Check of allowable workspace of parallel machine tool is that the interference of parallel machine tool in processing is discriminated by the program,to ensure the safety processing of parallel machine tool.Research object is BJ-04-02 cross-legged parallel machine tool. On the basis of calculation of the bar length,limiting condition of the bar length,the around angle of moving hinge and the distance between two bars of allowable workspace of parallel machine tool is given,then the check calculation of allo...