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page 9
4. Press the center pin fi rmly against your center mark, hold the tool fi rmly
and pull the trigger (Fig. 6).
Fig. 6
NOTE: If a center pin and guide plate are not available, use a template
or notched board to start the hole (Fig. 7).
Fig. 7
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
fi ve 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 fl utes. Dust can clog the bit fl utes
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 (Fig. 8-13)
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 open-
ing 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 fi rmly established in the cut (about 1/4" deep), remove
the bit from the cut (Fig. 8).
3. Remove the bit from the tool.
4. Install a standard fl uted bit, approximately 7/8" in diameter, onto the
tool.
5. Drill a perpendicular hole through the kerf of the large hole (Fig. 9).
• Depending on the location of the work, the hole should either break
through the other side of the hole/fl oor 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 drilling
and can be evacuated more easily.
Fig. 8
Cut approximately
1/4" deep with a core
bit.
Fig. 9
Drill a hole through
the work.
6. Reinstall the core bit and continue drilling (Fig. 10 & 11). Dust and debris
will fall through the hole and optimize the cutting ability of the bit.
Fig. 10
Dust and debris
will fall through
the hole.
Fig. 11
Top view
Side view
of slab