单词arcograph
n.: (不用中心点画圆的)圆弧规
(不用中心点画圆的)圆弧规
The gear profile was designed with simple proximate drawing using proximate arcograph to instead of evolvent in the past.
齿轮齿形设计多采用简易的近似划法-用近似圆弧代替渐开线。