Abstract: The present disclosure relates to a device for machining a work-piece with a tool, including a tool receptacle for releasably clamping a tool, such as a hob peeling wheel, and a machining head, which is provided with the tool receptacle, and is designed to drive a tool clamped therein, and to move it relative to a work-piece to be machined, including an assessment unit for imaging and/or measuring a tool, or a part thereof, in order to detect the state of wear of the tool.