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I was wondering if anyone has any tips on understanding the results of a gage R&R for a two-step measurement process. In order to meet the requirements of our customer we must have the % R&R less than 30 and the only way to achieve this is to break the steps out and study each step individually. What worries me is that we use the combination of the two measurements to monitor and control the process. Are there any good tips for developing confidence intervals for two-step measurement processes?
(The specific measurement involves measuring from a mounting flange to the center of a round feature. We first find the radius of the feature with an air type bore gage and then find the height of the bottom of the feature from the flange. The two measurements are then added to acquire the final dimension.)

(The specific measurement involves measuring from a mounting flange to the center of a round feature. We first find the radius of the feature with an air type bore gage and then find the height of the bottom of the feature from the flange. The two measurements are then added to acquire the final dimension.)

