Case Study-Attribute Gauge R&R
Discover how Attribute Gauge R&R validates Eddy Current Testing for tap hole minor diameter inspection, ensuring accuracy and reliability in manufacturing.
KIMEC|Expert Group 
Ensuring Precision in Quality Control: Attribute Gauge R&R for Eddy Current Testing of Tap Hole Minor Diameter
Introduction
In high-precision manufacturing, inspection reliability is critical. This post explains an Attribute Gauge Repeatability and Reproducibility (R&R) study for an Eddy Current Test (ECT) system used to evaluate tap hole minor diameter. The study confirms the system’s suitability for production quality control.
Why Attribute Gauge R&R Matters
Attribute Gauge R&R assesses:
- Repeatability: Does the same inspector give consistent results?
- Reproducibility: Do different inspectors agree with each other and the standard?
- Reliability: Can we trust the inspection process for OK/NG decisions?
Study Overview
- Inspection Method: Eddy Current Testing (ECT)
- Feature: Tap Hole Minor Diameter (M8 × P1.25, tolerance class 6H)
- Samples: 22 parts (OK and NG)
- Appraisers: 3 inspectors (A, B, C)
- Trials: Each appraiser inspected all samples twice.
Key Findings
1. Internal Consistency
All appraisers showed 100% repeatability within their own evaluations.
2. Agreement with Standard
- Appraisers A and B: 100% accuracy
- Appraiser C: 95.45% accuracy (one misclassification)
3. Statistical Indicators
- Overall Agreement: 95.45%
- Fleiss’ Kappa: 0.97 → Near-perfect agreement
- p-value: 0.0000 → Statistically significant
Correlation Analysis
The study also examined the relationship between minor diameter and ECT value:
- Pearson Correlation: -0.981 → Almost perfect negative correlation
- Regression Model:
ECT Value=1870−187.8×Minor Diameter - R²: 96.17% → Extremely strong linear relationship
Practical Implications
- Inspection Reliability: ECT system validated as highly accurate.
- Process Control: Maintain minor diameter within tolerance for desired ECT performance.
- Predictive Modeling: Use regression for quality forecasting.
Conclusion
The Attribute Gauge R&R study confirms excellent reliability of the ECT system for tap hole inspection. Combined with strong correlation analysis, manufacturers can confidently use ECT for real-time quality control.
Next Steps
- Schedule calibration and GRR checks every 6 months.
- Train appraisers on borderline cases.
- Apply regression model for predictive quality monitoring.
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