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2610056809 GSR GSB18V-975C 03-21.qxp_GSB18V-975C 3/5/21 4:34 PM Page 20
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.
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, always be sure the
excess string that secures the bonnet 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 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.
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Operating Tips
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.
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.
INCORRECT: Excessive pressure can cause wire breakage.
SAVE THESE INSTRUCTIONS
CORRECT: Wire tips doing the work.
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