Abstract: A numerical controller for a machine tool has a component inspection timing notification function for notifying a user of the timing for inspection of each individual component used in the machine tool. The numerical controller reads an inspection cycle, acquires the date of inspection and state quantity of the component, and calculates an amount of change in state quantity. If the amount of change in state quantity is larger than a predetermined threshold, the inspection cycle is changed. If not, the next inspection date is calculated based on the last inspection date and the inspection cycle. Then, the next inspection date is notified.

Abstract: Provided is a numerical controller for a machine tool having an efficient regular inspection function for components adjusted to the environment and condition of use of the machine tool. A state quantity for estimating the life of a component is measured and accumulated for each component, and a notification prompting inspection of the component is issued when a resultant cumulative value reaches a reference value. An inspection reference state quantity for determining timing for performing next inspection is renewed based on a result of inspection inputted by an inputting unit for inputting the result of inspection of the component.

Abstract: A numerical controller for a machine tool has a component inspection timing notification function for notifying a user of the timing for inspection of each individual component used in the machine tool. The numerical controller reads an inspection cycle, acquires the date of inspection and state quantity of the component, and calculates an amount of change in state quantity. If the amount of change in state quantity is larger than a predetermined threshold, the inspection cycle is changed. If not, the next inspection date is calculated based on the last inspection date and the inspection cycle. Then, the next inspection date is notified.