在气割及钻孔等加工时,常要先画出图线。现介绍一种简易等分圆的作图方法:如图1:已知直径为D的任意圆,以中心线同圆的交点O_3为圆心,D为半径画弧与另一中心线交于O_1、O_2两点。如图2:以O_4为端点作一弦AB(最好选一整数来计算)把A_ In the gas cutting and drilling and other processing, often have to draw the first line. Now introduce a simple method of drawing an equinox circle: As shown in Figure 1: an arbitrary circle of known diameter D, with the intersection of the center line and the circle O_3 as the center, D the radius of the arc and the other center line intersect O_1 O_2 two o’clock. Figure 2: O_4 as a string for the end of a chord AB (preferably an integer to choose) to A_