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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.
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 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 it firmly.
*Always secure small workpieces
in
a
vise
or
similar hold-down device.
Overlaod protector
The overload protector automatically cuts out
to
break the circuit whenever heavy work
is prolonged.
Wait
20-30
seconds before resuming operation.
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