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Thanks for the input!

Hey there guys, I need some advice here. Setting aside for a moment whether or not concentricity is the correct callout.. (this drawing is to the 2009 standard) Can Concentricity be used this way in the 2009? I was expecting to see A-B in the Concentricity datum A FCF, as well as the Ø12 FCF...

Great, thanks for all your help!

Thank you John! When it comes to reporting the deviation of the Ø8mm hole back to A... Is it correct that the hole's axis needs to fall in tolerance back to all 3 datum feature simulators (target areas in this case)? (or if I only put dimension X on the drawing, only the value back to datum A3...

Does that change if we use target areas instead? Are the target areas still treated as points even if they are planer themselves? Is this outlined somewhere in the 2009 standard?

Hi Alex, So the 3 Datum feature target points establish a datum plane at the resultant angle? (pic attached) https://files.engineering.com/getfile.aspx?folder=334c6b4e-4bec-46b5-878e-734c9f8d4a75&file=4-47_PLANE.jpg

Loving this forum and the great info you all share! I have a question regarding Datum Targets. In the 2009 standard, Fig 4-47 shows datum target points A1-A3 on different planes. How exactly are the four holes related to the Datum A target points? They wouldn't be perpendicular if A1-A3 are...