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Nested or Crossed ANOVA – Destructive GRR

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  • #42456

    MARS
    Participant

    Some references advise using nested anova in analyzing destructive GRR studies? What is the rationale behind it? Why can’t I use crossed ANOVA even if I can create  “pseudo replicates”??
    Thanks

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    #134560

    NATZIC
    Participant

    I have competed several destructive R&R’s in the past. You have 2 options

    Use the Wheeler control chart method. There is a paper on this I obtaied from the web before, but am unable to locate it at the moment. Do a web search. I found it pretty good
    The easier option is to use the std method in minitab. If your R&R comes out low your gauge should be acceptabe as the total R&R will include within part variation, this should obviously be zero but won’t be as the parts are destroyed.Your true R&R will actually be lower then this.
    Unfortunately both methods require homogeneous parts so be careful when selecting them.
    good luck

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    #136192

    Paolo
    Participant

    Hey there!
    ……I’am looking for someone that has experience in destructive GRR on powders. You don’t happen to make the GRR on a powder or similar….? 

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