DeWalt D25413 Guide D'utilisation page 11

Drilling
(ONLY FOR D25413 & D25416)
1. Always unplug the drill when attaching or changing bits or
accessories.
2. Always use sharp drill bits. For WOOD, use twist drill bits, spade
bits, power auger bits, or hole saws. For METAL, use steel twist
drill bits or hole saws. For MASONRY, such as brick, cement,
cinder block, etc., use carbide-tipped bits rated for percussion
drilling.
3. Be sure the material to be drilled is anchored or clamped firmly.
If drilling thin material, use a wood "back-up" block to prevent
damage to the material.
4. Always apply pressure in a straight line with the bit. Use enough
pressure to keep drill biting, but do not push hard enough to stall
the motor or deflect the bit.
5. Hold tool firmly to control the twisting action of the drill.
WARNING: Drill may stall if overloaded causing a sudden twist.
Always expect the stall. Grip the drill firmly with both hands to
control the twisting action and avoid injury.
6. IF DRILL STALLS, it is usually because it is being overloaded or
improperly used. RELEASE TRIGGER IMMEDIATELY, remove
drill bit from work, and determine cause of stalling. DO NOT
CLICK TRIGGER ON AND OFF IN AN AT TEMPT TO START A
STALLED DRILL — THIS CAN DAMAGE THE DRILL.
7. To minimize stalling or breaking through the material, reduce
pressure on drill and ease the bit through the last fractional part
of the hole.
8. Keep the motor running when pulling the bit back out of a drilled
hole. This will help prevent jamming.
9. With variable speed drills there is no need to center punch
the point to be drilled. Use a slow speed to start the hole and
accelerate by squeezing the trigger harder when the hole is deep
enough to drill without the bit skipping out.
DRILLING IN METAL
Start drilling with slow speed and increase to full power while applying
firm pressure on the tool. A smooth even flow of metal chips indicates
the proper drilling rate. Use a cutting lubricant when drilling metals.
The exceptions are cast iron and brass which should be drilled dry.
NOTE: Large [5/16" to 1/2" (7,6 mm to 13 mm)] holes in steel can
be made easier if a pilot hole [5/32" to 3/16" (3,8 mm to 5 mm] is
drilled first.
DRILLING IN WOOD
Start drilling with slow speed and increase to full power while applying
firm pressure on the tool. Holes in wood can be made with the same
twist drills used for metal. These bits may overheat unless pulled out
frequently to clear chips from the flutes. For larger holes, use spade
bits, power auger bits, or hole saws. Work that is apt to splinter
should be backed up with a block of wood.
DRILLING IN MASONRY
When drilling in masonry, use carbide tipped bits rated for percussion
drilling and be certain that the bit is sharp. Use a constant and firm
force on the tool to drill most effectively. A smooth, even flow of dust
indicates the proper drilling rate.
HAMMERDRILL OPERATION
1. When drilling, use just enough force on the hammer to keep it
from bouncing excessively or "rising" off the bit. Too much force
will cause slower drilling speeds, overheating, and a lower drilling
rate.
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