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Operating Instructions TRIGGER SWITCH AND “LOCK-ON” BUTTON Your sander can be turned “ON” or “OFF” by squeezing or releasing the trigger. Your sander is also equipped with a “Lock-ON” button located just above the trigger that allows continuous operation without holding the trigger TO LOCK SWITCH ON: squeeze trigger, depress “Lock-ON” button and release trigger. TO UNLOCK THE SWITCH: squeeze trigger and release it without depressing the “Lock- ON” button. ! WARNING If the “Lock-ON” button is continuously being depressed, the trigger cannot be released. VARIABLE SPEED DIAL (1275DVS & 1276DVS) This tool is equipped with a variable speed dial. The belt speed may be controlled by presetting the dial in any one of six positions. Dial setting 3 thru 5 3 thru 5 4 thru 6 3 thru 6 -7 Material/Application Delicate surfaces, veneers, and with sanding frame for light surface finishing. Plastics or other surfaces where belt loading or heat buildup is a problem Solid wood, fast stock removal, paint removal General service, metal sanding, chipboard, coarse sandingon rough surfaces BM 2610967913 9/03 9/26/03 4:56 PM Page 8 TRACKING ADJUSTMENT Turn sander upside down and plug it into the power source. Hold the sander firmly with one hand, engage trigger switch to turn the tool “ON”, and note the tracking of the sanding belt. If the belt runs outward (towards the open side of the sander) turn tracking adjustment knob counter-clockwise. If the belt runs inward, turn the knob clockwise. Adjust the belt in this manner until the edge of the belt runs flush with the outer edge of both pulleys and covers the platen protector. Your sander is now ready for use. In some cases, the belt will require a slight readjustment after it is applied to the work surface, so note the tracking carefully during the first minutes of operation and readjust as required. ADJUSTABLE TOP HANDLE The top handle provided should always be used to guide and balance the tool. Grip the tool by the multi-position top handle, and the rear handle, for safe control and ease of operation. To adjust the top handle, loosen wing knob at least two full turns, position handle and retighten knob firmly. DUST EXTRACTION Proper dust removal will extend abrasive life and produce more consistent results. The integral dust extraction system collects sanding dust in the dust bag assembly. Bag should be emptied when it is no more than half full, and should be replaced when the surface becomes clogged with dust or efficiency will be reduced. To empty or replace bag, pull the bag free of dust port. Open the zipper on the rear of the bag, and empty contents into suitable receptacle. To install bag, firmly push the bag into place on the dust port so that it covers the "O" ring to create a seal and the metal flange on dust TRACKING ADJUSTMENT KNOB bag makes contact with the static clip as shown. The static clip is provided to dissipate static electricity that accumulates in the bag and can cause annoying shock to the user. For added efficiency, a vacuum hose and adaptor (optional accessories) are also available which will allow your sander to be connected to a shop vacuum system. See your Bosch catalog for optional Bosch Airsweep accessories. METAL DUST BAG STATIC CLIP FLANGE Sanding Tips “open coat” will not clog or fill as readily as “closed coat”. In general, aluminum oxide SELECTING THE SANDING BELT abrasive belts are best for woodworkingIt is very important that you select the proper because they are tougher and last longer. belt for each particular application. To do this Sanding belts should be stored in a cool, dryyou should understand the method of marking place. Do not store near heat or near a windowor coding on the back of most belts. “CLOSED where the sun can reach them. COAT” means the surface is densely covered TECHNIQUE with as much grit as the adhesive will hold. Grasp the handles firmly. Start the sander with “OPEN COAT” means the grit has been the belt off the work (NOTE: never start or stop applied evenly, but openly to the surface. An -8 BM 2610967913 9/03 9/26/03 4:56 PM Page 9 the tool with the belt in contact with the work surface). Place the heel of the sander on the work first. Then, with a forward motion, begin the sanding stroke as the machine is lowered onto the work surface. This will prevent gouging. Keep the sander moving so that your work will be smooth and even. The stroke is simply a back-and-forth movement with most of the sanding done on the pull movement. Use a light touch. The weight of the belt sander is the only pressure required. Too much pressure will slow the work by overloading the motor and reducing belt speed. The result will be decreased sanding efficiency. Sand slowly and systematically and, when you stop, lift the sander from the surface before stopping the tool. WOOD FINISHING Take care to select belts wisely. For initial smoothing of rough lumber, use coarse or very coarse grit and sand with the grain. On very uneven or hard wood, ...

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