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I am trying to read the GD&T Symbols like Concentricity, Perpendicularity using ezdxf parser on DXF Files. The GDT Symbols get read as TOLERANCE Entity and using the content attribute I have succeeded to find the tolerance value, GDT Type and the associated Datum. Is there a way I can find out to which measurement (for ex - Linear dimension), it is associated with ? For ex - In the image below, I am able to understand that there is a Concentricity Symbol, with tolerance 0.02 with Datum. I do not know what is the other circle being referred to (Concentricity being a feature dependent on two entities, one is the datum and the other unknown). I would want to know that the Concentricity is associated the the linear dimension phi 13.

enter image description here

You can find the DXF at this location Sample DXF File

Any help would be appreciated.

Anuradha
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  • Since this is tagged DXF is it not possible for you to share a sample DXF file with such an element? – Andrew Truckle Jan 21 '22 at 22:37
  • If I understand you correctly, are u asking me share a sample DXF File? – Anuradha Jan 24 '22 at 02:52
  • Yes that is what I am saying. – Andrew Truckle Jan 24 '22 at 05:01
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    Okay, I will upload – Anuradha Jan 24 '22 at 11:06
  • I have added the link for the DXF in the question – Anuradha Jan 24 '22 at 11:14
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    Thanks for sharing your file. I am afraid that it seems I can't provide a solution. I was hoping that your elements had XDATA (extended entity data) which might have had the handles to the linked elements. But they are plain entities. I admit I don't ful;ly understand all the technical terms you mention but can't you just find the smaller circle element that has the same centroid as the outer one? I am afraid I have to bail out on this one. Sorry I can't help. – Andrew Truckle Jan 24 '22 at 12:35
  • Thanks for trying, I will consider your suggestion to mathematically find concentricity. Thanks anyways for the effort. – Anuradha Jan 24 '22 at 13:24

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