双球法测止端螺纹环规中径

The Two-Ball Method Used to Measure the Pitch Diameter of a "no-go'Thread Ring Gauge

本文分析了圆球法测量止端螺纹环规中径的接触状态,推导出判断球测头与螺纹牙侧是否产生非相切接触的判别式,并给出了误差计算公式。

This paper analyses the contacting status between the ball and the screw thread of a 'no—go' thread ring gauge when the pitch diameter is measured using two-ball method. A eualution method for discriminiton point of contact either on tangent state or not and a measuring error comptative fomuta are provide.