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《计量技术》1987年第9期上刊有“增大弓高法的R最简计算式”一文。该文提出增大弓高只测A、B两点就行了,并给出在测凸四圆弧两种情况下的R计算式: R=(L~2+h~2)/(2h)±d/2实际上,式中的半弦长L是无法测准的。如果用转折点法来定B点的位置,由于所测圆弧半径较大,当h无明显变化时,L变化却很大。以R为50mm的圆弧为例,有式: L=±(2Rh-h~2)~(1/2)
“Measurement Technology” in 1987 No. 9 on the issue of “increase the Bow Rigid R-simple formula” article. In this paper, it is proposed to increase the bow height by measuring only two points A and B, and the R formula is given in two cases of the convex quadruple arc: R = (L ~ 2 + h ~ 2) / (2h) ± d / 2 In fact, the type of the half-chord L can not be measured. If the turning point method is used to determine the position of point B, since the measured arc radius is larger, when L has no obvious change, L changes a lot. Take R 50mm circular arc as an example, the formula: L = ± (2Rh-h ~ 2) ~ (1/2)