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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.
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 pres-
sure 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.
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 itfirmly.
Always secure small workpieces in
a
vise
or
similar hold-down device.
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