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Thread: Flatness Actual Value

  1. #1
    Associate Engineer
    Join Date
    Dec 2017

    Flatness Actual Value

    Hi all,

    I would like to know what does "Actual value" mean in case of flatness.

    I understood the statement "A flatness tolerance specifies a tolerance zone defined by two parallel planes within which the surface or derived median plane must lie" in ASME Y14.5-2009. But, didn't come across the term in the specification.

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    "Actual Flatness" would be that flatness which is actually manufactured onto the surface in question.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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