| 摘要 |
In a numerical control system of a machine tool wherein a servo-system for driving tool, table etc. is controlled by a control instruction signal expressed by a given function equation, there are provided a control instruction signal generator which generates a signal representing a control instruction value, a correction device for producing a correction signal corresponding to a phase lag angle of a servo-drive system for driving a working shaft and a correction device for correcting the control instruction value in accordance with the correction signal.
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