Instruction manual

ManualsBrandsDeWalt ManualsPower ToolsDW999

English

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.

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.

FIG. 4