Skil RH170201 Guide D'utilisation page 15

Drill Bits
Always inspect drill bits for excessive wear. Use only bits that are sharp and in good condition.
Twist Bits: Available with straight and reduced shanks for wood and light-duty metal drilling.
High-speed bits cut faster and last longer on hard materials.
Carbide-Tipped Bits: Used for drilling stone, concrete, plaster, cement, and other unusually
hard nonmetal materials. Use continuous, heavy feed pressure when using carbide-tipped bits.
Drilling
WARNING
dusty, also wear a dust mask.
a. Check that the direction-of-rotation selector is at 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 drill firmly, and place the bit at the point to be drilled.
d. Depress the trigger switch to start the drill.
e. Move the drill bit into the workpiece, applying only enough pressure to keep the bit "biting".
Do not force the 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. 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.
h. If the bit jams in the workpiece or if the drill stalls, stop the tool immediately. Remove the bit
from the workpiece and determine the reason for jamming.
NOTICE: There are two rules for drilling hard materials. First, the harder the material, the
greater the pressure you need to apply to the tool. Second, the harder the material, the slower
the speed should be. If the hole to be drilled is fairly large, drill a smaller hole first, and then
enlarge to the required size with a larger bit; it's often faster in the long run.
Always wear safety goggles or safety glasses with side shields
during power tool operation or when blowing dust. If the operation is
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