Bit Dull Grading Steps & IADC Handbooks - TriCone PDC
What Is The IADC Bit Dull Grading For PDC & TriCone Bits

As each drill bit is pulled from the hole its physical appearance is inspected and graded according to the wear it has sustained and this is called Bit Dull Grading. In this article, we will explain why we need to do IADC Bit Dull Grading For Both PDC Drill Bit & TriCone Drill Bit.

The IADC Bit Dull Grading system has recently been revised (1987) so that it may be applied to all types of bit (Tricone or fixed cutter (PDC, Diamond) ).
https://www.drillingmanual.com/bit-dull-grading/