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Tolerances are specified on the schematic drawings machinists use to create the part.

It depends on the particular engineer's design. If, for instance, the tolerance was plus or minus 1%, then the tolerance at 350mm would by plus or minus 0.35mm. Some specification require tigher tolerance. For instance, I once specified an aluminum panel to be 3 inches plus 0, minus 0.010 - that's nearly, but not quite 0.1%.

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15y ago

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