So I've read multiple post on this same question, but nothing really explains what PC-Dmis is doing that i saw.
I have a print for basically a cup. Its calling out concentricity of the outside of the part to a cylinder on the inside of the part( datum a is a larger cylinder at the top of the part on the inside)
The outside the diameters check out of location from 0 but its not matching the concentricity. (is the deviation still x2 as radial distance from center?)
Datum A is X = 0.00 Y= 0.00
OD is X= 0.0004 Y= -0.0013
Concentricity to A = 0.0218
Where did the 0.0218 come from?