Radius Not Enough % of a Circle

Most of our prints have radii that are impossible to measure accurate/repeatably because there is not enough % of a full circle:

I could use a polar radius, but isn't that essentially just Profile of a Surface to datums? And it would not be measuring per print.

Are there any other ideas that I'm missing? I've asked a few of the engineers to correct this on the print side of things, but I haven't been able to get through. At this point I'm just adding a report comment "THE FOLLOWING DIMENSION IS NOT ACCURATE."

Thanks for your input!

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0 Duane Wade 5 months ago

One of the things that I am thankful for is I am part of our DFM team. Short arc length radii are known issues with our team and we often will bounce this back to the customer and ask for profile of that surface or ask them to double whatever tolerance they have given on the print and tell them the issues of CMM measurement of a short arc length radius. Form, fit and function are easily explained to our customers in this manner.
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0 Duane Wade 5 months ago

One of the things that I am thankful for is I am part of our DFM team. Short arc length radii are known issues with our team and we often will bounce this back to the customer and ask for profile of that surface or ask them to double whatever tolerance they have given on the print and tell them the issues of CMM measurement of a short arc length radius. Form, fit and function are easily explained to our customers in this manner.
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