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Thread: Referencing .STEP file as Basic Geometry

  1. #1
    Associate Engineer
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    Jan 2015
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    Referencing .STEP file as Basic Geometry

    Hello,

    I have searched in the Y14.5-2009 standard and online and have not been able to find an answer to this question. Is there a way to reference a step file as basic geometry to apply a profile of a surface tolerance?

    The main purpose is to define a tolerance zone for surfaces with compound curves and other shapes which are not straightforward to dimension. I would expect that these parts would be inspected with a cmm, but could also be inspected (very tediously) using manual means. I would use datums to orient the step file geometry.

    All of my searches point me to adding GD&T callouts to step files, which is not what I'm trying to do.

    Is there an accepted means for referencing step files through gd&t?

    Thanks,
    Mike

  2. #2
    Project Engineer
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    May 2011
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    Check out paragraph 8.2 of the Y14.5 standard. In the middle it says that "a digital data file or an appropriate view on a drawing shall define the true profile." Most of us are used to having the true profile be displayed/dimensioned on the view itself, but it does allow for a digital file.
    They don't say exactly how to communicate such a thing, but I imagine it would be via a note referencing the CAD file or whatever.

    Maybe I'm just rehashing the other stuff you saw; you can follow-up with more questions if I'm off-base..
    Last edited by Belanger; 01-09-2015 at 07:45 PM.

  3. #3
    Technical Fellow Kelly_Bramble's Avatar
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    Typical notes on an engineering drawing referencing the 3D/2D cad Model.



    1. Use 3D CAD Model as Control Master for Shape Reference.
    2. This is a Limited Dimension Drawing, Unless Otherwise Specified, Feature Geometries Are Governed By The Electronic Database. Tolerance of Electronics Data Base Features Shall be +/- .XXX.
    3. Untoleranced Features are Defined in the Digital Database CAD File # XXXXXX

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