Kobalt KHD 524B-03 Mode D'emploi page 15

OPERATING INSTRUCTIONS
Masonry Drilling
a. For maximum performance, use carbide-tipped masonry bits when drilling holes in brick,
concrete, etc.
b. Set the mode selector (D) to hammer mode
c. Maintain a speed and pressure which will allow cutting without overheating the bit or the tool.
Applying too much pressure will:
– Overheat the tool.
– Wear the bearings.
– Bend or burn bits.
– Produce off-center or irregular-shaped holes.
d. Apply light pressure and medium speed for best results in brick.
e. Apply additional pressure for hard materials, such as concrete.
f. Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
14. Screw Driving
Try to use standard-type screws for easy driving and
improved grip.
a. Install the correct driver bit.
b. Set the mode selector (D) to driving mode
best performance
c. 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.
d. Use the correct speed range for the job and
initially apply minimal pressure to the variable-
speed trigger switch (E). Increase the speed only
when full control can be maintained.
e. 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.
f. Use a countersinking bit (sold separately) to accommodate the screw head, so that it does not
protrude from the surface.
g. 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.
h. To stop the hammer drill, release the variable-speed trigger switch and allow the tool to come
to a complete stop.
for best performance.
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