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CARBIDE TIPPED BITS: Used for drilling
stone, concrete, plaster, cement and other
unusually hard nonmetals. Use continuous
heavy feed pressure when employing carbide
tip bits.
Drilling Wood
Be certain workpiece is clamped or anchored
firmly. 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 materi-
als. 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 drill-
ing in metal. Lubricate the tip of the bit oc-
casionally with cutting oil except when drill-
ing soft metals such as aluminum, 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. 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
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.
2610070415 GSR18V800FC 202310.indd 27
Operating Tips
page heading
Best performance drilling in masonry is
achieved when in drill and hammer mode
(GSB18V-800C model only).
Sanding and Polishing
Fine sanding and polishing re quire "touch".
Select the most efficient speed.
When using polishing bonnets, always be
sure the excess string that secures the bon-
net is tucked well within the bonnet during
operation.
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 pres-
sure 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 pos-
sible is in full contact with the work. Ap-
plying the side or edge of the brush to
the work will result in wire breakage and
shortened brush life.
INCORRECT: Excessive pressure can cause wire breakage.
CORRECT: Wire tips doing the work.
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10/24/23 3:15 PM
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