Assessments - 5, GPA: 4
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Facilidade de uso
• Plug your hammer drill into power supply source. • Hold your drill firmly and place bit at point to be drilled. • Depress the switch trigger to start your drill. Do not lock the switch ON for jobs where your drill may need to be stopped suddenly. • Move the drill bit into the workpiece applying only enough pressure to keep the bit cutting. Do not force your drill or apply side pressure to elongate a hole. Let your drill and bit do the work. See Figure 11. ,_ WARNING: Be prepared for binding or break through. When these situations occur, drill has a tendency to grab and kick in the opposite direction and could cause loss of control when breaking through material. This loss of control can result in possible serious injury. Do not lock the trigger on jobs where your drill may need to be stopped suddenly. When drilling hard, smooth surfaces use a center punch to mark the desired hole location. This will prevent the drill bit from slipping off center as the hole is started. When drilling metals, use a light oil on the drill bit to keep it from overheating. The oil will prolong the life of the bit and increase the drilling action. If the bit jams in the workpiece or if your drill stalls, stop the tool immediately. Remove the bit from the workpiece and determine the reason for jamming. WOOD DRILLING • For maximum performance use high speed steel bits for wood drilling. • Slide adjustment button on hammer drill down for normal drilling action. • Begin drilling at a very low speed to prevent the bit from slipping off the starting point. Increase the speed as the drill bit bites into the material. • When drilling through holes, place a block of wood behind the workpiece to prevent ragged or splintered edges on the back side of the hole. • Do not lock the trigger ON for jobs where your hammer drill may need to be stopped suddenly. METAL DRILLING • For maximum performance use high speed steel bits for metal or steel drilling. LEVEL ENDVIEW Fig. 11 • Slide adjustment button on hammer drill down for normal drilling action (drill mode). • Begin drilling at a very low speed to prevent the bit from slipping off the starting point. • Maintain a speed and pressure which allows cutting without overheating the bit. Applying too much pressure will: Overheat the drill; Wear the bearings; Bend or burn bits; and Produce off-center or irregular shaped holes. • When drilling large holes in metal, we recommend that you drill with a small bit first, then finish with a larger bit. Also, lubricate the bit with oil to improve drilling action and increase bit life. MASONRY DRILLING • For maximum performance use carbide-tipped masonry impact bits when drilling holes in brick, tile, concrete, etc. • Slide adjustment button on hammer drill up for hammer mode. • Apply light pressure and medium speed for best results in brick. • Apply additional pressure for hard materials such as concrete. • When drilling holes in tile, practice on a scrap piece to determine the best speed and pressure. Page 11 CHUCKREMOVAL See Figure 12. The chuck must be removed in order to use some accessories. To remove: • Unplug your drill. _k WARNING: Failure to unplug your drill could result in accidental starting causing serious injury. • Insert a 8 mm (5/16 in.) or larger hex key into the chuck of your drill and tighten chuck jaws securely. • Tap the hex key sharply with a mallet in a counterclockwise direction. See Figure 12. • This will loosen the chuck on the spindle, • It can now be unscrewed by hand. See Figure 12. • Open chuck jaws and remove hex key. TO RETIGHTEN A LOOSE CHUCK The chuck may become loose on the spindle and develop a wobble. To tighten, follow these steps: • Unplug your drill, _k WARNING: Failure to unplug your drill couldresult in accidental starting causing serious injury. • Open the chuck jaws. • Insert hex key into chuck and tighten chuck jaws securely. Tap hex key sharply with a mallet in a clockwise direction. • This will tighten the chuck on the spindle. • Open the chuck jaws and remove the hex key. HEX KEY CHUCK Fig. 12 Page 12 GENERAL Only the parts shown on parts list, page 17, are intended to be repaired or replaced by the customer. All other parts represent an important part of the double insulation system and should be serviced only at a Sears Service Center. Avoid using solvents when cleaning plastic parts. Most plastics are susceptible to damage from various types of commercial solvents and may be damaged by their use. Use clean cloths to remove dirt, carbon dust, etc. WARNING: Do not at any time let brake fluids, gasoline, petroleum-based products, penetrating oils, etc. come in contact with plastic parts. They contain chemicals that can damage, weaken or destroy plastic. It has been found that electric tools are subject to accelerated wear and possible premature failure when they are used on fiberglass boats, sports cars, wallboard, spackling compounds, or plaster. The chips and grindings from these materials are highly abrasiv...