1992 · 14 citations · 3 references
EngineeringCivil EngineeringCriterion-referenced AssessmentMetrologyQuality EngineeringGrade ControlGradingGrading PolicyBit Dullness AnalysisQuality GradingSubjective Grading Systems
ABSTRACT In 1987, the LADC adopted an improved Rock Bit Dull Grading System.1 Although it was modeled after the previously used T-B-G System, it was expanded to provide a much clearer "mental picture" of a dull bit. This paper documents the changes from the 1987 version to the 1992 LADC Dull Grading System. Since the changes are minor, they are listed at the beginning of the paper. Additionally, for those needing more detail, the entire 1992 IADC Dull Grading System is presented.
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First Revision to the IADC Fixed Cutter Dull Grading System
B. D. Brandon, Jerry Cerkovnik, Earl Koskie et al. · 1992 · 29 citations
Development of a New IADC Fixed Cutter Drill Bit Classification System
B. D. Brandon, Jerry Cerkovnik, Earl Koskie et al. · All Days · 1992 · 14 citations
Engineering, Industrial Engineering, Construction Technology +10
The IADC Roller Bit Classification System
D. Y. McGehee, J. S. Dahlem, J. C. Gieck et al. · 1992 · 14 citations