The radius of each section is equal to the ell ipse pitch radius.The approximate elliptic gear can be made with numerical cont rol milling machine or numerical control electromachining line machine.

• 且以每段圆弧上的圆弧半径作为各自的节圆半径，然后运用普通数控铣床或数控线切割机就可加工出近似的椭圆齿轮。