孔与孔之间保持正确的中心距离,是某些机械零件主要技术要求之一,尤其在卡具制造中的卡具体更为重要。在目前我们还缺乏特别精密的卡具镗床,(JigBoring)所以在卡具制造上更造成困难。我厂工友曾创出一种很好而且很简单的办法,如1图所示,工作物过去我们是先依划线镗①孔的小孔( Maintaining the correct center distance between holes and holes is one of the major technical requirements for some mechanical parts, especially in the manufacture of clamps. At the moment, we still lack the special precision jig boring machine (JigBoring) so it is more difficult to manufacture the jig. Our factory workers have created a very good and very simple way, as shown in Figure 1, the work in the past we are boring according to the first boring hole ① hole (