Comprehensive study of an eccentric universal joint for parallel coordinate measuring machine

Abstract

Abstract Eccentric universal joint (U-joint) is a crucial component extensively used in parallel coordinate measuring machines. The workspace and stiffness are significant characteristics that can directly affect the measurement performance of the mechanism. To investigate the eccentric U-joint’s workspace, a mathematical model has been developed based on the geometrical parameters. The analysis explores the correlation between workspace and geometric specifications and compares the workspace of the eccentric U-joint with that of the traditional U-joint. Furthermore, a stiffness model for the eccentric U-joint is established, and its stiffness is analyzed using the finite element method. Finally, an experiment is designed to demonstrate the validity of the proposed model. The research lays the foundation for an engineered system that designs the desired eccentric U-joint.