Machine tool comprising a machine spindle, a tool holder and a contact point for electric current or data transmission

A machine tool having a motor-driven machine spindle which can be rotated about a spindle axis and has an end-side tool holder, and having an inserted tool which is arranged exchangeably on the machine spindle and has a coupling element which is compatible with the tool holder of the machine spindle and has a rear face which points to the machine spindle, having an end face which comprises the tool holder and lies opposite the rear face of the coupling element, and having at least one co-rotating galvanic contact point for electric current or data transmission, which contact point is arranged between the machine spindle and the inserted tool and has a spindle-side contact element which is arranged on the end face of the tool holder and a tool-side contact element which is arranged on the rear face of the coupling element, characterized in that the spindle-side contact element and the tool-side contact element can be moved relative to one another, under the action of a centrifugal force component which occurs during the rotation of the machine spindle about the spindle axis, and can be pressed against one another with the production of contact.