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在实际工作中,常常会遇到大半径元弧样板的测量问题。这些元弧样板的半径,有的达几十、几百毫米,这就给样板的测量带来一定的困难。一般说来,在投影仪上与标准图样比较,在工具显微镜上与标准轮廓线比较或用极座标测量,因为元弧半径大,通过一定投影或放大后,不能得到被测部位的全部轮廓,所以都是无能为力的。而一般测量元弧样板所使用的弓弦法,当弧长所对应的中心角小时,其测量结果的散发值又较大。
In practical work, we often encounter the measurement problem of the large-radius arc-arc model. The radius of these yuan arc model, some up to tens, hundreds of millimeters, which gives the measurement of the sample to bring some difficulties. In general, the projector compared with the standard pattern, compared with the standard contour on the tool microscope or polar coordinates measurement, because the arc radius is large, through a certain projection or enlarge, you can not get all the contours of the measured site , So are powerless. However, the bowstring method generally used to measure the arc-arc model has a larger distribution value of the measurement result when the center angle corresponding to the arc length is small.