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Defining acceptance criteria on parts in order to maximise the use of functional condition domain

A. Van Hoecke


Designers have at one’s disposal several methods to calculate tolerances within dimension’s chains and can specify several statistical indicators. The worst case method can conduct to over quality, quadratic often conducts to insufficient quality. Efficiency of other candidate methods are studied below and a new one is proposed, with the target to guarantee the functional condition at an acceptable level and allow the largest variation area on the components.
A simple solution consists in assigning to the parts the usual worst case tolerance range, and in verifying it regarding the Cpktarget / √(lenght of dimension chain)


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