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Samples in Gage RR

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  • #38396

    Mauricio Zapata
    Participant

    I have a doubt about the selection of the samples for doing this test.
    Must I select 10 items of the same reference but the different batches and each one read it three times for minimum 2 operators? or
    Must I select 10 different items of the different references and each one read it three times for minimum 2 operators?.
    Thanks for your comments.

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    #114823

    Bob J
    Participant

    Mauricio,
    The purpose of the R&R is to evaluate the variance in the measurement process….  Given this, the samples should contain the full range of measures you would expect to see when the measurement system is in operation…  These samples should be hand selected so that you have the full range… 
    Batching is not a player here unless you need to go to different batches to select your samples so that you can fully exercise the measurement range….
    I’m not sure what you mean by different references so can’t comment on that for you….
    Hope this helps….
    Best Regards,
    Bob J

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    #114854

    Mauricio Zapata
    Participant

    Thanks Bob for your soon answer.
    I want to explain you the term “reference” with one example. We manufacture Paints, then one reference is the color blue, other reference is the color red, etc..
    But, we manufacture the batch #1, the batch #2, etc, for the color blue.
    Best regards,
     
    Mauricio Zapata

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    #114857

    Bob J
    Participant

    Mauricio,
    Thanks!  That helps me understand your situation….
    You should run the R&R on one color at a time….   Also, since I assume you have *many* colors it might be worth focusing your efforts on the ones which you think might be a problem….
    Given your answer I need to revise my earlier response to you since I jumped to a number of assumptions without understanding your situation….   The real answer is “it depends” and this is why…
    You need to collect your samples in such a way as to fully capture the full variability present.  If the main variability exists within a single batch such as positional (top of vat vs bottom or center vs edge) or time (lighter when first mixed and darkens later) then you want to sample accordingly….  If the main variability is batch to batch then you will need to sample multiple batches… 
    Sorry for the confusion but I hope this helps…
    Best Regards,
    Bob J

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    #114864

    Mauricio Zapata
    Participant

    Good afternoon Bob, Your answer clarified the concept and will be very helpful for planning the Gage.
     
    Thank you very much
     
    Mauricio Zapata

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    #114887

    Bob J
    Participant

    Mauricio,
    You are certainly welcome……
    Best Regards,
    Bob J

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