Bosch 11253VSR Specifications download pdf (Page 9)

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). A new hammer requires a

break-in period before full performance is

realized. This period may require up to 5

hours of operation.

Carbide tipped bits: Used for drilling stone,

concrete, cement, brick, cinder block and

other unusually hard non-metals. The Rotary

Hammer is designed for "SDS" Carbide

Tipped Bits up to 3/4 inch diameter.

3 JAW CHUCK

The 3 Jaw Chuck with SDS Shank Adaptor

accessory can convert your tool for use with

straight shank bits.

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.

Shanks of all drill bits should be wiped clean

prior to using and immediately after removing.

Recall these instructions for safe operation:

1. Some materials require slow drilling

speeds; whereas, others require higher speed

to produce the best results.

2. All work must be supported or secured

before drilling and steady, even pressure

applied in line with the drill bit.

3. As the drill bit cuts through the opposite

side, reduce the pressure and continue

running the drill as the bit is withdrawn.

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

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

There are two rules for drilling hard materials.

First, the harder the material, the greater the

pressure 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. Lubricate the tip of the bit

occasionally with cutting oil except when drilling

soft metals such as aluminum, copper 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. Maintain

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.

-g.

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