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2610042685 DDH183 HDH183.qxp_DDH - HDH 1/22/16 12:26 PM Page 14
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
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.
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
Before
using
accessory, be certain that
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.
an
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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