A device and a method are proposed for de-rinding or trimming a piece of meat or piece of a slaughtered animal, in which an arrangement device for the arrangement of the piece, an industrial robot with a manipulator arm and a sensor system, which detects the part that is to be separated, are provided. The sensor system comprises a camera and an image processing system as well as, if necessary, a distance measuring system, which determines the distance between a predefined zero point and a measuring point on the surface of the piece. Further, a cutting tool is provided, which separates the part from the piece.