Gage R&R on a delta measurement - Particle measurement count tool
We have a customer asking us to do Gage R&R on a particle measurement tool. Our spec is for a delta in count, i.e. pre and post processing, to determine the allowed number of particles the processing itself can add to our product. We designed and performed an ANOVA. The problem we're having is that when we calculate the results using our spec (i.e. delta number), the value comes out extremely high. For example, a product has to have less than 50 to be used. The spec is a delta of no more than 50. If we have product that has an initial count of 25 and a post count of 74, it passes. The delta is 49, which is acceptable, but that 49 takes up almost all of the window, making it seem as if the tool is incapable. We also looked at calling this an attribute, i.e. pass/fail, but we have to apply that against the delta spec instead of the real physical measurement. We found a short study method for attribute in the AIAG manual 2nd edition, however our customer will probably not like this as there are no numbers attached. Does anyone have any good ideas? Thanks.