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Whether there is a diameter symbol or whether there is a spherical symbol does not determine what axis are applicable (2 or 3) but rather the shape of the target zone. You can have a 3 axis basic dimension scenario for a feature with a diameteric (or cylindrical) tolerance zone. Like I said earlier it makes an odd drawing but I have dealt with it. I believe that is what Matt was getting at in regards to dimensioning a point that is the intersection of a diameter and a face. 3 axis define it but it is still a diameteric tolerance zone not a spherical one as the feature itself is a diameter.
I disagree to a point. You MUST have three to have a spherical zone. When it is diametric tolerance zone you MUST have at least two BASIC Dims to locate it. You can have only one BASIC if it is a single axis tolerance zone.
That said, I have seen points with spherical zones. Same with circles in sheet metal.
I have had numerous prints where features have a TP callout to all three
axis and I am given Basics to all three axis. When that is the case I call
the TP to all three axis. This calculation makes a spherical Tolerance zone.
Even if the S is not in the Feature Control Frame using the third axis makes
it spherical.
My biggest pet peeve is a TP callout to a surface. I say that a TP to a surface is a 'Profile'.
Actually I posted an example where the tolerance zone is not spherical even though three axis are used. Guys, tolerance zone shape is not dictated by the number of axis constraining the feature's location/orientation. Tolerance zone shape is dictated by the shape of the feature. Axial features have an axial tolerance zone not a spherical one.
BTW you can not TP a surface a surface is not a FOS so that is actually an illegal callout.
Bill, here is another example where a cylindrical feature is adequately constrained using one basic dimension and a FCF.
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