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Thread: Datum on "angular slab" centerline?

  1. #1
    Associate Engineer
    Join Date
    Feb 2021
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    4

    Datum on "angular slab" centerline?

    Referring to the attached picture,


    1-Is it allowed to define such a DRF in the ASME standard?


    2-If it is, how should we materialize datum B for inspection?


    Thank you!
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  2. #2
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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    2,414
    If it's a surface - it can be a datum. This works as defined. Datum C can be simulated with two collapsing surfaces that are parallel to the engineering drawing graphics as specified. A CMM would make easy work defining the specified datum.

    Ultimately the datum plane C is resolved into a plane that is perpendicular to Datums B and A too complete the three dimensional coordinate system or DRF. The derived datum C from the simulator is rotated to achieve the correct DRF orientation.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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