Patent ID: 11953406
Assignee: OKUMA CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. An accuracy diagnostic method for a machine tool, comprising:
detecting a magnitude of a change in at least one of a state of a machine tool and a surrounding environment of the machine tool as a change amount;
recording the change amount;
predicting a future accuracy change of the machine tool using the change amount recorded at the recording; and
presenting a time point at which an absolute value of an accuracy change predicted from a base time point deviates from an acceptable value as a timing at which an accuracy adjustment is to be required for the machine tool based on the accuracy change predicted at the predicting, the base time point and the acceptable value;
recording a machine accuracy obtained by actually measuring an accuracy of the machine tool together with a measurement date and time;
determining an accuracy change predicting formula based on the machine accuracy, the measurement date and time recorded, and the change amount recorded; and
predicting the future accuracy change of the machine tool using the determined accuracy change predicting formula determined;
wherein (i) the determined accuracy change predicting formula is formed by including a change amount dependent component that changes by the change amount and an elapsed time dependent component that changes by an elapsed time: (ii) a change amount of the change amount dependent component in the accuracy change predicting formula is represented by a formula including a periodic function; and (iii) the change amount dependent component in the accuracy change predicting formula is represented as a formula including a function that increases a magnitude of a predicted accuracy change as an elapsed time increases.