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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
pressure 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.
Lubricate
the tip of the bit occasionally
with
cutting oil except when drilling soft metals such
as aluminum,
copper 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.
_
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
require
"touch".
Select the most efficient speed.
WIRE BRUSHES
Work with brushes requires high speeds.
BRUSHING
PRESSURE
1. Remember,
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.
15 °
INCORRECT: E xcessive pressurecan causewire breakage.
RUNNING NUTS AND BOLTS
Variable
speed
control
must
be used
with
caution
for driving
nuts and bolts with socket
set attachments.
The technique
is to start
slowly, increasing speed as the nut or bolt runs
down. Set the nut or bolt snugly by slowing the
drill to a stop. If this procedure
is not followed,
the tool will have a tendency
to torque or twist
in your hands when the nut or bolt seats.
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