Bosch GBH2-28L Consignes D'utilisation/De Sécurité page 12

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.
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
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running the drill as the bit is withdrawn.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.
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.
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 tain enough
pressure to assure that the bit does not just
spin in the hole. This will dull the bit and
greatly shorten its life.
Use carbide-tipped masonry bit for cinder
block, mortar, common brick, soft stone and
Shank
®
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.
-12-
DRILLING WOOD OR PLASTIC
(Drill only mode)
DRILLING METAL
(Drill only mode)
DRILLING MASONRY