Machine tool

A machine tool for machining a workpiece, by means of a cutting tool, the machine tool comprising:

• a first holding device installed in a machining chamber, the first holding device being for holding a tool;
• a second holding device installed in the machining chamber, the second holding device being for holding the tool, the second holding device configured to move independently of the first holding device to change a position of the second holding device;
• a storage unit for storing one or more tools;
• an exchange mechanism for exchanging the tool and another tool of the one or more tools between the second holding device and the storage unit, the exchange mechanism being unable to directly access the first holding device;
• a robot for picking up the tool and for mounting the picked-up tool;
• and
• a controller for controlling driving of the first holding device, the second holding device, the exchange mechanism, and the robot,
• wherein
• the exchange mechanism exchanges the tool and the another tool of the one or more tools between the second holding device and the storage unit without involving the robot,
• the second holding device is a tool main spindle that holds the cutting tool as the tool,
• the exchange mechanism is an automatic tool changer including at least one of an exchange arm and a robot arm,
• the first holding device is a tool post that holds the cutting tool as the tool and is movable along a first direction and a second direction that is orthogonal to the first direction,
• the controller performs control such that the tool and the another tool are moved to and from the first holding device and the storage unit via the robot, the second holding device, and the exchange mechanism, and
• the controller is configured to control the robot such that the robot picks up the tool from the first holding device and mounts the picked-up tool on the second holding device, and the controller is further configured to control the robot such that the robot picks up the tool from the second holding device and mounts the picked-up tool on the first holding device.