Circularity of Turned Cylindrical Surface

There are various definitions to speak of errors of product's form. Circularity is one of such definitions to estimate how close to an ideal circle the circular surface of a product is. Its evaluated value for a particular product is closely related to the dynamic characteristics of the employed workpiece-lathe system, not necessarily proper to the lathe itself. A method is proposed to process data and to obtain information about generated circularity and the above characteristics in cylindrical turning, with application to a practised example.