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Thread: theoretically exact dimension question

  1. #1
    Associate Engineer
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    Apr 2020
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    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
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    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".
    etc.

    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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