DeWalt DCH253 Guide D'utilisation page 17

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.
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.
HAMMERDRILL OPERATION (FIG. 4)
1. Turn the mode selector (D) to the rotary hammer symbol (K).
2. 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.
3. 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.
4. 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.
5. For masonry, use carbide-tipped bits or masonry bits. A smooth
even flow of dust indicates the proper drilling rate.
Chipping and Chiselling (Fig. 4)
1. Set the mode selector switch (D) to the chipping symbol (L).
2. Insert the appropriate chisel and rotate it by hand to lock it into one
of 51 positions.
3. Adjust the side handle (A) as required.
4. Switch on the tool and start working.
5. Always switch off the tool when work is finished and
before unplugging.
MAINTENANCE
WARNING: To reduce the risk of serious personal injury, turn
tool off and disconnect tool from power source before making
any adjustments or removing/installing attachments or
accessories. An accidental start-up can cause injury.
Cleaning
WARNING: Blow dirt and dust out of all air vents with clean, dry
air at least once a week. To minimize the risk of eye injury, always
wear ANSI Z87.1 approved eye protection and proper NIOSH/
OSHA/MSHA respiratory protection when performing this.
WARNING: Never use solvents or other harsh chemicals for
cleaning the non-metallic parts of the tool. These chemicals may
weaken the plastic materials used in these parts. Use a cloth
dampened only with water and mild soap. Never let any liquid get
inside the tool; never immerse any part of the tool into a liquid.
CHARGER CLEANING INSTRUCTIONS
WARNING: Shock hazard. Disconnect the charger from the AC
outlet before cleaning. Dirt and grease may be removed from the
exterior of the charger using a cloth or soft non-metallic brush. Do not
use water or any cleaning solutions.
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