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Фрагмент инструкции
Sanding Operations 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 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. 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, SANDING TIPS wipe the metal clean with a non-flammable For best results, tilt the Disc Sander at a 10° solvent or commercial cleaner to remove all to 15° angle while sanding so that only about wax and grease. By doing this first, the 1" of the surface around the edge of the disc sanding discs will sand better and last contacts the work. longer. If the disc (accessory) is held flat or the back For heavy duty work, use a coarse grit disc edge of the disc comes in contact with the first. Follow-up with a medium grit to remove work, a violent thrust to the side may result. scratches. To produce smooth finish, use If sander is tilted too much, sanding action fine grit disc. will be too great and a rough cut surface or gouging and snagging will result. -9 BM 1609929A20 3/03 3/12/03 10:35 AM Page 10 Grinding Operations ELECTING GRINDING WHEELS 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 pressure 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. Wire Brush Operations Wire brushes are intended to “clean” ! WARNING Avoid bouncing and snag- structural steel, castings, sheet metal, stone ging the wire brush, espeand concrete. They are used to remove rust, cially when working corners, sharp edges scale and paint. etc. This can cause loss of control and kickback. -10 BM 1609929A20 3/03 3/12/03 10:35 AM Page 11 Maintenance Service Preventive maintenance performed by unauth ! WARNING orized personnel may result in misplacing of internal wires and components which could cause serious hazard. We recommend that all tool service be performed by a Bosch Factory Service Center or Authorized Bosch Service Station. TOOL LUBRICATION Your Bosch tool has been properly lubricated and is ready to use. It is recommended that tools with gears be regreased with a special gear lubricant at ev...
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