in a Blue Print drawings, what is the difference between R8 , SR8,and True R8

where R8 is the radius of a face

Accepted answer

R8 is the radius when it is shown without distortion - the axis is perpendicular to the sheet plane

True R8 is the radius when shown with distortion on the drawing - the axis is not perpendicular to the sheet plane, the radius appears elliptical on the drawing

SR8 is a radius for a spherical face (e. g. a ball)

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