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Concentricity vs Coaxiality


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Would you consider this Concentricity? or Coaxiality? We are having a difference of opinion on this. 

Concentricity vs Coaxiality.PNG

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Concentricity describes how close the axis of two cylindrical or circular features are to each other. IMHO.

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If the length of the cylinder is longer than 3 times the diameter, it is evaluated in terms of coaxiality.
If the length is shorter than 3 times the diameter, or if there is an ACS symbol, it is evaluated in terms of concentricity.

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Can you offer a paragraph from international or national standard supporting the 3 times statement?

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I do not understand the difference between coaxiality and concentricity in your case ?

I this case, I prefer check straightness of the 2 axis in combined zone because the datum A is too short.

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Concentricity applies looking down the center axis, coaxiality applies when looking at it from the sides.

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I am not an ISO expert in any regards, but I am looking forward to the comments from the ISO community on the ACS interpretation.  I also don't understand why ISO coaxiality doesn't consider the outer tangential element condition of the considered feature.

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I'm in the same boat. As described, it looks like they are process controls more than anything else... 

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Thanks a lot for this video ! Never seen the ACS symbol 🙂

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Unfortunately, there is no paragraph in the international standard that implies 3 times.

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