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Gage RR study

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  • #36560

    Kevin Jackson
    Participant

    In a gage R&R study, is there any tolerance level for %EV, %AV and %PV?? I know the %R&R must be less than 10% for the measurement system to be accurate and in some cases less than 20% is acceptable depending on the type of measurement that is being taken. Thank you

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    #105900

    Ivan
    Participant

    Dear Kevin,
    %EV & %AV are the components of %R&R. Mathematically,
    (R&R)=Sqrt(EV^2+AV^2).
    As you can see, you can only balance between EV & AV to limit your R&R within 0.1
    R&R is evaluated as a % of tolerance & % of process variation. If the measurement is to sort good parts from bad, you need to ensure %R&R based on tolerance. If the measurement is for the purpose of monitoring & controlling the process, you need to achieve 10% R&R based on process variation (PV). PV can be obtained from your capability study results. Usually, it is 5.15 * sigma.
    Hope this helps.
    Ivan.

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    #138018

    Kumar
    Participant

    I have a data .233,.235, .236, .239, .237, .234
    Tol: .240 +/-.003
    From here how i can calculate R&R percent.

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    #138024

    Jered Horn
    Participant

    Rules of thumb…When you conduct a gauge R&R study, set it up with at least 10 parts, at least 2 operators, and have each operator measure each part (randomly) at least two times.  It’s also good to conduct the study over a two-day period…repeat measurements are a day apart.
    The data you presented is not sufficient for a gauge R&R study.

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    #138038

    Heebeegeebee BB
    Participant

    10/2 is a good rule of thumb.
    I like 5/3.
    Whatever works for you!
    ;-)

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    #138040

    Whitehurst
    Participant

    I as well like the 5/3/3 it has proven most reliable in manufacturing measurments.  Take a look at the minitab function if you have it available, or if you would like, i can send you my home brew excel one we used at Ford.

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    #138084

    Siva
    Member

    i a siva in chennai  98413 69686

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