The present invention provides a machine tool system including a machine tool body and a control device. The machine tool body includes: a cover that covers a machining region; chip expelling mechanisms that are disposed at a plurality of different positions inside the cover, that expel chips generated during processing, and a discharging ability of which is changeable; and a chip information obtaining unit that obtains information related to scattering directions of the chips during the processing. In accordance with the information related to the scattering directions of the chips and obtained by the chip information obtaining unit, the control device controls the discharging ability of one of the chip expelling mechanisms corresponding to a direction in which a largest amount of the chips have scattered so as to be larger than the discharging ability of another of the chip expelling mechanisms.