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Thread: theoretically exact dimension question

  1. #1

    Join Date
    Apr 2020

    theoretically exact dimension question

    hi I want know theoretically exact dimension have tolerance

    Please see the file below

    Sorry for my bad english
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  2. #2
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    Theoretically Exact Dimensions (TED), also called a "Basic Dimension" should be viewed as dimensions that specify where the tolerance zone is located from which the as-manufactured feature may vary within.

    When a TED is specified there should be a geometric tolerance specification somewhere, such as:

    Within a note, or table referring to the specific dimension,
    Within a tolerance Frame (Feature Control Frame) clearly associated with the feature,
    A specified Associated Document or industry standard,
    with a general tolerance block specified on the engineering drawing.

    Your image came from ASME Y14.5-2009 therefore, See chapter 2, paragraph 2.1.1 "Application".

    When a geometric tolerance is NOT specified, then it can be viewed that the associated feature is established using tooling or gauge tolerances though this interpretation is not always clear.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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