Hammerdrill Operation; Maintenance - DeWalt D25052 Original Instructions Manual

EN GLI SH
WARNING: To reduce the risk of
personal injury, ALWAYS ensure
workpiece is anchored or clamped
firmly. If drilling thin material, use a wood
"back-up" block to prevent damage to
the material.
WARNING: To reduce the risk of
personal injury, ALWAYS operate
the tool with the side handle properly
installed and securely tightened. Failure
to do so may result in the side handle
slipping during tool operation and
subsequent loss of control. Hold tool
with both hands to maximize control.
Rotate the mode selection collar (f) to the drill bit
symbol for drilling or to the hammerdrill symbol for
hammerdrilling.
DRILLING OPERATION
1. For WOOD, use twist bits, spade bits, power
auger bits or hole saws. For METAL, use high-
speed steel twist drill bits or hole saws. Use
a cutting lubricant when drilling metals. The
exceptions are cast iron and brass which should
be drilled dry. For MASONRY, use carbide-
tipped bits or masonry bits. A smooth, even
flow of dust indicates the proper drilling rate.
2. Always apply pressure in a straight line with the
bit. Use enough pressure to keep the drill bit
biting, but do not push hard enough to stall the
motor or deflect the bit.
3. Hold tool firmly with both hands 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.
4. IF DRILL STALLS, it is usually because it
is being overloaded. RELEASE TRIGGER
IMMEDIATELY, remove drill bit from work,
and determine cause of stalling. DO NOT
CLICK TRIGGER OFF AND ON IN AN
ATTEMPT TO START A STALLED DRILL –
THIS CAN DAMAGE THE DRILL.
5. To minimise stalling or breaking through the
material, reduce pressure on drill and ease the
bit through the last fractional part of the hole.
6. Keep the motor running when pulling the bit
back out of a drilled hole. This will help prevent
jamming.
8
7. 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
®
An SDS Plus to round shank adapter chuck is
required. Ensure that tool is in drill-only mode. 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 [7.9 mm to 12.7 mm (5/16" to 1/2")]
holes in steel can be made easier if a pilot hole
[4 mm to 4.8 mm (5/32" to 3/16")] is drilled first.
DRILLING IN WOOD
An SDS Plus ® to round shank adapter chuck is
required. Ensure that tool is in drill-only mode. 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.

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.
2. Drill straight, keeping the bit at a right angle to
the work. Do not exert side pressure on the bit
when drilling as this will cause clogging of the
bit flutes and a slower drilling speed.
3. When drilling deep holes, if the hammer speed
starts to drop off, pull the bit partially out of
the hole with the tool still running to help clear
debris from the hole.
4. For masonry, use carbide-tipped bits or
masonry bits. A smooth even flow of dust
indicates the proper drilling rate.

MAINTENANCE

Your D WALT power tool has been designed to
E
operate over a long period of time with a minimum
of maintenance. Continuous satisfactory operation
depends upon proper tool care and regular cleaning.