DeWalt DW955 Manual De Instrucciones página 12

FIG. 5
Chuck Removal
Always wear eye protection.
Move the shifter to position 1. Tighten the chuck around the shorter end
of a hex key (not supplied) of 1/4" or greater size. Using a wooden
mallet or similar object, strike the longer end in the clockwise direction,
as shown in FIG. 5. This will loosen the screw inside the chuck.
Open chuck jaws fully, insert screwdriver (or Torx tool if required) into
front of chuck between jaws to engage screw head. Remove screw by
turning clockwise (left-hand-thread). Place hex key in chuck and
tighten, as shown in FIG. 5. Using a wooden mallet or similar object,
strike key sharply in the counterclockwise direction. This will loosen the
chuck so that it can be unscrewed by hand.
Chuck Installation
Screw the chuck on by hand as far as it will go and insert screw (LH
thread). Tighten screw securely. Tighten the chuck around the shorter
end of a 1/4" or larger hex key (not supplied) strike the longer end in the
clockwise direction with a wooden mallet, as shown in FIG. 5. Tighten
the screw once again by turning in a counterclockwise direction.
Operation as a Drill
Install and tighten the desired drill bit in the chuck. Select the desired
speed/torque range using the dual range gear shifter to match the
speed and torque to the planned operation. Follow these instructions for
best results when drilling.
DRILLING
1. Use sharp drill bits only. For WOOD, use twist drill bits, spade bits,
power auger bits, or hole saws. For METAL, use high speed steel
twist drill bits or hole saws.
2. Be sure the material to be drilled is anchored or clamped firmly. If
drilling thin material, use a "back-up" block to prevent damage to the
material.
3. 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.
4. Hold tool firmly to control the twisting action of the drill.
5. IF DRILL STALLS, it is usually because it is being overloaded.
RELEASE PADDLE IMMEDIATELY, remove drill bit from work, and
determine cause of stalling. DO NOT CLICK PADDLE OFF AND ON
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. Operate at full on after starting the bit.
Drilling in Wood
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 low speed wood bits. Work that is likely
to splinter should be backed up with a block of wood.
Drilling in Metals
Use a cutting lubricant when drilling metals. The exceptions are cast
iron and brass which should be drilled dry. The cutting lubricants that
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