In this paper, different features and application of modification works for old machine tool was analysed, and different control schemes with NC devices was given.
通过分析不同老式机床改造工程的特点和用途，提出了采用了不同数控设备的控制方案，并给出了相应的应用结果。
After the modification of step feed mechanism of deep drill combined machine tool, simplifying structure, convenient adjustment and reducing fault rate have been proved.
对深孔钻屑组合机床分级进给机构进行改进后，达到了简化结构、方便调整、减少故障的目的。
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