...Yu-Jia Hu; Yaoyu Wang; Weidong Zhu; Haolin Li Parametric expressions of equivalent stiffnesses of a ball-screw shaft are obtained by derivation of its geometric parameters, the finite element method (FEM), and data fitting based on a modified probability density function of log-normal distribution...

...Lu Lihua; Liang Yingchun; Guo Yongfeng; Shimokohbe Akira This paper presents the design and implementation of a positioning system with a dc servomotor and ball-screw mechanism used to realize high-precision positioning over a wide travel range with nanometer level positioning error and near zero...