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用三针量法在立式光学计等量仪上测量牙形角平分线垂直于螺纹轴线的圆锥螺纹(正文中简称圆锥螺纹),其中径计算公式[1]d_2=M/(cosβ/2)-d_m(1/(sinα/2)+1/(cosβ/2))+P/2 ctg α/2(1-tg~2 α/2 tg~2 β/2)是近似公式.本文探讨了其准确度。
Using the three-point method to measure the taper thread perpendicular to the thread axis (abbreviated as taper thread in the text) on the vertical optical instrument, whose diameter is calculated by the formula: d 2 = M / (cos β / 2 ) - d_m (1 / (sin α / 2) + 1 / (cos β / 2)) + P / 2 ctg α / 2 (1-tg ~ 2 α / 2 tg ~ 2 β / 2) is an approximate formula. Its accuracy.