在厚钢料上钻小孔在工作间里,要在一块厚的材料,上钻通一个直径很小的孔,是一椿很困难的事。因为钻头太细,钻的孔又太长,稍微不小心,就会把钻头扭断。克服这个困难,一般是在材料的两面对着钻。但是用这个方法,钻出来的两面孔,往往不能准确。这里介绍一种两面钻孔的好方法: Drilling holes in thick steel In the workplace, drilling a small diameter hole in a thick piece of material is a difficult task. Because the drill bit is too thin, the hole in the drill is too long, and a little careless, it will break the drill bit. To overcome this difficulty, it is common practice to drill on both sides of the material. However, with this method, the two faces drilled can not be accurate. Here’s a good way to drill holes on both sides: