在不大的箱体零件上,应用钻模来加工中心距公差为0.01～0.15 公厘的精确孔时,颇为困难。因为需要制造精度高的钻模以及由于更换钻模而使得孔中心距产生误差。在成批生产情视下,而使用座标镗床是不经济的。 某些工厂,在金刚石镗床上和立式铣床上加工箱体零件上的精确孔获得很大 In the case of small box parts, the application of drilling to the machining center from the precise tolerance of 0.01 to 0.15 mm hole, it is quite difficult. Because of the need to create high-precision drilling die and due to the replacement of the die hole center distance error. In mass production, it is uneconomical to use a jig boring machine. Some factories, in the diamond boring machine and vertical milling machine parts on the box to obtain the precise hole is very large