Tool Tips; Dust Extraction - Bosch GBH18V-21 Operating/Safety Instructions Manual

2610056642.qxp_GBH18V-21 2/24/20 1:08 PM Page 13
DRILLING METAL
Drilling metal requires the use of 3-jaw
chuck (sold separately).
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.

Tool Tips

Following a few simple tips will reduce
wear on the tool and the chance of
injury to the operator.
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.
For selection of dust collection systems
and operating instructions, see the
Operating / Safety Instructions for 'Dust
Extraction Attachments for Hammers
Operating Instructions
1.
2.
3.

Dust Extraction

-13-
Shanks of all drill bits should be wiped
clean prior to using and immediately
after removing.
Recall these instructions for safe
operation:
Some materials require slow drilling
speeds; whereas, others require
higher speed to produce the best
results.
All work must be supported or
secured before drilling and steady,
even pressure applied in line with the
drill bit.
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bit is withdrawn.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.
and Hammer Drills' included with your
tool or with the dust extraction
attachment.