Run an AIAG-compliant Gage R&R study using the average and range method. Enter your measurement data and get instant repeatability, reproducibility, and %GRR results.
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Gage R&R (Gage Repeatability and Reproducibility) is a measurement system analysis that quantifies how much variation in measurements comes from the measurement system itself versus actual differences between parts. It separates variation into repeatability (same operator, same part) and reproducibility (different operators, same part).
Per AIAG MSA guidelines: %GRR ≤ 10% is acceptable (pass), 10-30% is marginal and may be acceptable depending on the application, and > 30% is unacceptable (fail) and requires improvement to the measurement system.
NDC represents the number of non-overlapping confidence intervals that span the range of part variation. An NDC ≥ 5 indicates the measurement system can distinguish between parts adequately. NDC is calculated as ⌊1.41 × (PV / GRR)⌋.
A typical Gage R&R study uses 2-3 operators, 10 parts, and 2-3 trials per operator/part combination. The minimum is 2 operators, 5 parts, and 2 trials, but more data provides better statistical confidence.