Milwaukee Tool 5262-21 User Manual

Page 7

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Using Rotary Percussion Core Bits

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, accurate 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.

2. Insert the adapter into the nose

of the tool as described in “In-

stalling 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.

NOTE: If a center pin and guide

plate are not available, use a template or notched

board to start the hole.

4. After drilling to about the depth of the core bit

teeth, remove the center pin and guide plate from

the core bit. Resume drilling.

5. To change the core bit, hold the tool upwards,

pointing it away from your body, and run it briefly

in forward to loosen the core bit from the adapter.

NOTE: To make holes deeper than 3", remove the

core bit, break and remove the core. Resume drilling.












Using the Control Switch

Always allow the motor to come to a complete stop

before using the control switch.


forward (clockwise) rotation, push the control

switch to the left side of the tool. Check the direction

of rotation before use.


reverse (counterclockwise) rotation, push the

control switch to the right side of the tool. Check

direction of rotation before use.

Starting, Stopping and Controlling Speed

1. To

start the tool, grasp the handle firmly and pull

the trigger.

2. To

vary the speed, increase or decrease the

pressure on the trigger. The further the trigger

is pulled, the greater the speed.

3. To

stop the tool, release the trigger. Make sure

the tool comes to a complete stop before laying

the tool down.


Position the tool, grasp the handles firmly and pull

the trigger. Always hold the tool securely using

both handles to maintain control. This tool has

been designed to achieve top performance with

only moderate pressure. Let the tool do the work.

If the speed begins to drop off when drilling large

or deep holes, pull the bit partially out of the hole

while the tool is running to help clear dust. Do not

use water to settle the dust since it will clog the bit

flutes and tend to make the bit bind in the hole. If

the bit should bind, a built-in, non-adjustable slip

clutch prevents the bit from turning. If this occurs,

stop the tool, free the bit and begin again.

Forward -

Push to


Reverse -

Push to