This paper discusses how to solve the stepless speed control problem of driven tool holders during the modification of economical CNC lathes with GSK980TDb system into turning-milling machine tools.%介绍使用GSK980TDb系统的经济型数控机床为了改造成车铣复合机床,如何解决动力刀座进行无级调速的控制问题.
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