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Minimum Number of Hardness Readings

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  • #47764

    C. Fletcher
    Participant

    When measuring hardness of iron, steel, or any other metal, is there a generally accepted minimum number of readings that will result in reasonable test time and accuracy?

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    #159664

    Evil
    Participant

    It really depends on what you’re doing with the measurement. Every measurement has some random error in it and thus affects its precision. If you’re trying to say whether or not something is “in spec”, you’ll need to understand the precision to tolerance ratio. If you’re trying to understand if the hardness of samples is different, then %GR&R is more appropriate. Regarding accuracy, calibration will minimize absolute errors.

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