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DRILLING METAL
For maximum performance, use high-speed
steel bits for metal or steel drilling.
When drilling metals, use light oil on the drill
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bit to keep it from overheating. The oil will
prolong the life of the bit and increase the
drilling efficiency.
Begin drilling at a very low speed to prevent
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the bit from slipping off the starting point.
DRIVING SCREWS (FIG. 17)
Try to use standard-type screws for easy driving
and improved grip.
a. Install the correct driver bit.
b. Ensure that the torque-adjustment ring is set
to the most suitable setting. If in doubt, start
with a low setting and gradually increase
the setting as necessary. Do not change the
torque setting when the tool is running.
c. Use the correct gear ("1" or "2") for the job and
initially apply minimal pressure to the variable
speed trigger switch. Increase the speed only
when full control can be maintained.
d. It is advisable to drill a pilot hole first. This
hole should be slightly longer than the screw
to be driven and just smaller than the shank
diameter of the screw. The pilot hole will act
as a guide for the screw and will also make
tightening the screw less difficult. When
screws are positioned close to an edge of the
material, a pilot hole will also help to prevent
splitting of the wood.
e. Use a countersinking bit (sold separately) to
accommodate the screw head so that it does
not protrude from the surface.
Maintain a speed and a pressure that allow
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cutting without overheating the bit. Applying
too much pressure will:
Overheat the Drill.
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Wear the bearings.
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Bend or burn bits.
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Produce off-center or irregularly shaped holes.
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Fig. 17
f. Keep sufficient pressure on the drill to prevent
the bit turning out of the screw head. The
screw head can easily become damaged,
making it difficult to drive home or remove.
g. To stop the drill/driver, release the trigger
switch and allow the tool to come to a
complete stop.
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