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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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  • Just like John said. Three basic dimensions give the location for the axial feature, the first datum in the FCF is the feature to which the axis is to be normal. Then look at the pic I posted demonstrating this (it does not include the FCF sorry). As far as TP to a point it is illegal. It doesn't matter if GM does it or Ford or Boeing or whoever. You can't TP a point, per the standard it needs to be a FOS. Does this mean you can not make PCDMIS do it? No. Does it mean you are misinterpreting it and design intent is not being met? No. Is it a bad callout? Per the standard it is.

    There are no exceptions that I know of in regards to the shape of the tolerance zone. The shape of the tolerance zone is dictated either by the shape of the feature or by basic dimensions (i.e. profile).
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  • Just like John said. Three basic dimensions give the location for the axial feature, the first datum in the FCF is the feature to which the axis is to be normal. Then look at the pic I posted demonstrating this (it does not include the FCF sorry). As far as TP to a point it is illegal. It doesn't matter if GM does it or Ford or Boeing or whoever. You can't TP a point, per the standard it needs to be a FOS. Does this mean you can not make PCDMIS do it? No. Does it mean you are misinterpreting it and design intent is not being met? No. Is it a bad callout? Per the standard it is.

    There are no exceptions that I know of in regards to the shape of the tolerance zone. The shape of the tolerance zone is dictated either by the shape of the feature or by basic dimensions (i.e. profile).
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