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Drilling operation
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
center-
punch and hammer a t the point to be drilled. Place the point of the bit in the indenta-
tion and start drilling.
Use
a
cutting lubricant when drilling metals. The exceptions are iron and brass which
should be drilled dry.
Drilling in metal
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
a t
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.
Screwdriving operation
Place
the p6int of the driver bit in the
screw head and apply pressure to the tool.
Start the tool.
Release
the trigger just
as
the screw bottoms out. If the trigger i s not
released, the screw may strip out the hole
or the screw and/or bit may be damaged.
-
When driving wood screws, oredrill Pilot
holes to make driving easier and to pre-
vent splitting
of
the workpiece.
See
the
chart.
Nominal diameter
of
wood screw (mml
3.1
(1/8")
3.5
(9/64")
3.8 (5/32")
Recommended size
of
pilot hole (mm)
2.0
-
2.2
(5/64"
-
3/32")
2.2
-
2.5
(3/32"
-
3/32")
2.5
-
2.8
(3/32"
-
7/64")
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