Machine tool with numerical control, which is a function for determining the recommended replacement time for a service component comprises

摘要

A controller for a machine tool, a operation command signal to the machine tool. The machine tool transmits a signal which indicates that the commanded operation is completed. The controller determines a response time of the operation as the time difference between the point in time at which the numerical controller outputs a operation command signal, and a point in time at which the numerical controller receives a signal from the machine tool. The response time of the operation exceeds a preset value, thus, the numerical controller determines that a corresponding service component has to be replaced, and it informs the user with a display unit, that is necessary, a replacement.