DeWalt DW972 Manual De Instrucciones página 29

Removing and fitting the chuck (fig. F & G)
• Open the chuck jaws as far as possible.
• Insert a screwdriver into the chuck and remove
the chuck retaining screw by turning clockwise
as shown in figure F.
• Tighten an Allen key into the chuck and strike it
with a hammer as shown in figure G. This will
loosen the chuck so that it can be unscrewed
by hand.
• To refit the chuck, proceed in reverse order.
Instructions for use
• Always observe the safety instructions
and applicable regulations.
• Be aware of the location of pipework and
wiring.
• Apply only a gentle pressure to the tool.
Excessive force does not speed up
drilling but decreases tool performance
and may shorten tool life.
• To minimise stalling on break-through,
progressively reduce the drill point
pressure towards the end of the
operation.
• Keep the motor running when pulling the
bit back out of a drilled hole. This will
help prevent jamming.
Prior to operation:
• Make sure your battery pack is (fully) charged.
• Insert the appropriate bit.
• Mark the spot where the hole is to be drilled.
• Select forward or reverse rotation.
Switching ON and OFF (fig. A & D)
• To run the tool, press the variable speed switch.
The pressure exerted on the variable speed
switch determines the tool speed.
• To stop the tool, release the switch.
• To lock the tool in OFF-position, move the
forward/reverse slider (2) to the central position.
The drill is equipped with a brake to stop
the tool as soon as the variable speed
switch is fully released.
24
Screwdriving (fig. A)
• Select forward or reverse rotation using the
slider (2).
• Set the collar (4) to position 1 and begin
screwdriving (low torque).
• If the clutch ratchets too soon, adjust the collar
to increase the torque as required.
Drilling (fig. A)
• Select the drilling mode using the collar (4).
Drilling in metal
• Use a cutting lubricant when drilling metals.
The exceptions are cast iron and brass which
should be drilled dry.
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 Auger bits.
• Use a block of wood to back up workpieces that
may splinter.
DW909/DW912/DW914/DW997 -
Percussion drilling
Drilling in masonry
• Use carbide-tipped masonry bits up to 10 mm ø
at high speed. Select low speed for larger ø bits.
Keep even force on the drill. A smooth, even flow
of dust indicates the proper drilling rate.
Consult your dealer for further information on the
appropriate accessories.
Maintenance
Your D WALT Power Tool has been designed to
E
operate over a long period of time with a minimum
of maintenance. Continuous satisfactory operation
depends upon proper tool care and regular cleaning.
Lubrication
Your Power Tool requires no additional lubrication.
E N G L I S H
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