| 摘要 |
A numerical controller which has a plurality of command systems and controls a machine having a plurality of spindles, and in which a program can be prepared without taking account of the correspondence between the command systems and the spindles. The numerical controller has n number of command systems and controls a machine tool or the like that has n number of spindles and a required number of other axes. A signal indicative of the correspondence between each command system and a spindle is inputted from external signal input means to a selecting/switching section. The selecting/switching section selects, among the spindles 1 to n, a spindle of a destination such as a command S 1 for spindle control outputted by each command system in response to the input signal by software processing. The position of a tool or a workpiece to be machined can be changed in accordance with a change of the correspondence between the command systems and the spindles.
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