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Dimensioning a perfect sphere - is there a proper way?

Question asked by Josh Vanatta on Jan 28, 2015
Latest reply on Feb 1, 2015 by Josh Vanatta

Hello!

 

I came across a situation today that I've never encountered before. When making a detail drawing of a basic valve, the one part is a perfect sphere, with no holes grooves just a perfectly smooth sphere, and I was unsure how to dimension it properly. My concern is that in 2D a perfect sphere looks the same from every direction and the manufacturer might be a little confused seeing the exact same view two or three times. A couple quick searches provided no clear answer so I simply showed one view calling out the diameter and added a note saying "This part is a perfect sphere."

 

Is there a more proper way to do this, with maybe some sort of annotation or symbol to denote sphere-ism?

 

Thanks!

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