Analysis of Motion Errors of Linear Guide Pair Based on Parallel Mechanism

Abstract

This paper systematically summarized the technical state of art and research results on the motion error of a linear guideway, corrected some misconceptions, and further clarified the relationship between the straightness error of the guide rail itself and the motion error of the linear stage. Moreover, a new method based on parallel mechanism is provided to study the motion errors of the linear guide pair. The basic idea is to abstract the structural relationship between the stage and the guide rail into a 4-bar parallel mechanism. Thus, the stage can be considered as a moving platform in the parallel mechanism. Its motion error analysis is also transferred to moving platform position analysis in the parallel mechanism. The straightness motion error and angular motion error of the stage can be analyzed simultaneously by using the theory of parallel mechanism. Some experiments were conducted on the linear guideway of a self-developed parallel coordinate measuring machine. The experimental data and analysis verify the feasibility and correctness of this method.

Investigation of the transmission accuracy of ball screw considering errors and preloading level

“…In the study of transmission accuracy for the functional elements of machine tools, existing researches mainly involve linear guide, spindle and roller screw. Hu et al provided a new method based on the parallel mechanism to study the motion errors of the linear guideway, and developed the relationship between the straightness error and the motion error [4]. Choi et al proposed a modified volumetric error model that includes spindle error motions and geometric errors to predict the positioning errors at a given axis position [5].…”