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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 t o reverse rotation
in
order to back out. However, the tool may back out abruptly if you d o 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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