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当螺栓(或者螺钉)折断在离开工件表面一定深度的螺纹孔内时,如何在折断的螺栓上钻削一个取出孔,这往往是比较困难的事情。这里介绍一种钻削取出孔的简易“钻模”。如图所示,取一件内六角固定螺钉,其螺纹规格应与折断的螺栓相同,把它夹在车床卡盘上,在其轴向钻一个通孔,孔的直径应小于内六方槽的对边尺寸。使用时,把改制成的“钻模”拧入折断的螺栓上面,然后在折断的螺栓上钻削取出孔。
It is often difficult to drill a hole in a broken bolt when the bolt (or screw) breaks in a threaded hole that is some depth away from the surface of the workpiece. Here is a simple “drill hole” for drilling holes. As shown in the figure, take a hexagon socket set screw with the same screw thread as the broken bolt. Place it in the lathe chuck and drill a through hole in the axial direction. The hole diameter should be smaller than the hexagon socket The size of the opposite side. Use, the conversion of the “drill” screwed into the broken bolt above, and then broken bolt drilling holes removed.