANDING WITH THE DISC When sanding the ends of narrow workpieces, use the sanding disc and an accessory miter gauge (A) Fig. 48. Move the work from the center to the left side (downward) of the sanding disc. ALWAYS SAND ON THE LEFT SIDE (DOWNWARD ROTATION SIDE) OF THE SANDING DISC. SANDING ON THE RIGHT SIDE (UPWARD ROTATION SIDE) OF THE SANDING DISC COULD CAUSE THE WORKPIECE TO FLY UP, WHICH COULD BE HAZARDOUS. THE EDGE OF THE TABLE (C) FIG.
TROUBLESHOOTING For assistance with your machine, visit our website at www.deltamachinery.com for a list of service centers or call the DELTA Machinery help line at 1-800-223-7278 (In Canada call 1-800-463-3582). MAINTENANCE KEEP MACHINE CLEAN LUBRICATION Periodically blow out all air passages with dry compressed air. All plastic parts should be cleaned with a soft damp cloth. NEVER use solvents to clean plastic parts. They could possibly dissolve or otherwise damage the material.
ACCESSORIES A complete line of accessories is available from your Delta Supplier, Porter-Cable • Delta Factory Service Centers, and Delta Authorized Service Stations. Please visit our Web Site www.deltamachinery.com for a catalog or for the name of your nearest supplier. Since accessories other than those offered by Delta have not been tested with this product, use of such accessories could be hazardous. For safest operation, only Delta recommended accessories should be used with this product.
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PORTER-CABLE • DELTA SERVICE CENTERS (CENTROS DE SERVICIO DE PORTER-CABLE • DELTA) Parts and Repair Service for Porter-Cable • Delta Machinery are Available at These Locations (Obtenga Refaccion de Partes o Servicio para su Herramienta en los Siguientes Centros de Porter-Cable • Delta) ARIZONA Phoenix 85013-2906 4501 N. 7th Ave.