This seems easy enough but there are a few questions to consider: What to do with asymmetrical tolerances? Do you perform.īy Jaap Vink | Tolerances become important as soon as you design an assembly of parts. The only thing to do now is to add up all tolerances. A statistical tolerance stack-up.īy Jaap Vink | Suppose that you went through your tolerance analysis step plan and made a tolerance chain. Such an analysis assumes that all dimensions in the tolerance chain have worst-case deviations form their nominal value. A worst-case analysis often leads to low tolerance specifications and therefore.īy Jaap Vink | In the article Worst-case Tolerance Stack-up Analysis you read about the worst-case or linear stack-up analysis. It is usually profitable to do a statistical tolerance stack-up analysis instead of a worst-case analysis. In ‘The distribution of tolerances’ I also discussed the types of distributions.īy Jaap Vink | In a previous article the statistical tolerance stack-up analysis is discussed. Adding up tolerances can be a worst-case sum or a statistical sum. The resulting picture is that.īy Jaap Vink | In previous articles about tolerance analysis, I discussed the step-by-step plan and the way of adding up. Tolerance Stack-Up Analysis and Process Capability Index Cpkīy Jaap Vink | Previous articles have discussed the application of statistics in tolerance analysis: how statistical addition works, how to incorporate the influence of different distributions, and combining worst-case with statistical contributions.
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