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2610055572 GSR18V-535FC 01-2020.qxp_GSR18V-60FC 1/28/20 8:40 AM Page 24
▶ 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.
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▶ 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.
▶ 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.
INCORRECT: Excessive pressure can cause wire breakage.
SAVE THESE INSTRUCTIONS
CORRECT: Wire tips doing the work.
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