Attribute R&R on Machines

Six Sigma – iSixSigma Forums General Forums Tools & Templates Attribute R&R on Machines

This topic contains 3 replies, has 4 voices, and was last updated by  Mike Carnell 1 year, 6 months ago.

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    I need some help if at all possible. I need to conduct an R&R on a trace machine that doesn’t give a number only a form that compares back to the Cad model. Is this even possible to do and if so; how do I conduct it when I only have 3 operators that use the machine. As you’ll notice on the attached picture. All the employee needs to do is set up the part and push start, The machine does the rest.


    Chris Seider

    question: How do you determine if it’s an acceptable match?

    Your gage R&R should determine that. If it’s attribute, then you’ll do an attribute gage R&R but I suspect the “gage” would fail for marginal items that are close to being good enough.

    Does this output electronically? I would think you could look at total absolute error (like measuring area under a curve) and use that but I’d NEVER tell a client how to measure acceptability. Your organization must have some technique already and your gage should evaluate that technique.

    Hope this helped.


    James Masefield

    Hi @tbhill,

    What is the output of the measurement? You’ve mentioned it compares a scan against a CAD model, but there must be an output once this information has been processed? Is it something on the lines of [Pass] vs [Reject]?

    If so, I’d recommend the Attribute Agreement Analysis. If you have Minitab, it’s located under Quality Tools. Read up on the Fleiss Kappa Stat’.

    The activity will answer the following questions:

    > Does the appraiser agree with the known standard?
    > Does the appraiser agree with themselves?
    > Do the appraisers agree with each other?


    Mike Carnell

    @tbhill Obviously you haven’t given us enough information to give you a succinct answer.

    This is just reading between the lines. It sounds like you tester is making a resistance measurement to determine if a trace is going where it should? If that is the case two questions 1. How does it know it isn’t going where it should as well as some other place i.e. a short somewhere on the trace. 2. if it is a using resistance there is some place where it makes a decision from some form of continuous dat to convert it to the form you are getting, can you get to the data before it converts?

    Just some random thoughts

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