Machining, Measurement, and Control Laboratory

Estimation of Three-dimensional Volumetric Errors of Machine Tools by a Laser Tracker
Soichi Ibaraki, Takafumi Hata, Tomoaki Yano, Toshiyuki Takatsuji, Sonko Osawa, Osamu Sato

The importance of the evaluation of three-dimensional volumetric accuracy of machine tools has been more widely recognized in recent years. A laser tracker is a laser interferometer with the mechanism to steer the laser direction to follow the target. Based on the triangulation principle, it estimates the three-dimensional position of the target, attached to the machine's spindle, by using four laser measurements from different tracker locations. This paper presents its application to the measurement of three-dimensional volumetric accuracy of a machining center. To improve its estimation accuracy, its major error sources are discussed.
Key Words: Laser tracker, measurement volumetric accuracy, machine tool