Development of a new artifact for the calibration of large scale instruments

A manipulator and a parallel robot is used as a Coordinate Measuring Machine (CMM) to be able to measure a large scale measuring volume. However an adequate artifact had not been developed yet. So in this paper, a new artifact to calibrate and certify a large scale CMM is proposed. The principle of this artifact depends on the double ball bar. The design of the artifact, and measuring result are presented. The accuracy of each part of this artifact is estimated in order to make the artifact more accurate.