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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Caemgen over 1 year ago

Measure a series of circles rather than a cone or sphere.

I'd measure the sphere first, zero it, and then take circles at different planes outputting the runout from those, if I had to do this and had enough sphere arc-length to pull it off.
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Caemgen over 1 year ago

Measure a series of circles rather than a cone or sphere.

I'd measure the sphere first, zero it, and then take circles at different planes outputting the runout from those, if I had to do this and had enough sphere arc-length to pull it off.
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KatmandudaMeow over 1 year ago in reply to Caemgen

you would need to calculate the IJK and/or vector approach if you did this though correct?
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Matthew D. Hoedeman over 1 year ago in reply to Caemgen

well, no. You would need to if you were going to do a profile-type dimension, and it wouldn't be circles as a circle will only ever measure in a plane.
But for runout (which is a circular result) a series for circles on the sphere would tell you if it were running out. That being said, if your machine has a lot of drift in it, it wouldn't give you very good results, the machine needs to stay at the same singular axis (one axis MUST stay the same) to get good results. If you were doing circles in the Z plane, the machine needs to stay at the same Z value for all the hits.
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