16
OPERATION
SELEcTING A DRILLING MODE
See Figure 14
.
To adjust for type of drilling, slide the mode selector on
the side of the motor housing to hammer mode, screw
mode, or drilling mode.
Select screw mode for driving screws. Screw mode oper-
ates with user adjusted torque. (See
Adjustable Torque
clutch.)
Drill mode is for full torque operations only and bypasses
the clutch setting. Select drill mode when drilling with
twist drills, hole saws, etc., in soft materials, or when the
application calls for full torque of the drill.
Select hammer mode for masonry, brick, tile, and con-
crete. For maximum performance, use carbide-tipped
impact masonry bits.
To use the hammer mode:
Rotate the mode selector to the hammer mode.
Apply light pressure and medium speed for best re-
sults in brick.
Apply additional pressure and high speed for hard
materials such as concrete.
When drilling holes in tile, practice on a scrap piece to
determine the best speed and pressure.
NOTE: The hammer drill has not been designed for re-
verse hammering.
DRILLING
See Figures 15 - 16.
Levels are located on the top and end of the motor hous-
ing to help keep the drill bit level during use.
Check the direction of rotation selector for the correct
setting (forward or reverse).
Secure the material to be drilled in a vise or with
clamps to keep it from turning as the drill bit rotates.
Hold the drill firmly and place the bit at the point to be
drilled.
Depress the switch trigger to start the drill.
Move the drill bit into the workpiece, applying only
enough pressure to keep the bit cutting. Do not force
the drill or apply side pressure to elongate a hole. Let
the tool do the work.
WARNING:
Be prepared for binding at bit break-
through. When these situations occur, drill has a
tendency to grab and kick opposite to the direction
of rotation and could cause loss of control when
breaking through material. If not prepared, this loss
of control can result in possible serious injury.
When drilling hard, smooth surfaces, use a center
punch to mark the desired hole location. This will pre-
vent the drill bit from slipping off-center as the hole is
started.
When drilling metals, use a light oil on the drill bit to
keep it from overheating. The oil will prolong the life of
the bit and increase the drilling action.
Fig. 14
®
6
Fig. 15
LEVEL
TO DECREASE
TORQUE
HAMMER MODE
DRILL MODE
TO INCREASE
TORQUE
MODE
SELECTOR
SCREW MODE
TORQUE
ADJUSTING RING
