SYMPOSIA PAPER Published: 01 January 1989

Gage Repeatability and Reproducibility Studies of Rockwell Scale Hardness Testers


It is difficult to interpret the results of gage repeatability and reproducibility (GRR) studies on Rockwell scale test instruments because (1) the test can never be performed in the same place more than once, (2) no material is completely uniform in hardness, and (3) the expected variation in hardness is itself hardness dependent.

Therefore, the concept of material variation (MV) must be added to the already recognized sources of variation called equipment variation (EV) and appraiser variation (AV).

Following specific procedures outlined in this paper will insure performance of the most realistic GRR study. Interpretation of the results using methods suggested in this paper will aid in understanding the information gathered in this study.

Author Information

Cieplak, JJ
Bryce Office Systems, Inc., Oxford, CT
Tobolski, EL
Wilson Instruments, Binghamton, NY
Williams, DM
Wilson Instruments, Binghamton, NY
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Developed by Committee: E28
Pages: 52–60
DOI: 10.1520/STP24012S
ISBN-EB: 978-0-8031-5086-7
ISBN-13: 978-0-8031-1251-3