Assessments - 3, GPA: 4.3 ( )

Fabricante : Bosch Arquivo Tamanho: 2.37 mb Arquivo Nome : Língua de Ensino:

TO UNLOCK SWITCH AND TURN TOOL "ON": Push switch release lever backward to unlock ON/OFF switch, then squeeze paddle switch (Fig. 6). TO SWITCH TOOL "OFF": Release pressure on paddle lever. The switch is spring loaded and will return to "OFF" position automatically. "LOCK-ON" BUTTON (Models 1810PS & 1811PS only) The "Lock-ON" feature, incorporated into the paddle switch, is a convenience for long operations. TO LOCK SWITCH "ON": After paddle switch has been activated push "Lock-ON" button at rear of tool completely in and release paddle switch (Fig. 6). TO SWITCH TOOL "OFF": Squeeze and release paddle switch. PADDLE SWITCH "LOCK-OFF" SWITCH RELEASE LEVER "LOCK-ON" BUTTON (Models 1810PS & 1811PS only) FIG. 6 Grinding Operations SELECTING GRINDING WHEELS type of wheel to use is determined by the job. Before using a grinding Use disc grinding wheels for fast grinding of wheel, be certain that its structural steel, heavy weld beads, steel maximum safe operating speed is not casting, stainless steel and other ferrous exceeded by the nameplate speed of the metals. grinder. Do not exceed the recommended !WARNING GRINDING TIPS wheel diameter. Efficient grinding is achieved by controlling the DISC GRINDING WHEELS pressure and keeping the angle between Grinding wheels should be carefully selected in wheel and workpiece at 10° to 15°. If the wheel order to use the grinder most efficiently. is flat, the tool is difficult to control. If the angle Wheels vary in type of abrasive, bond, is too steep, the pressure is concentrated on a hardness, grit size and structure. The correct small area causing burning to the work surface. -9 BM 1609929J65 02-08 2/20/08 11:30 AM Page 10 BM 1609929J65 02-08 2/20/08 11:30 AM Page 10 !WARNING Excessive or sudden pres-When grinding with a new wheel be certain to sure on the wheel will slow grind while pulling tool backwards until wheel grinding action and put dangerous stresses on becomes rounded on its edge. New wheels the wheel. have sharp corners which tend to “bite” or cut into workpiece when pushing forward. Sanding Operations SELECTING SANDING DISC at times both “open coat and closed coat” Sanding discs are made of extremely hard discs are required to get the job done faster. and sharp aluminum oxide grits, phenol-resin See chart for application examples. 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 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 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 appear, then stop and change to a “closed coat” disc to remove any remaining paint. 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. -10 BM 1609929J65 02-08 2/20/08 11:30 AM Page 11 BM 16099...

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