Design of a Family of Ultra-Precision Linear Motion Mechanisms

摘要: The parasitic motion of a parallel four-bar mechanism (PFBM) is undesirable for designers. In this paper, the rigid joints in PFBM are replaced with their flexural counterparts, and center shift rotational pivots can be made full use order to compensate motion. First, three schemes proposed design family ultraprecision linear-motion mechanisms. Therefore, generalized cross-spring utilized as joints, six configurations obtained. Then, these configurations, compensation condition presented, space geometric parameters given. Moreover, characteristic evaluation implemented, an approach improve performances further proposed. addition, model developed parametrically predict primary Finally, analytic verified by finite element analysis (FEA), so mechanisms employed precision engineering.