![]() Simulating a population of manufactured parts ![]() This results in extremely expensive parts and/or significant scrap as a result of rejected parts in quality control. But why is it even important to understand this method when specifying tolerances for production parts? Worst case tolerance analysis is almost always too conservative to apply to large manufacturing runs, resulting in an over specification of manufacturing tolerances (ie: tolerances are unnecessarily too tight). The root sum squared (or RSS) method is a statistical tolerance analysis method that allows you to simulate the expected outcome for a population of manufactured parts and their associated assemblies. The root sum squared (RSS) method - an overview ![]() In this article we’ll be building your foundational understanding of the RSS tolerance analysis method by first reviewing the underlying math and statistics, discussing the practical application to manufacturing problems, running through a few examples to put this knowledge into action, and then closing with key takeaways that you can apply to any tolerance analysis problem you face in your career. It sounds simple, but in practice it is a multidimensional challenge that requires a variety of mathematical and statistical tools to tackle effectively. As engineers and designers, it’s our job to understand how this dimensional variance will impact the as-built functionality of the products we design. The reality of designing physical products is that manufactured parts always have some degree of dimensional variance as a result of manufacturing processes. The goal of this article is to familiarize you with how to conduct root sum squared (RSS) statistical tolerance analysis for mechanical engineering applications. Now on to the nerdy stuff! Cheers!) Introduction Take a look, we'd love to help you if we can. If so, you might be interested in how Five Flute can be used to streamline your drawing review process. (A bit of housekeeping! Since you care about tolerance analysis I'm guessing you also make 2d drawings.
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