Bosch Power Tools RH228VC-B manual Tool Tips, JAW Chuck, Drilling Wood or Plastic

BM 1619929E69 03-11:BM 1619929E69 03-11.qxp 3/28/11 2:03 PM Page 11

TOOL TIPS

Following a few simple tips will reduce wear on the tool and the chance of injury to the operator.

NOTE: The high efficiency available from the rotary hammers can only be obtained if sharp and undamaged accessories are used. The “cost” to maintain sharp and undamaged accessories is more than offset by the “time saved” in operating the tool with sharp accessories.

All hammers require a short period of time to warm up. Depending on the room temperature, this time may vary from approximately 15 seconds (90˚F) to 2 minutes (32˚F).

Anew hammer requires a break-in period before full performance is realized. This period may require up to 5 hours of operation.

You will extend the life of your bits and do neater work if you always put the bit in contact with the workpiece BEFORE pulling the trigger. During operation, hold the drill firmly and exert moderate, steady pressure. Too much pressure at low speed will stall the hammer. Too little pressure will keep the bit from cutting and cause excess friction by sliding over the surface. This can be damaging to the drill and bit.

Carbide tipped bits: Used for drilling stone, concrete, cement, brick, cinder block and other unusually hard non-metals.

3-JAW CHUCK

(Drill only mode)

The 3-Jaw Chuck with SDS-plus®Shank Adaptor accessory can convert your tool for use with straight shank bits.

Shanks of all drill bits should be wiped clean prior to using and immediately after removing.

Recall these instructions for safe operation:

1.All work must be supported or secured before drilling and steady, even pressure applied in line with the drill bit.

2.As the drill bit cuts through the opposite side, reduce the pressure and continue running the drill as the bit is withdrawn.

3.Some materials require slow drilling speeds; whereas, others require higher speed to produce the best results. Materials such as glass, porcelain, ceramics, tiles, plastics, etc., should be drilled at low speeds with specially designed drill bits and lubricants.

DRILLING WOOD OR PLASTIC

(Drill only mode)

If backing block is not used, ease up on the pressure just before the bit breaks through the wood to avoid splintering. Complete the hole from the opposite side immediately after the point breaks through. If bit binds, reverse the drilling operation to help remove the bit from the work.

DRILLING METAL (Drill only mode)

There are two rules for drilling hard materials. First, the harder the material, the greater the pres sure you need to apply to the tool. Second, the harder the material, the slower the speed. Here are a couple of tips for drilling in metal. Make a center punch in the material for easier starting. Lubri cate the tip of the bit occasionally with cutting oil except when drilling soft metals such as alu minum, cop per or cast iron. If the hole to be drilled is fairly large, drill a smaller hole first, then enlarge to the required size, it’s often faster in the long run. Main aint enough pressure to assure that the bit does not just spin in the hole. This will dull the bit and greatly shorten its life.

DRILLING MASONRy

Use carbide-tipped masonry bit for cinder block, mortar, common brick, soft stone and other materials. The amount of pressure to be used is dependent upon the type of material being drilled. Soft materials require less pressure while the hard materials need more pressure to prevent the drill bit from spinning.

-11-