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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.
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.
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