パラレルメカニズムを用いた三次元座標測定機(続報) : リンク配置の検討と誤差解析

概要

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This study proposes a new coordinate measuring machine (CMM) based on a parallel mechanism consisting of closed loop link mechanism. The use of this mecha, nism will potentially improve the stiffness, accuracy and efficiencV. of the CMM This report describes link layout design for isotropic measuring resolutions. Moreover, error analysis was performed to obtain tolerances of various mechanical parameter errors. The obtained main results are as follows. (1) When three straight lines between three spherical joints and a probe tip are perpendicular to each other, the measuring resolutions become isotropic. (2) Overlapping between the struts and those lines, the resolution variatlon is minimized. (3) Increase of the base radius and decrease of the stage radius and the probe length reduce the resolution variation. (4) Maximum measurement error varies in proportion as the measuring length is multiplied by the parameter error.
公益社団法人精密工学会の論文
1999-02-05