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GRR for destructive test.

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  • #31749

    Yadwadkar
    Participant

    How to do GRR for destructive test.We in factory face problem of GRR for Pull Strength wire bond. as test is destructive one how to test for equipment & appraiser variation.

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    #84052

    Andhale
    Participant

    In mintab there is option for Gage R&R Nested that is specifically for destructive testing…you can try it…also can read minitab help for more detail on it.

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    #84066

    Jamie
    Participant

    Using a nested design is appropriate, but the real question I think you are asking is how do I take multiple observations around a sample which is destroyed? Seems impossible and it is. But we can get close by selecting a sample produced very close in time under very same conditions so that you can assume these pieces are really the same (this is the key). We then consider any variation (between these closely selected parts) to be attributed to the measurement system. Sometimes this works very well sometimes not. Consider a chemical batch I could take one sample and subdivide it into 6 samples (to complete my gage study I might take 10 of these batches across the range of process variation subdivided into 6 subsamples each). We treat each group of 6 as if they are really the same sample. I now have enough subsamples for 3 operators to do 2 tests each. Any variation is assumed to be either repeatability or reproducibility. The nested design drops out the oper*part interaction since you truly aren’t retesting the same part. How well does this work? It all depends on how well you can select subsamples that really don’t vary. The good news is that true part variation within your subdivided samples will make your gage look worse. This is good because it is a worse case scenario so if you can get an acceptable gage using this destructive approach, chances are your gage is really a little bit better and you are good to use it.
    Hope this helps, Jamie

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