8
3. Insert the adapter into the nose of the tool (see
“Installing Bits and Chisels”. 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 trig
-
ger.
NOTE:
If a center pin
and guide plate are not
available, use a template
or notched board to start
the hole.
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 rota-
tion and impacting for
about five seconds
to loosen the core
bit from the adapter
shank.
NOTE:
To make deep-
er 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.
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.
Cut approximately
1/4" deep with a
core bit.
Drill a hole
through the
work.
Dust and debris will fall
through the hole.
Top view
Side view
of slab
2. Once the bit is firmly
established in the cut
(about 1/4" deep), re
-
move the bit from the
cut.
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.
• Depending on the lo-
cation of the work,
the hole should ei-
ther 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 as the
dust will fall there
when drilling and can
be evacuated more
easily.
6. Reinstall the core bit
and continue drilling.
Dust and debris will fall
through the hole and
optimize the cutting
ability of the bit.
7. For core bits, once
the maximum core bit
depth is drilled, the
core must be broken
and removed.
• Install a chisel bit.
• Place the chisel into
the hole kerf.
• Chisel down into the
kerf at several points
until the core is loose
or broken.
• Remove the core and
vacuum/remove any remaining dust and debris.
• Install the core bit and continue the cut.
NOTE
: If unable to drill a
Pull bit out as far as
possible once or twice
per inch drilled.
hole in the kerf, pull back
on the bit with the hammer
running. This will remove
some of the dust and de-
bris from the cut. Repeat
this for every inch of drill-
ing. If necessary, vacuum
dust and debris from the
cut and surrounding area.
