A method of, and a device for, locating a piece with respect to a tool, utilize a measuring device for measuring a feeding speed, a driving direction and a feeding amount of the piece. The piece bears against two abutment rollers and is driven by a driving roller that is operated by a controllable motor operatively coupled to a machine numerical control apparatus. An output of the measuring device and an output of the controllable motor are both coupled to the machine numerical control apparatus.