Abstract：Based on the inverse thought,an approach is presented for the dimension synthesis of a 5-axis parallel machine tool to satisfy the requirements of workspace.Firstly,the orientation workspace of the parallel machine tool is described with the polar coordinate.Then,the extreme value expressions of distance between the joints on the moving platform and the joints on the fixed platform are obtained based on the requirement of workspace.Finally,the dimensional parameters of the parallel machine tool with better performance are obtained considering the strut force transmission performance.This approach provides a high reference value for dimension synthesis of the other parallel kinematic mechanism similar to it.
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