7
1. Clean and lubricate the threads on the adapter
and core bit to make later removal easier. Screw
the threaded end of the adapter into the rear of
the core bit.
2. Push the guide plate onto the pointed end of the
center pin. Insert the center pin and guide plate
assembly into the core bit. Be sure the small end
of the center pin is securely placed into the hole
in the center of the core bit (Fig. 5).
Fig. 5
3. Insert the adapter into the nose of the tool. Set
the action selector to the hammering with rotation
setting.
4. Press the center pin firmly against your center
mark, hold the tool firmly and pull the trigger.
NOTE:
If a center pin and guide plate are not
available, use a template or notched board to
start the hole (Fig. 6).
Fig. 6
Drilling Large Diameter Holes with Core Bits
When drilling holes with large diameter core bits,
dust may build up in the cut and can cause the tool
to stall, bind, or cut slowly. By creating an opening
for the dust to escape, drilling time, bit stress, and
tool stress can be reduced.
1. Start the cut as normal.
2.Once the bit is firmly
established in the cut
(about 1/4" deep), re-
move the bit from the
cut (Fig. 7).
3. Remove the bit from the
tool.
4. Install a standard fluted
bit, approximately 7/8" in
diameter, onto the tool.
5. Drill a perpendicular hole
through the kerf of the
large hole (Fig. 8).
• Depending on the loca-
tion of the work, the
hole should either break
through the other side of
the hole/floor or extend
4"-5" past the end of the
workpiece (such as into
the dirt below a concrete
slab).
• If dust builds up in the
hole, vacuum it out and
continue drilling.
• If drilling through a wall,
the hole for dust should
be drilled on the lowest
part of the large hole
kerf (Fig. 9) as the dust
will fall there when drill-
ing and can be evacu-
ated more easily.
6. Reinstall the core bit
and continue drilling
(Fig. 9 & 10). Dust and
debris will fall through
the hole and optimize
the cutting ability of the
bit.
NOTE
: If unable to drill
a hole in the kerf, pull
back on the bit with the
hammer running (Fig. 11).
This will remove some of
the dust and debris from
the cut. Repeat this for
every inch of drilling. If
necessary, vacuum dust
and debris from the cut
and surrounding area.
Fig. 7
Cut approximately
1/4" deep with a
core bit.
Fig. 10
Side view
of slab
Fig. 11
Pull bit out as far as
possible once or twice
per inch drilled.
Fig. 8
Drill a hole
through the work.
Fig. 9
Dust and debris
will fall through
the hole.
Top view
5. After drilling to about the depth of the core bit
teeth, remove the center pin and guide plate
from the core bit. Resume drilling.
6. To change the core bit, hold the tool upwards,
pointing it away from your body, and run the tool
allowing rotation and impacting for about five
seconds to loosen the core bit from the adapter
shank.
NOTE:
To make deeper holes, remove the core
bit, break and remove the core. Resume drilling.
When drilling long or deep holes, after each inch
of penetration pull the bit partially out of the hole
while the tool is running, to help clear dust from
the bit flutes. Dust can clog the bit flutes and can
make the bit bind in the hole. If this occurs, stop
the tool, free the bit and begin again.
