在实物上划相贯线,常用展开法剪成纸样,贴在模型表面用铅笔划下来,然后进行铲削加工。这样做在装配时常不能达到密缝程度,有时遇到较复杂的形状,展开图也很难划,因而常常为此花费很多时间。现介绍一种简单易行的划线方法。一、找一块平板,在上面划出两管子的夹角轴线,并把主管和支管放在平板上,使中心线与平板上划的轴线重合。支管的一端可以稍 Planted in-kind line, commonly used method of development cut into paper, paste the model surface with a pencil down, and then shoveling. Doing so often can not achieve the degree of tightness in the assembly, sometimes encountering more complex shapes, expansion plan is very difficult to draw, so often spend a lot of time for this. Now introduce a simple method of crossed. First, find a flat panel, in which the angle between the two drawn axis of the tube, and the supervisor and the branch pipe on the flat, so that the center line coincides with the plank axis. One end of the branch can be slightly