Manual DeWalt D21720 T 4 (page 29 of 124) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Spanish, Norwegian)

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ENGLISH

• Apply only a gentle pressure to the tool.

Excessive force does not speed up

drilling but decreases tool performance

and may shorten tool life.

Proper Hand Position (ﬁ g. A, D)

WARNING: To reduce the risk of serious

personal injury, ALWAYS use proper

hand position as shown. .

WARNING: To reduce the risk of serious

personal injury, ALWAYS hold securely in

anticipation of a sudden reaction.

Proper hand position requires one hand on the side

handle (6), with the other hand on the main handle

(12).

Switching On and Off (ﬁ g. A)

• To run the tool, press the variable speed switch.

The pressure exerted on the variable speed

switch determines the tool speed.

Screwdriving

• Select forward or reverse rotation.

• Use the low speed/high torque position

(1st gear).

Percussion Drilling (ﬁ g. A)

• Select the percussion mode.

• Press the switch (1).

• If necessary, press the lock-on button (2) for

continuous operation and release the switch.

The lock-on button works only in full speed,

forward rotation.

• To stop the tool, release the switch.

• To stop the tool in continuous operation, press

the switch brieﬂ y and release it. Always switch

OFF the tool when work is ﬁ nished and before

unplugging.

Rotary Drilling (ﬁ g. A)

• Select the rotary drilling mode.

• Proceed as described for percussion drilling.

Drilling

WARNING: To reduce the risk

of serious personal injury, turn

tool off and disconnect tool from

power source before making any

adjustments or removing/installing

attachments or accessories.

WARNING: To reduce the risk of

personal injury, ALWAYS ensure

workpiece is anchored or clamped firmly.

If drilling thin material, use a wood “back-

up” block to prevent damage to the

material.

1. Use sharp drill bits only. For WOOD, use the

low speed setting and twist drill bits, spade bits,

power auger bits, or hole saws. For METAL, use

the low speed setting and steel twist drill bits or

hole saws.

2. 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.

3. Hold tool firmly with both hands to control the

twisting action of the drill.

CAUTION: 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.

4. 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 ON AND OFF IN AN

ATTEMPT TO START A STALLED DRILL —

THIS CAN DAMAGE THE DRILL.

5. To minimize stalling or breaking through the

material, reduce pressure on drill and ease the bit

through the last fractional part of the hole.

6. Keep the motor running when pulling the bit

back out of a drilled hole. This will help prevent

jamming.

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.

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DeWalt D21720 T 4 Manual

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