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Estimation of Gauge R&R by Variance Components of Measurement ANOVA  

Choi, Sung-woon (Department of Industrial Engineering, Kyungwon University)
Publication Information
Journal of the Korea Safety Management & Science / v.12, no.1, 2010 , pp. 199-205 More about this Journal
Abstract
The research proposes the three-factor random measurement models for estimating the precision about operator, part, tool, and various measurement environments. The combined model with crossed and nested factors is developed to analyze the approximate F test by degrees of freedom given by Satterthwaite and point estimation of precisions from expected mean square. The model developed in this paper can be extended to the three useful models according to the type of nested designs. The study also provides the three-step procedures to evaluate the measurement precisions using three indexes such as SNR(Signal-To-Noise Ratio), R&R TR(Reproducibility&Repeatability-To-Total Precision Ratio), and PTR(Precision-To-Tolerance Ratio), The procedures include the identification of resolution, the improvement of R&R reduction, and the evaluation of precision effect.
Keywords
Random Measurement Models Combined Model; Crossed and Nested Factors; Approximate F Test; Point Estimation of Precisions; SNR; R&RTR; PTR;
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