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WolfMan
so. If i have a callout Profile .010. No datums.

Does that mean that I will not have min and max? Since the surface has no basics and can shift in any direction???

so in another words when i measure it, i would only get one value, example .005 and total profile .010?
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  • Yes, it will still have a min and a max. The nominal surface informs the tolerance zone, but thinking of it like your surface must be +/- .005 isn't really helpful. It's the tolerance zone that has the perfect shape of your nominal surface +/- .005, but your actual condition should have a min of 0 and a max of less than .010. The easiest way to think about it is a flatness tolerance on a plane. The exact same thing happens for a curved (non-size) feature.

    Things get funky for features of size that have profile with no datum structure though.
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  • Yes, it will still have a min and a max. The nominal surface informs the tolerance zone, but thinking of it like your surface must be +/- .005 isn't really helpful. It's the tolerance zone that has the perfect shape of your nominal surface +/- .005, but your actual condition should have a min of 0 and a max of less than .010. The easiest way to think about it is a flatness tolerance on a plane. The exact same thing happens for a curved (non-size) feature.

    Things get funky for features of size that have profile with no datum structure though.
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