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When a RR is needed.

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  • #30574

    woey
    Member

     When exactly a R&R study is needed? Does it need to be done after a gage is calibrated? Does it need to happen on a regular basis? What is the standard industry practise for it?
    Thanks

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    #79742

    Marc Richardson
    Participant

    AIAG Automotive Industry Action Group publishes a booklet called Measurement Systems Analysis which answer your questions. Their website is http://www.aiag.org.
    When measuring the product of any process, there are two sources of variation; the variation of the process itself and the variation of the measurement system. The purpose of conducting the GR&R is to be able to distinguish the former from the latter and to reduce the measurement system variation if it is excessive.
    Typically, a gage R&R is performed prior to using it. Have the people who would normally be using the gage participate, that is, operators, inspectors, etc. We repeat the gage R&R anytime we have a new operator or inspector, it is part of our training and certification process. We also repeat it annually to make sure we aren’t experiencing any erosion of skills.

    Marc Richardson
    Sr. Q.A. Eng.

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    #79743

    RT
    Member

    Always perform a GR&R prior to measuring samples for a variation study.  This of course is done to understand how much of the total variation is attributed to measurement error and how much is true process variation.  Typically, from what I remember, an annual  calibration of measurement equipment is industry standard.  I would want to perform a GR&R on my equipment prior to letting the calibration service leave my facility.

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    #79746

    Cone
    Participant

    Performing  a R&R prior to a variation study became the standard for Six Sigma on because we could not trust that the Quality System had honestly delat with this.
    If you perform studies as Marc suggests as part of your system, it is not necessary to do them especially for a study.
    In addition to what Marc suggests; you want sudies for all operators, engineers and supervisor who may use the system to make judgements, all new operators, for any new equipment, and after any calibration or repair. All of these are prior to use for any product or process judgement.

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