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Parallelism Calculation


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Projected zone in position is useless for planes. For axis it is - almost always it it used for assembly check.
For parallelism it is nonsence. Even that diameter sign in P is nonsence.
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Then don't call it nonsense if you don't even know what it is to begin with.

If the feature that is being controlled is a cylindrical feature then you can use the diameter symbol to indicate that the tolerance zone is cylindrical. This controls the parallelism of the axis with respect to two perpendicular datums if that's the desired control.
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I wasn’t gonna say anything to this one, but it was not about the parallelity of an axis to another feature, this was about a projected tolerance zone of a plane, which can be done diametrically, but of course the projection zone can be cartesian, too. Instead of the diameter symbol, you could specify a tolerance zone "16/16". So the P symbol does not force a diametrical tolerance zone. But that’s the only thing that needs correction.
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