Drilling In Metal; Drilling In Wood - DeWalt DW116 Instruction Manual

158865/JAN95 5/20/02 3:47 PM
4. 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.
5. Hold tool firmly to control the twisting action of the drill.
6. 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.
7. To minimize stalling or breaking through the material, reduce
pressure on drill and ease the bit through the last fractional
part of the hole.
8. Keep the motor running when pulling the bit back out of a
drilled hole. This will help prevent jamming.
9. 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.
Keyless Chuck
Your tool features a keyless chuck for greater convenience. To
insert a drill bit or other accessory, follow the steps listed below.
1. Unplug the drill.
2. 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 3. Rotate far enough so that the chuck opens sufficiently
to accept the desired accessory.
3. Insert the bit or other accessory about 3/4" into the chuck and
tighten securely by holding the rear half of the chuck and
rotating the front portion in the clockwise direction.
To release the accessory, repeat step 2 listed above.
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FIG. 3
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.

Drilling in Metal

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 sulfurized cutting oil or lard oil;
bacon-grease will also serve the purpose.

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 Power Drill Wood Bits. Work
that is apt to splinter should be backed up with a block of wood.
Drilling in Masonry
Use carbide tipped masonry bits at low speeds. Keep even force
on the drill but not so much that you crack the brittle materials. A
smooth, even flow of dust indicates the proper drilling rate.