Evaluating the Gauge Repeatability and Reproducibility for Different Industries |
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Authors: | Jeh-Nan Pan |
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Institution: | (1) Department of Statistics, National Cheng-Kung University, 1 University Road, Tainan, Taiwan, R.O.C, 70101 |
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Abstract: | Measurement plays a significant role in Six sigma program. Usually, the gauge repeatability and reproducibility (GR&R) study
needs to be conducted prior to the process capability analysis for verifying the accuracy of measuring equipments and helping
organizations improve their product and service quality. Therefore, how to ensure the quality of measurement becomes an important
task for quality practitioners. In performing the GR&R study, most industries are using the acceptance criteria of Precision
to Tolerance(P/T) ratio as stipulated by QS9000. However, the adequacy of applying the same acceptance criteria to different
manufacturing processes is very questionable. In this paper, a statistical method using the relationship between GR&R and
process capability indices is proposed for evaluating the adequacy of the acceptance criteria of P/T ratio. Finally, a comparative
analysis has also been performed for evaluating the accuracy of GR&R among three methods (ANOVA, Classical GR&R, and Long
Form). Hopefully, the results of this research can provide a useful reference for quality practitioners in various industries. |
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Keywords: | Six sigma program gauge repeatability and reproducibility precision to tolerance (P/T) ratio ANOVA classical GR& R method long form method |
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