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一、在一个工件中如图1,圆弧与两条相交直线相切,相切圆 R 与包角α值为一定值的情况下,相切圆 R 的圆心是随着 R 的大小而改变。二、测量此 R 时,首先将工件的两相交直线的包角α值通过万工显或其它仪器测出实际值来;然后利用实际包角α值绘制放大图 R_0,并做放大图R_0圆弧顶角(180°—α)的角分线如图2,在投影(?)上此角分线与影屏的座标线重合,通过测微器可得出α值来,α值并不是所测工件 R 的公差,而是通过α值计算求得 R 的公差和 R 值。
First, in a workpiece as shown in Figure 1, the arc intersects the two intersecting lines, the tangent circle R and the wrapping angle α value are constant, the center of the tangent circle R changes with the size of R . Second, the measurement of this R, the first workpiece angle of the intersection of the two intersects the value of α through the million workers or other instruments to measure the actual value; and then use the actual angle α value drawing magnified R_0, and do a larger map R_0 round Angle of the vertex angle (180 ° -α) of the sub-line in Figure 2, in the projection (?) The angle line and the screen coordinate line coincidence, can be obtained by the micrometer α value, α and Instead of measuring the tolerance of the workpiece R, the tolerance and the R value of R are calculated from the value of α.