When reporting the Gauge R&R in version 13.1.0 the below report is available. When I open help, the below does not specify which is the % Gauge R&R number for the guidelines. Example of the Gauge R&R Report Note: To generate the reduced Gauge R&R report, select File > Preferences > Platforms > Variability Chart > Reduced Gauge RR Report . In this example, the values in the Variation column are the square roots of sums of variance components scaled by the value of k (6 in this example). Acceptable Percent Measurement Variation shows guidelines for measurement variation, as suggested by Barrentine (1991). Acceptable Percent Measurement Variation < 10% excellent 11% to 20% adequate 21% to 30% marginally acceptable > 30% unacceptable Note the following: • If you have provided a Tolerance Interval in the Enter/Verify Gauge R&R Specifications window, a % of Tolerance column appears in the Gauge R&R report. This column is computed as 100*(Variation/Tolerance). Also, a Precision-to-Tolerance ratio appears at the bottom of the report. This ratio represents the proportion of the tolerance or capability interval that is lost due to gauge variability. • If you have provided a Historical Sigma in the Enter/Verify Gauge R&R Specifications window, a % Process column appears in the Gauge R&R report. This column is defined as follows: 100*(Variation/(K*Historical Sigma)). • The Number of Distinct Categories (NDC) is defined as (1.41*(PV/RR)), rounded down to the nearest integer. Below are my results. If I use the 3.4% Gauge R&R then I believe my MSA is Excellant. But if I look at the .81 Precision to Tolerance Ratio my MSA is not good as I would read this as 81%. Which is the correct number to use for the above guidelines? Gauge R&R (copied as Text) Measurement Source Variation (6*StdDev) % of Tolerance which is 6*sqrt of Repeatability (EV) 0.0779517 77.95 Equipment Variation V(Within) Reproducibility (AV) 0.0221650 22.17 Appraiser Variation V(Technician) Technician 0.0221650 22.17 V(Technician) Gauge R&R (RR) 0.0810417 81.04 Measurement Variation V(Within) + V(Technician) Part Variation (PV) 2.3527216 2352.7 Part Variation V(Part SN) Total Variation (TV) 2.3541170 2354.1 Total Variation V(Within) + V(Technician) + V(Part SN) 6 k 3.44255 % Gauge R&R = 100*(RR/TV) 0.03445 Precision to Part Variation = RR/PV 40 Number of Distinct Categories = 1.41(PV/RR) 0.1 Tolerance = USL-LSL 0.81042 Precision/Tolerance Ratio = RR/(USL-LSL) Using last column 'Part SN' for Part. Variance Components for Gauge R&R Component Var Component % of Total Gauge R&R 0.00018244 0.12 Repeatability 0.00016879 0.11 Reproducibility 0.00001365 0.0089 Part-to-Part 0.15375831 99.88 +++++++++
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