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Drilling operation
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Drilling
in
wood
When drilling
in
wood, best results are obtained with wood drills equipped with a guide
screw. The guide screw makes drilling easier by pulling the bit into the workpiece.
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Drilling
in
metal
To prevent the bit from slipping when
starting a hole, make
an
indentation with
a centerpunch and hammer at the point
to
be drilled. Place the point
of
the bit
in
the indentation and start drilling.
Use a cutting lubricant when drilling
metals. The exceptions are
iron
and brass
which should be drilled dry.
CAUTION
:
*Pressing excessively on the tool will not speed up the drilling.
In
fact, this excessive
pressure will only serve to damage the tip
of
your bit, decrease the tool performance
and shorten the service life
of
the tool.
*There is a tremendous force exerted on the tool/bit at the time of hole breakthrough.
Hold the tool firmly and exert care when the bit begins to break through the workpiece.
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A stuck bit can be removed simply by setting the reversing switch
to
reverse rotation
in
order to back
out.
However, the tool may back
out
abruptly
if
you do
not
hold
it
firmly.
Always secure small workpieces
in
a vise
or
similar hold-down device.
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