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same piece varying concentricity

hey guys! I'm having trouble validating a measurement method. I am finding different values ​​of concentricity between two diameters. We have already tested leveling in different work planes and positions and the values ​​do not match when compared. in DCC mode I am always creating a plane and a cylinder, where I level and give origin to the cylinder and the plane is my height reference. In this cylinder that I level, I measure three diameters and after measuring them, I measure another larger diameter that is about 20mm away from them and I make the concentricity between them.depending on whether I place the piece lying down or standing up, changing my work plane, my concentricity varies from 0.070mm to 0.200mm. what do you think it could be?
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