Aaccording to the forming principal of spherical surface,it makes the tuning axes of workpiece to forming angle with the turning axes of machine tool and composed incomplete sphere of turning ball spherical pin utilizing the movement of two ball.

• 根据球面形成原理 ,将工件回转轴线和刀具回转轴线形成交角 ,利用两个圆运动 ,合成转向球球销的不完整球面。