Calibration of Three Dimensional Mechanism - Novel Calibration Method for 3DOF Parallel Mechanism -

Many types of three dimensional mechanisms (3Dmechanism) are used in modern industry. Specially, in automation technology, product engineering and robotics, 3D-mechanisms play the key roles of complicated manipulation, 3D positioning and 3D measurement. Usually, the repeatability of 3D-mechanism is tested and evaluated. However, when we use 3D-mechanism in wide purposes and in wide conditions, the absolute calibration is the key technique to control the mechanism precisely. In this article, we analyze theoretically the method of the absolute calibration for 3D-mechanisms, such as a Cartesian mechanism, an articulated mechanism and a parallel mechanism. After theoretical analysis, we introduce a novel 3DOF parallel mechanism for a coordinate measuring machine (CMM) and a micro milling machine and a novel calibration method for these parallel mechanisms.