A study on the motion accuracy of NC machine tools. (5th report). Diagnosis of angular motion error origins.

Diagnosis of the angular motion error origins in NC machine tools has been studied by using double ball bar test. Angular motion errors of the machine is represented by error vector, and the relation between error vector and motion error trace obtained at DBB test, was theoretically analyzed. Based upon this analysis characteristic trace patterns were defined in individual angular motion error origin. Diagnosis is carried out on by extracting these characteristic patterns from motion error trace which were measured by DBB test. The results show that this method has sufficient accuracy and convenience for machine shop use.