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Setting up the tolerance chain step-by-step

In the article ‘step plan tolerance analysis’, the steps to achieve a good tolerance analysis are briefly summarized. In the articles that followed, the method of adding tolerances is discussed. Much attention was paid to the statistics of dimensional...

Tolerance Stack-Up Analysis and Process Capability Index Cpk

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. The resulting picture is that...

In previous articles about tolerance analysis, I discussed the step-by-step plan and the way of adding up. Adding up tolerances can be a worst-case sum or a statistical sum. In ‘The distribution of tolerances’ I also discussed the types of distributions...

The Distribution of Tolerances

In a previous article the statistical tolerance stack-up analysis is discussed. It is usually profitable to do a statistical tolerance stack-up analysis instead of a worst-case analysis. A worst-case analysis often leads to low tolerance specifications and therefore...

Statistical Tolerance Stack-up Analysis

In the article Worst-case Tolerance Stack-up Analysis you read about the worst-case or linear stack-up analysis. Such an analysis assumes that all dimensions in the tolerance chain have worst-case deviations form their nominal value. A statistical tolerance stack-up...

Worst-case Tolerance Stack-up Analysis

Suppose that you went through your tolerance analysis step plan and made a tolerance chain. The only thing to do now is to add up all tolerances. This seems easy enough but there are a few questions to consider: What to do with asymmetrical tolerances? Do you perform...

Tolerance Stack-up Analysis

Tolerances become important as soon as you design an assembly of parts. Of course each dimension must be provided with a tolerance. But in an assembly the tolerances become important because all parts must fit. In this article I tacitly will assume that we are dealing...