【摘要】 利用三点定圆原理设计了一种测量工具，用以测量齿轮（奇数齿或偶数齿均可）齿顶圆直径和齿根圆直径，以便确定齿轮的各主要参数。使用方法简单、方便、精度适中、成本低，便于推广使用。更多还原

【Abstract】 This paper using a principle of three point defining one circle designs a measuring instrument which can measure addendum circle and dedendum circle diameter of gears (odd or even tooth number)and can define all main parameters of gears Features of this measuring instrumeat are usage being simple and conveninet, accuracy being middle, cost being low and poputarile and use being convenient更多还原