IADC Dull Grading DRILL BITS Roller Cone All inner rows Gauge row only In columns and a linear scale from to is used to describe the condition of the cutting structure accordi - Pdf

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IADC Dull Grading DRILL BITS Roller Cone All inner rows Gauge row only In columns and a linear scale from to is used to describe the condition of the cutting structure accordi

No loss of tooth height Total loss of tooth height Insert Bits A measure of total cutting structure reduction due to lost worn andor broken inserts No lost worn andor broken inserts All inserts lost worn andor broken 57412574615745257452573765741157

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IADC Dull Grading DRILL BITS Roller Cone All inner rows Gauge row only In columns and a linear scale from to is used to describe the condition of the cutting structure accordi






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