Bosch 18636-01 Operating Instructions - Page 13

BM 2610944508 11-06 12/1/06 3:29 PM Page 13 Operating Tips TETHER HOOK The purpose of the tether hook is to secure the tool when working on ladders, scaffolding, or elevated heights to prevent the tool from hitting the ground if accidentally dropped. For best results, it is recommended to use 1/4" braided nylon rope or similar material. You will extend the life of your bits and do neater work if you always put the bit in contact with the work before pulling the trigger. During the operation, hold the tool firmly and exert light, steady pressure. Too much pressure at low speed will stall the tool. Too little pressure will keep the bit from cutting and cause excess friction by sliding over the surface. This can be damaging to both tool and bit. DRILLING WITH VARIABLE SPEED The trigger controlled variable speed feature will eliminate the need for center punches in hard materials. The variable speed trigger allows you to slowly increase RPM. By using a slow starting speed, you are able to keep the bit from "wandering". You can increase the speed as the bit "bites" into the work by squeezing the trigger. DRIVING WITH VARIABLE SPEED Variable speed drills will double as a power screwdriver by using a screwdriver bit in the drill mode. The technique is to start slowly, increasing the speed as the screw runs down. Set the screw snugly by slowing to a stop. Prior to driving screws, pilot and clearance holes should be drilled. FASTENING WITH SCREWS This procedure shown in (Fig. 8) will enable you to fasten materials together with your Cordless Drill/Screwdriver without stripping, splitting or separating the material. Screw drills are available for screw sizes No. 6, 8, 10 and 12. FASTENING WITH SCREWS 2. Drill same diameter as screw shank. First, clamp the pieces together and drill the first hole 2/3 the diameter of the screw. If the 1. Drill 2/3 diameter and material is soft, drill only 2/3 the proper length. If it is hard, drill the entire length. 2/3 of screw length for soft materials, full length for hard Second, unclamp the pieces and drill the materials. second hole the same diameter as the screw shank in the first or top piece of wood. Screw Third, if flat head screw is used, countersink the hole to make the screw flush with the surface. Then, simply apply even pressure when driving the screw. The screw shank clearance hole in the first piece allows the screw head to pull the pieces tightly together. Apply a slight even pressure when driving screws. 3. Countersink same diameter as screw head. Adjustable Screw Drill The adjustable screw drill accessory will do all of these operations quickly and easily. FIG. 8 DRILL BITS Always inspect drill bits for excessive wear. Use only bits that are sharp and in good condition. TWIST BITS: Available with straight and reduced shanks for wood and light duty metal drilling. High speed bits cut faster and last longer on hard materials. CARBIDE TIPPED BITS: Used for drilling stone, concrete, plaster, cement and other unusually hard nonmetals. Use continuous heavy feed pressure when employing carbide tip bits. DRILLING WOOD Be certain workpiece is clamped or anchored firmly. Always apply pressure in a straight line with the drill bit. Maintain enough pressure to keep the drill "biting". -13-