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The grinder’s RPM can be preset from zero to maximum nameplate rated RPM by rotating the dial on the motor housing. If tool is running at a set speed for extended periods of time, it may be necessary to run the tool at no- load full speed to cool the motor. -9 Dial Setting Approx. RPM Application Material Attachment 1 (2800) Polishing Plastic Precision grinding of metal tools Lambswool bonnet felt polishing disc, or buffing disc. Grinding disc 2-3 (5300-7500) Solid wood & paint removal Sanding disc 3 (7500) Brushing wood Removing rust from metal Cup brush Sanding disc 4-6 (8800-11000) Grinding metal or stone Grinding disc 6 (11000) Roughing metal Cutting stone Roughing disc Cutting disc BM 1609929C33 10/03 10/28/03 2:49 PM Page 10 Grinding Operationw SELECTING GRINDING WHEELS !WARNING Before using a grinding wheel, be certain that its maximum safe operating speed is not exceeded by the nameplate speed of the grinder. Do not exceed the recommended wheel diameter. DISC GRINDING WHEELS Grinding wheels should be carefully selected in order to use the grinder most efficiently. Wheels vary in type of abrasive, bond, hardness, grit size and structure. The correct type of wheel to use is determined by the job. Use disc grinding wheels for fast grinding of structural steel, heavy weld beads, steel casting, stainless steel and other ferrous metals. GRINDING TIPS Efficient grinding is achieved by controlling the pressure and keeping the angle between wheel and workpiece at 10° to 15°. If the wheel is flat, the tool is difficult to control. If the angle is too steep, the pressure is concentrated on a small area causing burning to the work surface. !WARNING Excessive or sudden pres sure on the wheel will slow grinding action and put dangerous stresses on the wheel. When grinding with a new wheel be certain to grind while pulling tool backwards until wheel becomes rounded on its edge. New wheels have sharp corners which tend to “bite” or cut into workpiece when pushing forward. Sanding Operationw SELECTING SANDING DISC Sanding discs are made of extremely hard and sharp aluminum oxide grits, phenol- resin bonded to a sturdy fiber backing for fast heavy-duty service and long life. The discs vary as to size and spacing of the abrasive grits. OPEN COAT (type H) — used for soft materials and on paint or varnish. CLOSED COAT (type K) —used for metal, hardwood, stone, marble and other materials. Sanding discs range in grit from 16 (very coarse) to 180 (very fine). To obtain best results, select sanding discs carefully. Many jobs require the use of several grit sizes and at times both “open coat and closed coat” discs are required to get the job done faster. See chart for application examples. Operation: Refinishing painted wood or metal surfaces. REMARKS GRIT To remove paint and to smooth surface irregularities. Coarse 16-24-30 To smooth the rough sanding. Medium 36-50-80 To remove scratches left by previous discs. Fine 100-120 To smooth surfaces for painting, polishing or waxing. Very Fine 150-180 SANDING TIPS For best results, tilt the Disc Sander at a 10° to 15° angle while sanding so that only about 1" of the surface around the edge of the disc contacts the work. !WARNING If the disc (accessory) is held flat or the back edge of the disc comes in contact with the work, a violent thrust to the side may result. If sander is tilted too much, sanding action will be too great and a rough cut surface or gouging and snagging will result. Guide the Disc Sander with crosswise strokes. Be careful not to hold the sander in one spot too long. Do not use a circular motion, as this makes swirl marks. Test before use on scrap stock. Do not force or apply pressure when sanding. Use only the weight of the tool for pressure. Excess pressure actually slows the tool down. If faster stock removal is desired, change to a coarser grit disc. Remove gummy paint from metal with an “open coat” disc. Sand until sparks start to appear, then stop and change to a “closed coat” disc to remove any remaining paint. -10 BM 1609929C33 10/03 10/28/03 2:49 PM Page 11 SANDING WOOD When sanding wood the direction of the disc motion at the contact point should parallel the grain as much as possible. The rapid cut of discs and the swirl type scratch pattern they occasionally create generally prohibit their use for producing the final finish. Scratches and circular marks are usually the result of using too coarse a grit. When changing to a finer grit, move across the sanding lines that were made by a previous coarser disc. SANDING METAL When sanding automobiles or appliances, wipe the metal clean with a non-flammable solvent or commercial cleaner to remove all wax and grease. By doing this first, the sanding discs will sand better and last longer. For heavy duty work, use a coarse grit disc first. Follow-up with a medium grit to remove scratches. To produce smooth finish, use fine grit disc. Wire Brush Operations Wire brushes are intended to “clean” !WARNING Avoid bo...
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