Milwaukee 4096 Operator's Manual download pdf (Page 12)

Sharpening Procedure for Core Bits

To work efﬁ ciently, diamond core bits must main-

tain good diamond exposure. Many factors work

together to provide the "controlled erosion" cycle of

the tool's segment to occur. When this "controlled

erosion" cycle is altered, the bit can become dull

or "glazed." Glazing becomes noticeable when

the coring feed rate slows dramatically or the bit

does not cut. Examine the bit immediately. If the

diamonds are ﬂ ush with the metal, they are under-

exposed or "glazed."

The following steps will often correct the problem:

1. Reduce water ﬂ ow until it becomes very muddy.

Continue using as little water as possible until

penetration increases.

2. If the bit does not open up, remove from hole.

Pour into the kerf a thick (1/4") layer of silica sand

(the coarser the better).

3. Resume drilling for approximately 3 to 5 minutes

with very little water and at a lower RPM if pos-

sible.

4. Gradually increase water ﬂ ow to ﬂ ush sand from

kerf.

5. Repeat as needed.

The Effects of Steel in Coring

• To self-sharpen, diamond-impregnated core bits

require interaction with an abrasive material. This

abrasive material wears away the metal composi-

tion in the segment's matrix. As this is done, sharp

diamonds are exposed and the grinding action

created by the diamonds continues.

• Embedded metal (rebar) is not an abrasive mate-

rial. It does not provide the degree of abrasiveness

required for matrix wear to occur and expose sharp

diamonds embedded in the segment's matrix.

• A high degree of exposure to embedded metal

by the bit's segments creates glazing. Glazing

prevents the bit from cutting and coring.

ACCESSORIES

For a complete listing of accessories refer to your

MILWAUKEE Electric Tool catalog or go on-line

to www.milwaukeetool.com. To obtain a catalog,

contact your local distributor or a service center.

WARNING To reduce the risk of injury,

always unplug the tool before attaching or

removing accessories. Use only speciﬁ cally

recommended accessories. Others may be

hazardous.

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Milwaukee 4096 Operator's Manual Page 12

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