MACHINE TOOL

To provide a machine tool which can reduce an air consumption amount required for air purge.SOLUTION: A machine tool 1 includes: a first main shaft; a first headstock which is positioned on an outer peripheral side of the first main shaft with a gap Sk between the first headstock and the first main shaft and rotatably supports the first main shaft; air supply passages 56a, 56b which are formed to be connected to the gap Sk and has air passing from an air supply source 200; a solenoid valve 51 which is provided on the air supply passages 56a, 56b and can be switched between an open state in which air can be supplied to the gap Sk and a closed state in which the supply of air to the gap Sk is stopped; a pump 71 which can be switched between ON in which coolant liquid is supplied to a machining point of a workpiece and OFF in which the supply of the coolant liquid is stopped; and a control section 300 which controls the solenoid valve 51 and the pump 71 so that the open state and the closed state of the solenoid valve 51 are interlocked with ON and OFF of the pump 71.SELECTED DRAWING: Figure 7 【課題】エアパージにかかるエア消費量を低減することができる工作機械を提供する。【解決手段】工作機械１は、第１主軸と、第１主軸との間に隙間Ｓｋを持って第１主軸の外周側に位置し、第１主軸を回転可能に支持する第１主軸台と、隙間Ｓｋに繋がるように形成され、エア供給源２００からのエアが通過するエア供給路５６ａ，５６ｂと、エア供給路５６ａ，５６ｂ上に設けられ、隙間Ｓｋへのエアの供給を可能とする開状態と隙間Ｓｋへのエアの供給を停止する閉状態の間で切り替え可能であるソレノイドバルブ５１と、ワークの加工点にクーラント液を供給するオンとクーラント液の供給を停止するオフの間で切り替え可能であるポンプ７１と、ソレノイドバルブ５１の開状態及び閉状態を、ポンプ７１のオン及びオフに連動させるように、ソレノイドバルブ５１及びポンプ７１を制御する制御部３００と、を備える。【選択図】図７