iSixSigma

Flatness MSA

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  • #55614

    sam
    Participant

    Hello,

    I am doing an MSA on our measurement process for flatness. We are using an inverted gauge installed under a granite block. The issue I have is that when measuring flatness, no two operators are going to be hitting the exact same points. I can create a fixture to ensure they are hitting the same points during the study, but in production, they are not using a fixture so it will not be a true representation of the current measurement system. The part is a 3×5 oblong shape with various holes drilled into it.

    What do you recommend I do?

    I am going to run the MSA on the current state process just to see how crazy the numbers look.

    Thanks.

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    #200697

    MBBinWI
    Participant

    @BuckeyeGuy92 – Not sure I should help a guy from Ohio.

    I agree that creating a template is one way to help get all operators to take measurements more representative of one another. And, you are correct that setting up a template to ensure the same points are being taken isn’t representative of the current actual process. So, what might you do to overcome that situation?

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    #200702

    BuckeyeGuy92
    Guest

    Thank you for your reply.

    Ultimately I am going to change the measurement process to ensure the same points are taken on each part by each operator. Before doing this, I need to show management how unreliable our current process is.

    We also have a CMM we use to measure flatness for other products. Though the CMM has its own issues, we can at least guarantee the same points are taken for each part. There will have to be another MSA to confirm its process.

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    #200715

    MBBinWI
    Participant

    @BuckeyeGuy92 – I agree. It will be most effective if you can relate the measurement error to financial impact. How many “bad” parts have escaped that results in warranty costs, how many “good” parts were rejected incurring rework/scrap costs?

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