Dimatec Inc. - Wear Patterns (1 of 3)

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When an impregnated core bit is removed from the drill-hole after use, the resulting wear pattern on the bit face is an important source of information for the operator. By “reading” the bit face, the operator can frequently troubleshoot problems by simply altering the drill’s operating parameters or by changing the bit to a matrix type or waterway configuration that is better suited to the ground conditions.

Click on any of the illustrations below to view actual photos of the corresponding wear pattern. (Image size ranges from 88kb to 115kb.)

New Condition

Click on the illustration for photo (101kb)

For reference purposes, this graphic illustrates the appearance of a new, unused impregnated diamond core bit crown.

Ideal Wear Pattern

Click on the illustration for photo (106kb)

The observed mid-life wear pattern on a properly used impregnated diamond core bit should be relatively flat with slightly chamfered sides.

Normal Retirement

Click on the illustration for photo (88kb)

The full depth of diamond impregnation is evenly consumed.

Outside Diameter Gauge Loss

Click on the illustration for photo (92kb)

Possible causes and solutions:

Vibration - Lower the rotational speed.
Lack of in-hole fluid circulation - Increase the pump rate.
The bit is reaming an undersized drill hole - Check the gauge diameter of the reaming shell in use and replace if found to be undersized.

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	New Condition

	Ideal Wear Pattern

	Normal Retirement

	OD Gauge Loss

	ID Gauge Loss

	Cracked Waterways

	Concave Face Wear

	Convex Face Wear

	Excessive Diamond Exposure

	Glazed Bit Face

	Burnt Bit Crown



	Matrix Selection Chart

	Impregnation Depth

	Waterway Configurations

	Gauge Setting Options

	Bit Crown Profiles

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