In this Question Line video, Jason answers the following question regarding tolerances for fillets and rounds:

What are typical ways to add a R.55 round to every edge? For example, if I have a cube and I want to add a R.55 round to every edge, could I use a tolerance like R.55+/-0.05? Are there other/better ways to define a tolerance for a round?

 

Jason discusses that the tolerance suggested for the rounds in the submitted question, shown in the figure above, is an acceptable way to dimension and tolerance an outside round or an internal fillet. However, he demonstrates why there will always be ambiguity in defining what the size of that radius actually is and whether it falls within the limits.

Jason then gives examples of how GD&T can be used to apply profile of a surface to the radii, allowing more direct control of the size and form – without having to worry about applying one value that represents the irregular radius as in the submitted example.



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