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我们知道,一个旋转体的任一质点都是围绕着旋转体轴心作圆周运动。根据这一准则,剖析图1:0为分度台圆心,O_1为被测件孔(或外圆)的圆心。分度台旋转时,O_1就围绕着 O 作圆周运动。当分度台旋转180°时,O_1处于 O′_1位置,O_1、O、0_1三点共线,OO_1=OO′_1,且 O 的座标为 O′_1、O_1两点的座标和的二分之一。由于三点的座标之间存在着这种关系,就可快速使被测件孔中心(O′_1或 O_1)与分度台 O 同心。具体方法:先把被测件置于分度台上,记下分度台读数,移动纵横向导轨,测量出被测件孔(或外圆)的圆心 O_1座标[(x_1+x_2)/2,(y_2+Y_2)/2],如图2。旋转分度台180°,同样测量出被测件孔(或外圆)的
We know that any particle of a rotating body moves circularly about the axis of the rotating body. According to this criterion, analysis of Figure 1: 0 for the index table center, O_1 for the hole under test (or cylindrical) center. When the index table rotates, O_1 makes a circular motion around O. When the index table rotates 180 °, O_1 is in the position of O’_1, O_1, O, 0_1 three points are collinear, OO_1 = OO_1, and the coordinates of O are O’_1, the coordinates of O_1 two points and the two One part. Because of this relationship between the coordinates of the three points, it is possible to quickly center the DUT’s hole center (O’_1 or O_1) with the index table O. Specific methods: first placed on the sub-degree test table, record sub-degree readings, move the vertical and horizontal rails, measuring the measured hole (or cylindrical) center O_1 coordinates [(x_1 + x_2) / 2, (y_2 + Y_2) / 2], as shown in Figure 2. Rotate the indexing table 180 ° and measure the hole (or the outer circle) of the DUT as well