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I haven't done thins in a long time so I hope I am not leaving anything out, but from the CAD model, I would define space points all over that entire inner surface. Then under Resources, Utilities, select 3D best fit alignment. In that alignment select all the space points and best fit on CAD model. Then when you extract a radius you can change the alignment to the 3D best fit and in evaluation, constrain location for a radius result and constrain radius when checking position.
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Shabu,

I was given the following strategy from Megan Kelly, Zeiss Application Specialist. I'm not sure you'll be able to apply it to your current situation, but the idea is sound. As Jason alluded to, adding constraint seems to be the best way to measure radii in Calypso.


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RE: measuring radii
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Measure two 2-D lines on either side of your radius to be measured.
. 4532_2845a6b694bad036dd77e2d26a84ebbe.png


Then create a tangent construction with the lines as feature 1 and feature 2. Input the DIAMETER of the radius you’re trying to measure and toggle the position until the theoretical circle is showing where you want on the wireframe.
. 4532_8b09775d9f2fac57dbc3f8cc1fed2684.png

Ex: Tangent filled out correctly w/WRONG location
. 4532_f490e2f0bde1d497a420f784258b1d66.png


Toggle buttons to the left of diameter box until it looks right on your CAD.
. 4532_46d5c85ced34f87d82a3f15fbf5c7579.png


Then, create a non-theoretical circle feature, using formulas to control the location/diameter based on the tangent. Make sure your angle range is correct in the strategy.
. 4532_1b43d6f57eaccd1f7e6ad662993713b5.png


This will help the location be a bit more repeatable for the radius.

Hope that helped! Have a good week!

Best regards,

Megan Kelly
Appications Engineer
ZEISS Industrial Quality Solutions

Zeiss Industrial Metrology, LLC
Metrology Services
6250 Sycamore Lane North
Maple Grove, MN 55369, USA


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Jeff Frodermann
Meier Tool & Engineering
Anoka, Minnesota


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