The invention relates to a device with a spindle (10) for a machine tool, with a tool holder (30) and a driver ring (20) that is rotationally fixed on the spindle (10) and can be displaced along a rotational axis of the spindle (10). The spindle (10) and the tool holder (30) comprise matching faces which are designed to form a frictionally engaged connection when assembled. The opposing faces of the tool holder (30) and of the driver ring (20) have matching contours (21, 33) so that the driver ring (20) can engage on the tool holder (30).

Disclosed is a built-in type electric driving system of a machine tool. The system is capable of directly connecting a motor, which drives a spindle in a lathe which processes a workpiece, to an outer surface of the spindle without using a belt to rotate the spindle, and is capable of selectively transferring the power of the motor to a rotation system including a drawbar and a spindle for driving a chuck using a clutch device.

A connection device for connecting a tool holder (4) to a drive unit (2), which are provided on adjacently opposite contact surfaces with a serration (124, 56) each, which can be brought into engagement with each other and having a retraction device (90, 118), which reduces an axial distance between the serrations (124, 56) until they are in contact with each other.

A tool has a tool housing with an interface configured for coupling with an interface of an output housing and for coupling with a coupling module. The tool interface is configured for releasably fastening the output interface and the coupling module to the tool, wherein the tool interface is configured, with the output interface, to bring about centering and anti-rotational securement of the output on the tool. The tool interface has coupling elements configured to interact with the coupling module to axially brace the tool and output for securing the output on the tool in order to be able to process at least one workpiece with the processing element.

Disclosed is a built-in type electric driving system of a machine tool. The system is capable of directly connecting a motor, which drives a spindle in a lathe which processes a workpiece, to an outer surface of the spindle without using a belt to rotate the spindle, and is capable of selectively transferring the power of the motor to a rotation system including a drawbar and a spindle for driving a chuck using a clutch device.

A coupling device for the force-related connection of a device for machining pipes or pipe ends to a drive device is provided. With the aim of a high degree of variability, the coupling device has at least one force transmission device with at least one force transmission element for transmitting rotary forces to at least one force absorption element of at least one force absorption device with respect to a drive axis, wherein the at least one force transmission device is configured to be brought into connection optionally and alternately with force absorption devices which each differ in design with respect to the force absorption elements thereof and preferably differ in design with respect to a center distance between the force absorption elements.

Provided is a cutting tool including: a head portion which includes an insert mounting seat on which a cutting insert is installed; a shank which is installed on the rear end side of the head portion and holds the head portion; and a bolt which fixes a position of the head portion with respect to the shank when the head portion is mounted on the shank. The head portion is configured to be mountable to the shank, with the angle thereof changing around a center axis.