迹字石油化工大學⊙ C The Machine is a Structural loop The structural loop contains all the joints and structural m e that position the tool wrt the workpiece A stick figure of machine motions can outline the structural loop The structural loop gives an indication of machine stiffness and accuracy Long-open loops have less stiffness and lann ann rn Structural loo X carriage Toopindle Workpiec Workpiece Fixture Fixture Y table XY tableC.The Machine is a Structural Loop • The structural loop contains all the joints and structural e l e m e n t s that position the tool wrt the workpiece – A stick figure of machine motions can outline the structural loop • The structural loop gives an indication of machine stiffness and accuracy – Long-open loops have less stiffness and less accuracy