![]() ![]() specular, as-welded, as-cast etc.), which is, for example, important in seals (different types of gaskets require different types of finish). a pin must be cylindrical enough to rotate well inside a hole), while roughness measures the finish of a surface (e.g. Leaving behind academia, geometrical tolerance controls how much a particular shape is allowed to deviate from an ideal one (e.g. Then, though tolerances and roughness may not be generated by the same phenomena, from a geometrical perspective they are the same thing, but of different order of magnitude. What is left is the micro-geometry of the surface, which we call roughness. ![]() ![]() In fact, when measuring roughness, you first have to "read" the surface geometry with the proper instrumentation, then you must filter the data so that any macroscopic deviation from the ideal shape (i.e. I would add that, while in practice tolerances and roughness are treated as two different topics, in reality there is a connection between them. ![]()
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