Bosch GSB18V-1330C Instrucciones De Funcionamiento Y Seguridad página 21

Drilling Wood
Be certain workpiece is clamped or anchored firm ly.
Always apply pressure in a straight line with the drill bit.
Maintain enough pressure to keep the drill "biting".
When drilling holes in wood, twist bits can be used.
Twist bits may overheat unless pulled out frequently to
clear chips from flutes.
Use a "back-up" block of wood for work that is likely to
splinter, such as thin materials.
You will drill a cleaner hole if you ease up on the
pressure just before the bit breaks through the wood.
Then complete the hole from the back side.
Drilling Metal
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. 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.
Drilling Masonry
Soft materials such as brick are relatively easy to drill.
Concrete however, will require much more pressure to
keep the bit from spinning. Be sure to use carbide tip
bits for all masonry work.
Best performance drilling in masonry is achieved when
in drill and hammer mode (GSB18V-1330C model
only).
Before using an accessory, be
certain that its maximum safe
operating speed is not exceeded by the nameplate
speed of the tool. Do not exceed the recommended
wheel diameter.
Sanding and Polishing
Fine sanding and polishing re quire "touch". Select the
most efficient speed.
When using polishing bonnets, alway be sure the excess
string that secures the bonnet is tucked well within the
bonnet during operation.
Operating Tips
Wire Brushes
Work with brushes requires high speeds.
Brushing Pressure
1. Let the tips of a wire brush do the work. Operate the brush
with the lightest pressure so only the tips of the wire come
in contact with the work.
2. If heavier pressures are used, the wires will be
overstressed, resulting in a wiping action; and if this is
continued, the life of the brush will be shortened due to
wire fatigue.
3. Apply the brush to the work in such a way that as much of
the brush face as possible is in full contact with the work.
Applying the side or edge of the brush to the work will result
in wire breakage and shortened brush life.
CORRECT: Wire tips doing the work.
INCORRECT: Excessive pressure can cause wire breakage.
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