DeWalt D25124 Instruction Manual page 32

5. To minimize 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.
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 adaptor 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 [5/16" to 1/2" (7.9 mm to 12.7 mm)] holes in steel can
be made easier if a pilot hole [5/32" to 3/16" (4 mm to 4.8 mm)] is
drilled first.
DRILLING IN WOOD
An SDS Plus ® to round shank adaptor 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.
Chipping and Chiselling
1. To switch from hammer drilling to chiselling, first insert the SDS-
plus ® chisel and check if it is properly locked.
2. When switching from hammer drilling mode to chiselling mode,
turn the chisel to the desired position. If you find resistance during
mode change, turn the chisel slightly to engage the spindle lock.
Depth Rod (Fig. 1)
TO ADJUST THE DEPTH ROD
1. Push in and hold the depth rod release button on the side handle.
2. Move the depth rod (B) so the distance between the end of the
rod and the end of the bit equals the desired drilling depth.
3. Release the button to lock rod into position. When drilling with
the depth rod, stop when end of rod reaches surface of material.
MAINTENANCE
WARNING: To reduce the risk of injury, turn unit off and
disconnect tool from power source before installing and
removing accessories, before making any adjustments or
removing/installing attachments or accessories. An accidental
start-up can cause injury.
Your D WALT power tool has been designed to operate over a
E
long period of time with a minimum of maintenance. Continuous
satisfactory operation depends upon proper tool care and regular
cleaning.
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