Maintenance - DeWalt dwd112 Original Instructions Manual

7. 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
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.
NOTE: Large [5/16" (8 mm) to 1/2" (13 mm)] holes
in steel can be made easier if a pilot hole [5/32"
(4 mm) to 3/16" (5 mm)] is drilled first.
DRILLING IN WOOD
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.
Work that is apt to splinter should be backed up
with a block of wood.
Keyless Chuck – DWD112S (fi g. 4–6)
The DWD112S feature a keyless chuck (d) for
greater convenience. To insert a drill bit or other
accessory, follow the steps listed below.
1. Grasp the rear half of the chuck with one hand
and use your other hand to rotate the front half
counterclockwise, as shown in Figure 4. Rotate
far enough so that the chuck opens sufficiently
to accept the desired accessory.
2. Insert the bit or other accessory about 3/4"
(19 mm) into the chuck and tighten securely
by holding the rear half of the chuck and
rotating the front portion in the clockwise
direction. When the chuck is nearly tightened,
you will hear a clicking sound. After 4–6 clicks,
the chuck is securely tightened around the
accessory.
3. To release the accessory, repeat step 1 listed
above.
WARNING: Do not attempt to tighten
drill bits (or any other accessory) by
gripping the front part of the chuck
and turning the tool on. Damage to the
chuck and personal injury may result.
KEYLESS CHUCK REMOVAL (FIG. 5)
Tighten the chuck around the shorter end of a hex
key (not supplied) of 1/4" (6 mm) or greater size.
Using a soft hammer or piece of wood, strike the
longer end in the counterclockwise direction. This
will loosen the chuck so that it can be unscrewed
by hand.
KEYLESS CHUCK INSTALLATION (FIG. 6)
Screw the chuck on by hand as far as it will go.
Tighten the chuck around the shorter end of a 1/4"
(6 mm) or larger hex key (not supplied) strike the
longer end in the clockwise direction with a soft
hammer.
Keyed Chuck – DWD112 (fi g. 7, 8)
The DWD112 features a keyed chuck (d). To insert
a drill bit or other accessory, follow the steps listed
below.
1. Open the chuck jaws by turning collar by hand
and insert the shank of the bit about 3/4"
(19 mm) into chuck. Tighten the chuck collar by
hand.
2. Place chuck key in each of the three holes, and
tighten in clockwise direction. It's important to
tighten chuck with all three holes.
To release the bit, turn the chuck counterclockwise
in just one hole, then loosen the chuck by hand.
REMOVAL OF KEYED CHUCK (FIG. 7)
Tighten the chuck around the shorter end of a hex
key (not supplied) of 1/4" (6 mm) or greater size.
Using a soft hammer, strike the key sharply in the
counterclockwise direction when viewed from the
front of the tool. This will loosen the chuck so that it
can be removed by hand.
KEYED CHUCK INSTALLATION (FIG. 8)
Screw the chuck on by hand as far as it will go.
Insert the shorter end of a hex key (not supplied)
of 1/4" (6 mm) or greater size and strike it in the
clockwise direction with a soft hammer.

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.
WARNING: To reduce the risk of
injury, turn unit off and disconnect
machine from power source before
installing and removing accessories,
before adjusting or changing set-
ups or when making repairs. Be sure
the trigger switch is in the OFF position.
An accidental start-up can cause injury.
EN GL IS H
7