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As far as I know there is no such thing as spherical TP. There is however, such a thing as a spherical cut which can be controled by true position using more than 2 axis. That spherical cut must qualify as a feature of size, a spherical radius does not qualify as a feature of size though.
I'm not familiar with "spherical mode". What is that? I suppose the target zone for a spherical radius would be sherical but that is not to say that all TPs with 3 axis callouts would be a spherical target zone. I am curious if it is legal to TP a saw cut as long as it is a FOS. If you could I suppose that too would be a spherical target zone.
ok, so in what cases do you use xy and z? only when the callout to 3 datums?
Well, if you are measuring a hole, WITH surface sample hits, and report XYZ axis for the hole, the TP results will be 3-D TP, unless you tall it to use PERP to CL for the TP dimension. I can 'see' where this would be needed. OK, take a sheet metal part, automotive, if you will, that has a hole in it. Also imagine a rod that needs to go through that hole, but that is not in any direct way attached to that part. So, you have a 'perfect' rod in space, then a sheet metal part (assembly) that has to allow this rod to pass, if the rod/hole or on funky angles to body axis (not 'square' to any body axis), then you would need to know the 3-D, or spherical TP of that hole to ensure that the rod would passs through it. Where-as if this rod is actually a bolt that has to pass through 2 parts, 2 parts that are assembled and this bolt ties them together, then the surface deviation does not matter, just the perp-to-cl does for BOTH holes to ensure that the bolt will go through them.
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.
As far as I know there is no such thing as spherical TP. There is however, such a thing as a spherical cut which can be controled by true position using more than 2 axis. That spherical cut must qualify as a feature of size, a spherical radius does not qualify as a feature of size though.
How about a tooling ball controlled with three basic dims and Tp callout.
Curious, how would you measure that?
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