Effect of Eccentricity on Roundness Measurement Accuracy for Cylindrical Components with Large Radius

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.