iSixSigma

Gage RR

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  • #53415

    O’Connell
    Participant

    When we do the Gage R&R in minitab, the results for Gage R&R is given in % study variation and in % tolerance. Which one to choose? I am working on a new component and has to submit the PPAP to the customer. Can some one help me?

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    #190019

    bbusa
    Participant

    If you look closely at the formula ( use Minitab Help ) , you will realize they are not very different ,except that the % tolerance uses spec limits . For obvious reasons , if wide tolerances are considered , you will end up reporting a low Gage R & R – Probability of a Type II error will be high

    Others on this forum may not agree , but I prefer reporting % contribution of components of variance ( given in Minitab Output Table II ) as it makes (statistical) sense .

    Just my opinion .

    Pl check with your OE – just in case they prefer a different format !

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    #190027

    Mikel
    Member

    Different purposes –

    % tolerance – is my measurement capable to protect my customer?

    % study (or % contribution – they tell you exactly the same thing if you understand them) – is my measurement capable to help improve my process?

    Both are important.

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    #190029

    bbusa
    Participant

    For the same measurement system , I may end up with different % tol results for two different customers –

    What do I do ? Leave the MS as it is or adjust ?

    Just curious

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    #190030

    Hody
    Member

    If you use % tol, you should probably use the tightest spec between multiple customers (assuming that you are using the same gauges) to qualify the line… I assume that you want your process/line to be consistant…

    But I also completely agree with Stan’s comments and how % tol and % contrib are both important.

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