Tool Tips; Drilling Metal; Drilling Masonry - Bosch GBH18V-24C Operating/Safety Instructions Manual

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 ro-
tary 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 operat-
ing the tool with sharp accessories.
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 moder-
ate, 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 pro-
duce the best results.
2. All work must be supported or secured be-
fore drilling and steady, even pressure ap-
plied in line with the drill bit.
3. As the drill bit cuts through the opposite
side, reduce the pressure and continue run-
ning the drill as the bit is withdrawn.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 lu-
bricants.
1605A000XG GBH18V-24C 202208.indd 16
Operating Instructions page heading
Drilling Wood or Plastic
If backing block is not used, ease up on the pres-
sure 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 opera-
tion to help remove the bit from the work.

Drilling Metal

Make a center punch in the material for easier
starting. Use enough pressure to keep the bit
cutting. If the bit is allowed to merely spin in
the hole, it will become dull within a short time.
When drilling a larger hole, it is faster and easier
on your power pack to first make a smaller hole
and enlarge it to the required size. Lubricate the
tip of the bit occasionally with CUTTING OIL for
easier metal drilling. If bit binds, reverse the
drilling to help remove the bit from the work.

Drilling Masonry

Use carbide-tipped masonry bit for cinder block,
mortar, common brick, soft stone and other ma-
terials. The amount of pressure to be used is de-
pendent 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.
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