-16-
DRILLING MASONRY
(HAMMER DRILLING MODE)
For maximum performance, use carbide-tipped
masonry bits when drilling holes in brick,
concrete, etc. and set the mode selector to the
hammer drilling mode .
a. Maintain a speed and a pressure that allow
cutting without overheating the bit or drill.
Applying too much pressure will:
–
Overheat the tool.
–
Wear the bearings.
–
Bend or burn bits.
–
Produce off-center or irregular-shaped holes.
b. Apply light pressure and medium speed for
best results in brick.
c. Apply additional pressure for hard materials,
such as concrete.
d. Begin drilling at a very low speed to prevent
the bit from slipping off the starting point.
USING KEYLESS 3-JAW CHUCK
(FIG. 15)
The keyless 3-jaw chuck lets you use a variety
of straight shank bits with this tool.
NOTICE:
The tool must be set to the Rotary Drilling
mode when using the 3-jaw chuck! Using the tool in
Hammering mode can cause damage to the 3-jaw
chuck and may cause bits to become loose and
cause damage or injury.
a. Disconnect the battery pack and lock the
trigger switch “OFF” on the tool by placing
the direction-of-rotation selector in the center
position.
b. Attach the keyless 3-jaw chuck as described
in “CHANGING THE DETACHABLE CHUCK”
chapter earlier.
c. Turn the sleeve of the 3-jaw chuck to open
the jaws on the chuck wide enough to fit a drill
bit.
d. For small bits – insert the bit up to the flutes.
For large bits – insert the bit as far as it will
go.
e. Securely lock the bit in place by tightening the
chuck sleeve.
f. Set the mode selector to rotary drilling!
g. Attach the battery pack and start drilling.
c
e
d
Fig. 15
