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我们自行设计制做了一套简单的检具,能很快地测出直径比较大的(如直径在一米以上的)孔径。现介绍如下。测量原理如图1所示。设直径为d的圆已知:BE=d,弦CD⊥BE,且CA=DA=α,AE=b。则 AB·AE=AD.AC即 (d-b)·b=a·a∴ d=(a~2+b~2)/(b) 测量方法如图2所示。被测孔1直径为d,测深千分尺2的测杆通过垫块3的小圆孔(测杆与圆孔的配合间隙比较小)进行测量,其中垫块的精度要求比较高,如图3所示。垫块的
We design a system to do a simple set of seizure, can quickly measure the larger diameter (such as the diameter of more than one meter). Now introduced as follows. Measuring principle shown in Figure 1. Let a circle of diameter d be known: BE = d, chord CD⊥BE, and CA = DA = α, AE = b. AB · AE = AD.AC (d-b) · b = a · a∴d = (a ~ 2 + b ~ 2) / (b) The measurement method is shown in FIG. The diameter of the hole to be measured 1 d, sounding micrometer 2 measuring rod through the small hole 3 of the spacer (measuring rod and the hole with the gap is relatively small) to be measured, wherein the spacer accuracy is relatively high, as shown in Figure 3 As shown. Pad