Criteria of Determining the P/T Upper Limits of GR&R in MSA

Criteria of Determining the P/T Upper Limits of GR&R in MSA The MSA combines estimates of the variations of repeatability and reproducibility and is mainly analyzed by experimental design. The variations of personnel, measurement equipment, and the part itself can be analyzed via the data obtained to improve the capability of the measurement system. MSA of both QS9000 and ISO/TS16949 defines GR&R acceptable criteria. GR&R of the MSA in QS9000 is determined by the Precision-to-Tolerance (P/T) value, the percentage of the measurement system variations to the deviation during the manufacturing process or to the part tolerance. If the P/T value is less than 10%, the accuracy of the measurement system is acceptable. If the P/T value falls between 10 and 30%, acceptance of the accuracy of the measurement system is up to the company. When the P/T value is greater than 30%, precision of the measurement system will not be accepted. The aforementioned GR&R acceptance criteria were established by three major automobile companies of the US according to their past experiences. As the capability index C pm reflects both process yield and process loss, we use C pm to set a proper range of GR&R acceptable criteria. If the P/T value is not within the acceptable range, the measurement system is required for modification. If the P/T value is within the acceptable range, The process capability can be enhanced by improving the manufacturing process. Quality & Quantity Springer Journals

Criteria of Determining the P/T Upper Limits of GR&R in MSA

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Springer Netherlands
Copyright © 2006 by Springer Science + Business Media B.V.
Social Sciences; Methodology of the Social Sciences; Social Sciences, general
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