iSixSigma

GageRR

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  • #39821

    Geo
    Participant

    I found this ‘rule of thumb’ on one web site. Yet on another it said the rule of thumb was 15%….is there a true rule of thumb? If so, what is it?
    “The rule of thumb for acceptance of a measurement system is a total Gage R&R of 30% or less of the lessor of Total Variation or the Specification Tolerance. “

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    #122150

    BBMole
    Participant

    30% is a rule of thumb as acceptable, in most cases. 10% is used to indicate an excellent measurement system. It depends what you are looking to do. If you can live with 30% why spend extra cost to reduce the variation. Six sigma as always is a balance against the cost of getting to the desired quality level.

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    #122153

    Scott
    Member

    I use the JMP software and in their help menu they give the following values.ย  Hope this gives you another perspective.
    < 10% excellent
    11% to 20% adequate
    21% to 30% marginally acceptable
    > 30% unacceptable.

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