This can result in too much or too little compression which can cause the o-ring to fail. Also known as tolerance stacks, it is a mathematical and statistical problem solving method for variation accumulation allowed by the specified dimensions. If the nominal o-ring size is 0.030″, it is easy to see that the tolerance stack-up is nearly half the size of the o-ring. In this example the metal and o-ring dimensions can vary up to 0.012″. Use the TolAnalyst tools to perform worst-case tolerance stack-up analysis on. Illustration 5.5 below shows a situation where the o-ring cross section tolerance is ± 0.003″, the groove diameter tolerance is ± 0.002″, and the bore diameter tolerance is ± 0.001″. DimXpert for assemblies places dimensions and tolerances on assemblies. The combination of these tolerances is the tolerance stack-up. In any sealing application, the tolerances of all the parts in contact with the o-ring must be considered in order to create an effective seal. What Is a Tolerance Stack Up (1) HLM method This method assumes that an output is the sum of individual contributors.
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