Machine tool system, and hydraulic liquid and processing liquid for machine tools

A machining tool system including a machining tool configured to operate in an environment in which a hydraulic fluid and a processing fluid used to process a processed member with the machining tool are mixed, the machining tool system comprising:

• a collecting means including a collection container for collecting the hydraulic fluid and the processing fluid after a lubricating effect ends in a mixed manner, the collecting means being disposed downstream of a lubricating flow path of the machining tool;
• a discharging container that communicates with the collecting means through a discharging flow path and stores the hydraulic fluid and the processing fluid in a mixed state;
• and
• a circulating means including a pump and an inlet port disposed in the discharging container at a predetermined height above a bottom portion of the discharging container for directly suctioning the hydraulic fluid and the processing fluid stored in the discharging container without separating the hydraulic fluid and the processing fluid into oil and water, and returning the hydraulic fluid and the processing fluid for reuse through a suctioning flow path to a supply flow path of the processing fluid, while blocking communication with a supply flow path of the hydraulic fluid.