Bosch 1274DVS Operating Instructions - Page 8

TRACKING ADJUSTMENT Turn sander upside down and hold it firmly with one hand, start motor and observe the tracking of sanding belt. If the belt runs outward, turn tracking adjustment knob clockwise, if the belt runs inward turn knob counter-clockwise. Adjust the belt until the outer edge of the belt is even with the outer edge of both front and rear pulleys. Be sure the belt does not rub against the guide strip. Once the belt stabilizes you can begin operation. In some cases, the belt will require a slight readjustment after it is applied to the work surface. Note the tracking carefully during the first minutes of operation and readjust as required. TRACKING ADJUSTMENT KNOB SANDING BELT ATTACHING AND REMOVING DUST BAG Insert support arm into dust bag holder and mount rubber adaptor onto angle adaptor To attach dust bag, push angle adaptor onto dust port as far as it will go (Fig. 1). The dust bag can be emptied by removing the dust bag from the angle adaptor and sliding bag off support arm. For most efficient dust pick-up, empty bag frequently. For added efficiency, a vacuum hose and adaptor (optional accessories) are available which will allow your sander to be connected to a shop vacuum system. See your Bosch catalog for these optional Bosch Airsweep accessories. FLUSH SANDING Your sander has been designed to allow convenient flush sanding on the right side of the sander. AUXILIARY HANDLE Your sander is equipped with a removable auxiliary handle when sanding in tight quarters. To remove handle, remove screw in handle and slide handle off sander in direction of arrow. Always reinstall handle for normal operation. SCREW AUXILIARY HANDLE Sanding Tips SELECTING THE SANDING BELT It is very important that you select the proper belt for each particular application. To do this you should understand the method of marking or coding on the back of most belts. "CLOSED COAT" means the surface is densely covered with as much grit as the adhesive will hold. "OPEN COAT" means the grit has been applied evenly, but openly to the surface. An "open coat" will not clog or fill as readily as "closed coat". In general, aluminum oxide abrasive belts are best for woodworking because they are tougher and last longer. Sanding belts should be stored in a cool, dry place. Do not store near heat or near a window where the sun can reach them. TECHNIQUE Grasp the handles firmly. Start the sander with the belt off the work (NOTE: never start or stop 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 -8-