Abstract
This study has proposed a coordinate measuring machine based on a three–degree–of–freedom parallel kinematics manipulator. This paper describes a kinematic calibration method using a passive prismatic joint with a linear scale unit. The scale unit measures change in distance between the moving platform and the machine frame when the platform moves in the workspace. The least square method using Jacobian matrix corrects 22 kinematic parameters so that the distance errors measured by the scale unit are minimized. The above calculations have been repeated in numerical simulations.
