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Gauge RR results interpretation

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  • #43697

    Lorax
    Participant

    Folks,
    In a GR&R why is it that “% Contribution” is the preferred indicator as to whether a gauge is up to snuff or not?
    Why not the “% Study Variation” or “% Tollerance” columns? I know that they can be used but everything I read pushes me to use the “% Contribution” instead.
    I see that % Contribution is additive and totals nicely to 100 which is a nice thing but I’d have thought the increased resolution available with the other two would outweigh that.
    Lorax
     

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    #138965

    Jered Horn
    Participant

    Lorax,
    I’ve always used % Study Variation with the following rules: <5% = No issues; 30% = Gage system needs improvement/corrective action.
    I think it’s more common to talk in terms of variation or standard deviation rather than variance…which is why I’ve always looked at the % Study Variation term(s).
    And I’ve never been a big fan of % Tolerance.  I can see where a customer quality engineer may be interested in this, as it gives you an idea of how good your gage is in relation to the acceptable tolerance.  But, for Six Sigma, where we are concerned mainly with process variation (and the reduction/elimination of it), we want to know if the gage is capable of detecting (sometimes even the slightest) changes to the process.
    Just my two cents.  Hope it helps.

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    #138966

    Lorax
    Participant

    That sounds fair.
    I guess looking at the “% Study Variation” also has the advantages of being right beside “% Tolerance” (as long as you have put in the tolerance gap). So that the most appropriate assessment of the variation coming from the measurement system can be picked.
    Thanks
    Lorax

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    #138984

    Ken Feldman
    Participant

    What program gives you an output of  “% Tollerance”????  Maybe the program needs a spell checker.

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    #138990

    Lorax
    Participant

    Ahh.
    Now I understand Mike’s comment re Quentin’s post…
    Lorax

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