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We have a part here with a spherical cut and in order to locate it you have to have more than 2 axis. I'm not sure I am folowing your question in regards to datums.
You can have 3 axis defining the location of your tolerance zone without your tolerance zone being spherical. It makes for a goofy drawing but I have seen it. A shperical cut is just that a cut that is the shape of a sphere, an inside sphere.
Please show me a print with 3d TP or spherical TP. To my knowledge ( I could be wrong) I have never in my 25 years in this trade seen a callout specifically identifying such an animal.
Your interpretation may be a spherical tp. In referencing the ANSI 14.5 standard of GD & T, I can find no such animal...I am not trying to prove anyone wrong here, just I have never seen an example. Maybe I will learn something new, maybe you will....
3.3.7 Diameter and Radius Symbols. The
symbols used to indicate diameter, spherical diame-
ter, radius, spherical radius, and controlled radius are
shown in Fig. 3-8. These symbols precede the value
of a dimension or tolerance given as a diameter or
radius, as applicable. The symbol and the value are
not separated by a space.
i have seen 3d true position (spherical) on a few sheet metal drawings for gm.
Just wanted to say that even if a feature has three basic dims to it but is called out as a diametric tp (two axis) then i report it as two axis and use the third axis as incomplete or basic no fcf. Usually it is obvious which datum axis is insignificant. Sometimes not. But, call me cantankerous if you want, i give them what they ask for and don't care much for second guessing engineers.
I have seen 3d true position (spherical) on a few sheet metal drawings for GM.
Just wanted to say that even IF a feature HAS three Basic Dims to it but is called out as a diametric TP (Two Axis) then I report it as two axis and use the third axis as incomplete or BASIC NO FCF. Usually it is obvious which Datum Axis is insignificant. Sometimes not. But, call me cantankerous if you want, I give them what they ask for and don't care much for second guessing Engineers.
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