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In mechanical manufacturing, the rotating parts are the most basic and most widely used parts, which are both mechanical and mechanical. With the rapid development of the mechanical industry from design structure to manufacturing technology, the requirements for the shape error of the rotating parts are becoming more and more strict, because it directly affects the matching precision, working precision, joint strength, friction, vibration and noise of the components. , sealing and life. Especially for parts that work under high precision, high speed, high temperature, high pressure and heavy load conditions, the accuracy of shape position error is more important. As a precision measurement of the roundness error of the main item of the shape error of the rotary part, it is increasingly being Pay attention to it.