Abstract: The modeling and identificat?on technologies for errors of machining center are studied, Based on the theory of multi-body system and charactcristic modeling method of position and geshire, the general volumetric error model of machining center is established, Based on the volumetric error model, a new displacemont tcchnology for the identification of geometric errors of machining center is proposed. Finally, ac-cording of the proposed modeling methods, the specific error model of a 3-axis vertical machining center is given, and its error identification resuits are obtained based on the new displacement method.

Key words: Multi-body theory, Machining center Voin melricerror model Geometric error identification