Abstract
Characteristics of machine tools, for example spindle run–out, thermal growth of spindle, lost–motion of feed drive, has become important problem to improve the machining accuracies for micro–precision die and mold. In order to solve such problems, new high accuracy machining–center has been developed to improve them. In this paper, we discussed the effectiveness of characteristic parameters on machining accuracies and confirmed that machining accuracies can be improved.