在我厂生产的产品中,有的零件要求两孔中心距有不同的公差(±0.03～±0.10mm)。对于使用多年的机床,靠工作台的移动,难以保证两孔中心距的公差。过去,我们采用先加工好一个孔,然后用心轴定位,心轴与孔为间隙配合,试镗另一个孔,待中心距控制在公差范围之内再锁紧工作台。采 In my factory production of products, some parts require two holes center distance with different tolerances (± 0.03 ~ ± 0.10mm). For many years of use of machine tools, by the movement of the table, it is difficult to ensure the tolerance of the center hole distance. In the past, we used to make a hole first, and then use the mandrel positioning, the mandrel and hole for the gap with the other boring test boring until the center within the control of the tolerance within the scope of locking the table. Mining