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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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  • Like I said look at P 155 fig 5-62. Also picture two spheres or two tooling balls. A basic dimension between the two will constrain to a spherical tolerance zone as well so that makes two examples of constraining to a spherical tolerance zone using one basic dimension.

    For your other example coaxiality is specified as true position, there are zero basic dimensions for coaxiality. Just the same you can control a cylindrical feature with one basic dimension for true position purposes. one example would be a distance between two bores where one is the datum and the other needs to be at a set distance from it while also being parallel to it. One basic dimension with a TP FCF will get that done for you.

    There are no rules as to how many basic dimensions must be used to constrain a feature with a FCF although I would say your example of four basics would be over constrained.
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  • Like I said look at P 155 fig 5-62. Also picture two spheres or two tooling balls. A basic dimension between the two will constrain to a spherical tolerance zone as well so that makes two examples of constraining to a spherical tolerance zone using one basic dimension.

    For your other example coaxiality is specified as true position, there are zero basic dimensions for coaxiality. Just the same you can control a cylindrical feature with one basic dimension for true position purposes. one example would be a distance between two bores where one is the datum and the other needs to be at a set distance from it while also being parallel to it. One basic dimension with a TP FCF will get that done for you.

    There are no rules as to how many basic dimensions must be used to constrain a feature with a FCF although I would say your example of four basics would be over constrained.
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