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Roundness

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A condition of a surface where:

(a) For a feature other than a sphere, all points of the surface intersected by any plane perpendicular to an axis are equidistant from that axis.

(b) For a sphere all points of the surface intersected by any plane passing through a common center are equidistant from that center1.

Also called Circularity

Geometric Symbol:

Circularity Symbol_bw

[1] Source: The American Society of Mechanical Engineers. 1994. ASME Y14.5M-1994 Dimensioning and Tolerancing. New York, New York.

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