The eccentricity, difficult to adjust for components with a large radius, can lead to roundness measurement distortion. In this paper, the effects of the eccentricity and radius of components were simultaneously analyzed in the roundness measurement. The derived mathematical relationships between roundness measurement error, eccentricity and radius of components were represented graphically. Simulation results show that the larger the radius of components, the greater eccentricity is allowed for a constant roundness measurement accuracy. There is no need to decrease the eccentricity to obtain relatively higher measurement accuracy of roundness for components with a large radius. This is expected to provide insights into the future design and manufacture of large size alignment mechanisms.

偏心率很难适应大半径的零件，会导致圆度测量失真。本文在圆度测量中同时分析了零件的偏心距和半径的影响。圆度测量误差，偏心率和零件半径之间的数学关系用图形表示。仿真结果表明，部件的半径越大，偏心度就越大，以实现恒定的圆度测量精度。对于大半径的零件，无需降低偏心率以获得相对较高的圆度测量精度。预期这将为大型对准机构的未来设计和制造提供见识。