Circularity is a condition where any point of a feature's continuous curved surface is equidistant from its centre, which lies in the same plane.
The tolerance of circularity controls the divergence of the feature, and the annular space between the two coplanar concentric circles defines the tolerance zone, the magnitude being the algebraic difference of the radii of the circles.
Product requirement the periphery of any section of maximum diameter of the sphere must lie between concentric circles a radial distance 0.001 apart in the plane of the section.
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