DeWalt DW999 Manual De Instrucciones página 9

FIG. 4
C
NOTE: Continuous use in variable speed range is not recommended.
It may damage the switch and should be avoided.
Forward/Reverse Control Button (3-C)
A forward/reverse control button determines the direction and also
serves as a lock off button. To select forward rotation, release the
trigger switch and depress the forward/reverse control button on the
right side of the tool.To select reverse, depress the forward/reverse
control button on the left side of the tool. The center position of the
control button locks the tool in the off position. When changing the
position of the control button, be sure the trigger is released. NOTE:
The first time the tool is run after changing the direction of rotation,
you may hear a click on start up. This is normal and does not indicate
a problem.
SDS Chuck (Fig. 3-D)
To insert bit, insert shank of bit about 3/4" into chuck. Push and rotate
bit until it locks into place. The bit will be securely held.
To release bit, pull the collar back and remove the bit.
Hammer/Drill Selector (Fig. 4)
To switch the tool from the drilling mode to the hammering mode (or
vice-versa) rotate the dial (A) to the applicable symbol shown. For
straight drilling, align the dial with the drill bit symbol (B) as shown. For
hammering, align the dial with the hammer symbol (C). NOTE: The
selector must be in either drill, or hammer/drill mode at all times. There
are no operable positions between the two.
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B
A
8
Operation
DRILLING
1. Always unplug the drill when attaching or changing bits or
accessories.
2. Be sure the material to be drilled is anchored or clamped firmly. If
drilling thin material, use a wood "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 drill 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 or
improperly used. RELEASE TRIGGER IMMEDIATELY, remove drill
bit from work, and determine cause of stalling. DO NOT CLICK
TRIGGER 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.
DRILLING IN METAL
An 'SDS shank to round shank' adapter chuck is required. Ensure
that tool is in rotation 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. The cutting lubricants that work best are
sulphurized cutting oil or lard oil; bacon-grease will also serve the
purpose.