Flatness is the condition of a surface or derived median plane having all elements in one plane. In manufacturing and mechanical engineering, flatness is an important geometric condition for workpieces and tools. ( April 2009) ( Learn how and when to remove this template message) Please help to improve this article by introducing more precise citations. This might be overkill for some applications though.This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. Personally I think something like Y14.5-2018 fig 9-16 and para 7.24.10 would be an "ideal" solution, where either datum features or targets are utilized in conjunction with basic dimensions and a note combined with the limited area flatness tolerance - something along the lines of "DATUM FEATURES/TARGETS A, B, AND C ARE USED ONLY FOR ESTABLISHING ORIENTATION/LOCATION OF DESIGNATED LIMITED AREA". This would be unwieldy to say the least for rectangular limited areas/parts or a pattern of limited areas. I've also seen an elegant solution which worked in a specific case - it was a limited area on a cylindrical feature whose extent from an ID was controlled with a MIN dimension, that way if the entire area conformed it was acceptable, but at a minimum the limited extent must conform. I can see where someone could have trouble with those basic dimensions not being related and utilized in conjunction with applicable datum features, +/- dimensions would provide some relief of this - with all of the added ambiguity that comes with directly toleranced dimensions, especially with something that is not a tangible feature/boundary like a limited area. I've discussed this before and to me basic dimensions for size/location of a limited length/area seemed to be the most logical choice - especially since you're not actually determining conformance for the size/location of the limited length/area but the qualities of the area itself.
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