Device (1) for
machining an elongated workpiece (2) such as pipes or other
metal semi-finished products by means of a
laser beam (3) circulating around the workpiece (2), comprising a
machine body (4), a holding element (5) rotatably mounted relative to the
machine body (4), an opening (6) enclosed by the holding element (5) through which the workpiece (2) to be machined passes during
machining of the workpiece (2), wherein the holding element (5) describes an enveloping surface (7) at least partially enclosing the workpiece (2) during its rotational movement, a
laser beam source (8) for generating the
laser beam (3), wherein the laser
beam source (8) is held by the holding element (5), characterized by that the laser
beam source (8) is arranged on the side of the holding element (5) facing away from the workpiece (2) during
machining, i.e. on the outside of the described enveloping surface (7), and that the holding element (5) is rotatably mounted by the
machine body (4) at at least two bearing points (20, 20a, 20b, 20c), the largest part of the holding element (5) running between the two bearing points (20, 20a, 20b, 20c) and a smaller part of the holding element (5) running beyond at least one of the two bearing points (20, 20a, 20b, 20c).