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Thread: Does #Rule 1 is applicable for Orientation of Surface ?

  1. #1
    Associate Engineer
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    Oct 2015
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    Confused Does #Rule 1 is applicable for Orientation of Surface ?

    Does # Rule 1 is applicable for orientation of surface like perpendicularity of surface, parallelism of surface and angulairty of surface? please let me know

  2. #2
    Technical Fellow Kelly_Bramble's Avatar
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    Feb 2011
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    Yes, there are applications where Orientation Tolerance boundaries are contained within the specified limits of size tolerance boundaries for an associated surface unless otherwise specified (ASME Y14.5-2009).

    To be specific think of a cube where the bottom surface is specified as datum "A" and a limits of size is specified left-right surfaces +/- 0.3 mm. Then a perpendicularity of 0.2 mm relative to datum "A" is specified for the right side surface.

    The as-manufactured right side surface must fall within the tolerance boundaries defined by the limits of size (Rule #1) and the perpendicularity tolerance boundaries of the as-manufactured right side surface must also fall within the tolerance boundaries set forth by the limits of size. When considering limits of size specification for a hole or similar feature of size relative to a planar perpendicular Datum feature – then no there is not an applicable limits of size for which the perpendicularity tolerance boundaries must fall within. Application specific…
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Associate Engineer
    Join Date
    Oct 2015
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    Ok, thank you for the clarity..

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