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BRACING FOR REVERSE ROTATION
When drilling in reverse, the bit will rotate in a
counterclockwise direction (A). If the bit binds
in the hole, the bit will come to a sudden stop
and the drill will suddenly react in a clockwise
direction (B).
The motor housing braced (C) against a stud
will hold the drill in position.
DRILLING (FIG. 17)
WARNING
with side shields during power tool
operation or when blowing dust. If operation
is dusty, also wear a dust mask.
a. Check that the direction-of-rotation selector is
at the correct setting (forward or reverse).
b. Secure the material to be drilled in a vise or
with clamps to keep it from turning as the drill
bit rotates.
c. Hold the angle drill firmly with both hands.
One hand on the main handle and the other
on the front handle or auxiliary handle.
d. Place the bit at the point to be drilled. Depress
the variable-speed trigger switch to start the
drill.
e. Move the drill bit into the workpiece, applying
only enough pressure to keep the bit "biting".
Do not force the drill or apply side pressure to
elongate a hole. Let the tool do the work.
f. When drilling hard, smooth surfaces, use a
center punch to mark the desired location of
the hole. This will prevent the drill bit from
slipping off-center as the hole is started.
g. When drilling metals, use light oil on the drill
bit to keep it from overheating. The oil will
prolong the life of the bit and increase the
drilling efficiency.
(FIG. 16)
Always wear safety
goggles or safety glasses
Fig. 16
Fig. 17
h. If the bit jams in the workpiece or if the drill
stalls, stop the tool immediately. Remove the
bit from the workpiece and determine the
reason for jamming.
There are two rules for drilling hard materials.
First, the harder the material, the greater the
pressure you need to apply to the tool. Second,
the harder the material, the slower the speed
should be. If the hole to be drilled is large, drill
a smaller hole first, and then enlarge to the
required size with a larger bit; it's often faster in
the long run.
-18-
C
B
A
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