DeWalt DCH253-XE, Instruction Manual

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11
Replacing the SDS Plus
®
Tool Holder with the Keyless Chuck
(Fig. 10)
DCH254 ONLY
1. Turn the locking collar (N) into the
unlocked position and pull the SDS Plus ®
tool holder (O) off.
2. Push the keyless chuck (P) onto the
spindle and turn the locking collar into
the locking position.
3. To replace the keyless chuck with the
SDS Plus ® tool holder, repeat the method
in steps 1 and 2.
WARNING: Never use standard chucks in
the rotary hammering mode.
Drilling (Fig. 3)
WARNING: To reduce the risk of personal injury, ALWAYS operate the tool with the
side handle properly installed. 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.
NOTICE: If drilling thin material, use a wood “back-up” block to prevent damage to the
material.
1. Turn the mode selector (D) to the drill symbol (I).
2. Use sharp drill bits only. 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, such as brick, cement, cinder block,
etc., use carbide-tipped bits rated for percussion drilling.
3. 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.
4. Hold tool firmly with both hands to control the twisting action of the drill. If model
is not equipped with side handle, grip drill with one hand on the handle and one hand
on the battery pack.
FIG. 10
N
O
P
N
WARNING: Drill may stall if overloaded causing a sudden twist. Always expect the
stall. Grip the drill firmly to control the twisting action and avoid injury.
5.
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 DEPRESS TRIGGER ON AND OFF IN AN ATTEMPT TO
START A STALLED DRILL — THIS CAN DAMAGE THE DRILL.
6. To minimize stalling or breaking through the material, reduce pressure on drill and
ease the bit through the last fractional part of the hole.
7. Keep the motor running when pulling the bit back out of a drilled hole. This will
help prevent jamming.
8. 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 for the DCH253-XE. Replace
the SDS Plus ® tool holder with the keyless chuck (DCH254-XE). 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 adaptor chuck is required for the DCH253-XE. Replace
the SDS Plus ® tool holder with the keyless chuck (DCH254-XE). 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.
DRILLING IN MASONRY
When drilling in masonry, use carbide-tipped bits rated for percussion drilling and be
certain that the bits are 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.