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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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  • 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.

    Yes we have TP callouts here that locate a hole with basic dimensions to the intersection of that hole and a surface. However, the target zone is still cylindrical not spherical as the TP for the hole is controlling the axis not the intersection point of that hole and the surface. In other words the point you are talking about simply locates the target zone but is not the actual target zone if I am making sense here.
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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.

    Yes we have TP callouts here that locate a hole with basic dimensions to the intersection of that hole and a surface. However, the target zone is still cylindrical not spherical as the TP for the hole is controlling the axis not the intersection point of that hole and the surface. In other words the point you are talking about simply locates the target zone but is not the actual target zone if I am making sense here.
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