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Using Rotary Percussion Core Bits (Fig. 5 - 8)
Core bits are useful for drilling larger holes for conduit and pipe.
MILWAUKEE Thin Wall Core Bits have heat-treated steel bodies with
durable carbide tips. These core bits are specially designed for fast, ac-
curate drilling with combined hammering and rotary action.
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.
NOTE: For core bits 1- 1/4" and larger, 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
2.
Insert the adapter into the nose of the tool as described in "Installing
Bits". Set the hammer/drill shift knob to hammering with rotation.
3.
Press the center pin firmly against your center mark, hold the tool
firmly and pull the trigger (Fig. 6).
Fig. 6
page 8
NOTE: If a center pin and guide plate are not available, use a tem-
plate 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 as shown, and run it briefly in forward to loosen the core
bit from the adapter (Fig. 8).
Fig. 8
NOTE: To make holes deeper than 3", remove the core bit, break and
remove the core. Resume drilling.
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