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True Position in 3 axis???

1CMM4ME
Ok, I have read the post regarding this so called argument that my boss and I got into today. He told me that you cannot measure true position in 3 axis, as I told him he was wrong. I know it depends on the way the FCF calls it out, but I tried to explain to him that it is possible to measure TP in 3 axis.
I have seen the formulas, so I know it's possible. I just wish I could get one of you gurus to reply back explaining that it is possible and why. I see the picture but he does not. I do not like to get into pissing matches with upper management, but I have learned a h**ll of alot from you guys, and I know this is possible. So if one of you fine gentleman can back me up on this, I would very much appreciate it. Thank you very much.
Now I am going to get a cold beer.Smiley
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  • 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.
    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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  • 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.
    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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