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How Do I Analyze a Batch of Failures with Minitab?

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  • #55304

    Jonathan Wharton
    Participant

    Hi new to Minitab and have a question I cannot find an answer to. I have a batch of failed parts and the list of the cavities that composed that make up the failures. My question is what analysis can I run to see if the occurrence of any 1 cavity or combination of cavities is playing a higher role in creating my failed parts.

    Thanks for the assistance.

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    #199526

    Chris Seider
    Participant

    If you can create a text like field or numerical array for the cavity numbers, put each failed cavity as an individual failure on each row of data and then do a pareto chart to see if something “pops out”. Be sure to look at where on a diagram the high failures are to see if you and your team can find possible reasons for failure.

    I’ve helped teams find we had a misalignment issue when we found all of the failures were on one side of a die. Good luck.

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    #199532

    Ted Karr
    Participant

    Jonathan,

    Take measurements of multiple parts from each cavity and make a box plot of EACH cavity. This is a multivariate chart and will clearly display the part variation within and between cavities. If a difference appears likely then you can run a hypothesis test on the mean values of each cavity to determine if they truly are different. Use the great Minitab assistant screens to guide you and work the examples using their preloaded data sets as referenced in the help screens.

    Ted

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    #199535

    Chris Seider
    Participant

    @tskarr Variable/continuous data is always great and better! :)

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