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    STP1025

    Gage Repeatability and Reproducibility Studies of Rockwell Scale Hardness Testers

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    Abstract

    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.

    Keywords:

    hardness testing, Rockwell, gage repeatability and reproducibility(GRR), statistical process control, hardness standards


    Author Information:

    Cieplak, JJ
    Vice president—Marketing, Bryce Office Systems, Inc., Oxford, CT

    Tobolski, EL
    Vice president—Manufacturing, and applications engineer, Wilson Instruments, Binghamton, NY

    Williams, DM
    Vice president—Manufacturing, and applications engineer, Wilson Instruments, Binghamton, NY


    Committee/Subcommittee: E28.06

    DOI: 10.1520/STP24012S