In a tool exchanger apparatus of a machine tool including a turret which turns around an axis inclining with respect to a vertical direction and which conveys tools, forces applied to tool gripping portions are calculated from a resultant force of a centrifugal force, gravity and an inertial force applied to each of the tools, using a weight and a position of each of the tools and a turning speed and a turning acceleration of the turret for each of turning phases when the turret turns, and the turning speed and the turning acceleration of the turret are determined for each of the turning phases.

A machine tool includes: a movable body that supports a tool; a feed drive unit that feed-drives the movable body; a numerical control unit that controls the feed drive by the feed drive unit to perform cutting by the tool; an acceleration sensor that is provided on the movable body and detects acceleration of the movable body; and a command unit that outputs a stop command to stop driving of the feed drive unit to the numerical control unit when the acceleration of the movable body exceeds a threshold value set in advance on the basis of an output of the acceleration sensor. The command unit sets the threshold value to a first threshold value in a cutting control state, and sets the threshold value to a second threshold value lower than the first threshold value in a feed control in a non-cutting control state.

A machine tool includes: a movable body that supports a tool; a feed drive unit that feed-drives the movable body; a numerical control unit that controls the feed drive by the feed drive unit to perform cutting by the tool; an acceleration sensor that is provided on the movable body and detects acceleration of the movable body; and a command unit that outputs a stop command to stop driving of the feed drive unit to the numerical control unit when the acceleration of the movable body exceeds a threshold value set in advance on the basis of an output of the acceleration sensor. The command unit sets the threshold value to a first threshold value in a cutting control state, and sets the threshold value to a second threshold value lower than the first threshold value in a feed control in a non-cutting control state.

A device for mechanical overload protection in a drive train of a machine tool, the drive train having an output side with an output shaft and an input side with a motor shaft. The output shaft is operatively connected to the motor shaft by way of a connector, the device for mechanical overload protection being formed by a press-fit connection between the connector-on the one side and the motor shaft or the output shaft on the other side. A method for producing such a device for mechanical overload protection in a machine tool is also provided. The peak torques in the drive train, which preferably occur for a short time, can be significantly reduced and the machine tool and its mechanical components can be protected from damage in the event of a blockage.

A device for mechanical overload protection in a drive train of a machine tool, the drive train having an output side with an output shaft and an input side with a motor shaft. The output shaft is operatively connected to the motor shaft by way of a connector, the device for mechanical overload protection being formed by a press-fit connection between the connector-on the one side and the motor shaft or the output shaft on the other side. A method for producing such a device for mechanical overload protection in a machine tool is also provided. The peak torques in the drive train, which preferably occur for a short time, can be significantly reduced and the machine tool and its mechanical components can be protected from damage in the event of a blockage.