DeWalt DCH172 Manual De Instrucciones página 8

English
vibration control. Applying too much pressure will not
make the tool drill faster and active vibration control will
not engage.
SDS plus® Chuck (Fig. H)

WARNING: Burn hazard. ALWAYS wear gloves when
changing bits. Accessible metal parts on the tool and bits
may get extremely hot during operation. Small bits of broken
material may damage bare hands.
To insert bit, insert shank of bit about 3/4" (19 mm) into
chuck 14 . Push and rotate bit until it locks in place. The bit
will be securely held.
To release bit, pull the sleeve
Drilling (Fig. G)

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. Push the mode selector lever
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.

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.
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.
8
15 back and remove the bit.
5 to the drill symbol
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. G)
1. Push the mode selector lever
16 .
hammer symbol
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.
MAINTENANCE

WARNING: To reduce the risk of serious personal
injury, turn unit off and remove the battery pack
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
e
over a long period of time with a minimum of maintenance.
Continuous satisfactory operation depends upon proper
tool care and regular cleaning.
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 when
performing this procedure.

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.
Accessories

WARNING: Since accessories, other than those offered by
D WALT, have not been tested with this product, use of such
e
accessories with this product could be hazardous. To reduce
to the drill bit and
5
17 .