Kobalt KHD 524B-03 Mode D'emploi page 14

OPERATING INSTRUCTIONS
13. Drilling
WARNING
• Always wear safety goggles or safety glasses with
side shields during power tool operation or when
blowing dust. If operation is dusty, also wear a dust
mask.
a. Check the direction-of-rotation selector (F) for the
correct setting (forward or reverse).
b. Secure the material to be drilled in a vise or with
clamps to keep it from turning as the drill bit
rotates.
c. Hold the hammer drill firmly and place the bit at
the point to be drilled.
d. Depress the variable-speed trigger switch (E) to
start the hammer drill.
e. Move the drill bit into the workpiece, applying only enough pressure to keep the bit drilling. Do
not force the hammer drill or apply side pressure to elongate a hole. Let the tool do the work.
f. When drilling hard, smooth surfaces, use a center punch to mark the desired location of the
hole. This will prevent the drill bit from slipping off center as the hole is started.
g. If the bit jams in the workpiece or if the hammer drill stalls, stop the tool immediately. Remove
the bit from the workpiece and determine the reason for jamming.
h. To stop the hammer drill, release the variable-speed trigger switch and allow the tool to come
to a complete stop.
Wood Drilling
a. For maximum performance, use high-speed steel or brad-point bits for drilling wood.
b. Set the mode selector (D) to drilling mode
c. Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
d. Increase speed as the drill bit bites into the material.
e. When drilling "through" holes, place a block of wood behind the workpiece to prevent ragged
or splintered edges on the back side of the hole.
Metal Drilling
a. For maximum performance, use high-speed steel bits for drilling metal or steel.
b. Set the mode selector (D) to drilling mode
c. When drilling metals, use light oil on the drill bit to keep it from overheating. The oil will prolong
the life of the bit and increase the drilling action.
d. Begin drilling at a very low speed to prevent the bit from slipping off the starting point.
e. Maintain a speed and pressure which will allow cutting without overheating the bit. Applying
too much pressure will:
– Overheat the tool.
– Wear the bearings.
– Bend or burn bits.
– Produce off-center or irregular-shaped holes.
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for best performance.
for best performance.
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