Accuracy analysis and error compensation for Tricept machine tool under load

This paper provides an efficient way to estimate the accuracy performance of the Tricept machine tool under load. Both joint clearances and link flexibility are considered. Clearances of the spherical joints and universal joint are considered, and the small change in link length arisen from clearances and deformation is modeled with the hyperbolic function. The kinetostatic model for accuracy analysis is obtained by balancing the employed load and the elastic forces provided by limbs. Moreover, an error compensation method for the Tricept machine tool under load is presented. The proposed methods are further illustrated and validated using a study case, and the feasibility of the error compensation method is discussed. This paper gives a deep insight into the effects of clearances, flexibility and loads on the accuracy performance of the Tricept-like mechanisms and instructive conclusions are drawn for accuracy improvement.