14 Major PDC Dull Characteristic Description & Causes
Definitions for PDC Bit Dull Characteristics (Column 3)

Bit Dull Grading Characteristic or column 3 In IADC Bit Dull Grading is used to characterize the predominant failure mode for a bit. For a primary dull characteristic, the following definitions apply:

Broken Teeth - More than 1/2 of the cutter is broken off, and the break occurs in both the diamond layer and the tungsten carbide substrate.

Chipped Teeth - A cutter which has minor breakage. Less than half of the cutter has been broken.
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