Machine tool system

A machine tool system comprising:

• a machine tool;
• and
• a controller, wherein:
• the machine tool is equipped with a machine tool body and at least one temperature sensor that acquires temperature data of the machine tool body,
• the controller is equipped with a storage that stores time-series temperature data acquired by the temperature sensor, and an auxiliary power supply that supplies power to the temperature sensor and the storage when supply of power to the machine tool body is stopped,
• the controller controls the machine tool by using the temperature data over a predetermined time range stored in the storage, and selects, in response to a charge state of the auxiliary power supply, temperature data to be used in first control after the supply of power to the machine tool body is resumed, and
• in a case in which the charge state of the auxiliary power supply is equal to or lower than a first threshold when the supply of power to the machine tool body is resumed and in which a change in the temperature data over a latest predetermined time range stored in the storage is higher than a second threshold, the controller acquires the temperature data over a predetermined time range after the supply of power to the machine tool body is resumed, the temperature data capable of being used in the first control.