Circular Runout on a Sphere

I was recently shown a drawing that called for Total Runout of a section of a sphere. Since this is not possible per the Standard, I recommended Circular Runout instead. However, I found out that PC-DMIS does not allow spheres for this control.

When I use a cone as an input feature, PC-DMIS allows it but doesn’t allow circles constructed ON the cone.

I read in the Help files that only circles with “surface data” can be considered as valid circle features for Circular Runout: an example of this would be a circle constructed on a Cylinder, but not a Cone or Sphere.

So, I have 2 questions:

Is Hexagon considering support for using a Sphere feature for Circular Runout?
What would be the best workaround for evaluating Circular Runout on a specific section of a Cone (or Sphere). Ideally, I’d be looking for multiple results for cross sections of my choosing.

Rob Jensen neil.challinor

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R2ah1ze1l over 1 year ago

If you were to pierce your measured sphere data with lines to construct points, you can take the created points and construct them into circles. Then your circle would have 'point data' to enable using the runout. Not sure how well that would work for you, but it works for me when needing runout of a diameter on a cone surface as opposed to if you intersect cone with a plane which always results in '0' for a reported runout value on the circle created.
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R2ah1ze1l over 1 year ago

If you were to pierce your measured sphere data with lines to construct points, you can take the created points and construct them into circles. Then your circle would have 'point data' to enable using the runout. Not sure how well that would work for you, but it works for me when needing runout of a diameter on a cone surface as opposed to if you intersect cone with a plane which always results in '0' for a reported runout value on the circle created.
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