The radius of each section is equal to the ellipse pitch radius.The approximate elliptic gear can be made with numerical control 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。