Turret tool rest and machine tool

A turret tool rest comprising:

• a main shaft to rotate a tool;
• a mill housing connection shaft into which the main shaft is inserted;
• a turret turning shaft into which the mill housing connection shaft is inserted, said turret turning shaft having a first coupling hole;
• a turret connected to the turret turning shaft via which the turret is rotated;
• a turret base configured to support the turret turning shaft, the turret base having a sub-base in which a second coupling hole is formed;
• a joint base fixed to one end of the mill housing connection shaft and provided between the first coupling hole and the second coupling hole in an axial direction along an axis of rotation of the turret turning shaft, each of the mill housing connection shaft, the joint base, the main shaft, and the turret turning shaft being disposed to rotate about a rotation axis of the turret;
• and
• an engagement member that moves axially so as to be able to engage either the first coupling hole or the second coupling hole,
• wherein when the engagement member is engaged with the first coupling hole, the turret together with the joint base and the turret turning shaft are rotatable with respect to the turret base, and
• when the engagement member is engaged with the second coupling hole, the turret together with the turret turning shaft are rotatable with respect to the joint base.

A turret tool rest comprising:

• a main shaft for rotating a tool;
• a mill housing comprising a mill housing connection shaft into which the main shaft is inserted;
• a turret turning shaft into which the mill housing connection shaft is inserted;
• a turret to which one end of the turret turning shaft is fixed;
• a joint base fixed to one end of the mill housing connection shaft;
• and
• a turret base configured to support the turret turning shaft,
• wherein the mill housing is disposed inside the turret,
• wherein the joint base comprises an engagement mechanism configured to switch between coupling to the turret base and coupling to the turret turning shaft,
• wherein the joint base comprises a coolant block configured to supply a coolant to the turret, and
• wherein the turret comprises a flow path configured to allow the coolant supplied from the coolant block to flow therethrough.