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Thread: Boundaries & there Purpose

  1. #1

    Join Date
    Jan 2023
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    Lightbulb Boundaries & there Purpose

    Hi All,
    I've seen plenty of methods to calculate certain boundaries per ASME Y14.5 2009. Can anyone share applicable engineering/design reasons these become very important to know?

    1. (Inner Boundary)
    2. (Outer Boundary)
    3. (Least Material Boundary)
    4. (Max Material Boundary)

    Keep it light & right.
    -Jeff

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
    Join Date
    Feb 2011
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    Bold Springs, GA
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    “Keep it light and right”

    Knowing where the as-manufactured materials boundaries are may be critical to fit and function and sometime form. Thin or thick – know it.

    Inner boundary – clearance or enough material for function (strength).

    Outer boundary - clearance or enough material for function (strength)

    Least Material Boundary – the worst-case boundary that exists on or outside the material of a feature(s) and is defined by the combined effects of size and geometric tolerances. applicable to a Datum feature only (LMC applies to a feature of size related to a datum).

    Maximum Material Boundary - the worst-case boundary that exists on or outside the material of a feature(s) and is defined by the combined effects of size and geometric tolerances. applicable to a Datum feature only (MMC applies to a feature of size related to a datum).
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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