Abstract: A device for internally deburring tubes and the like welded along a longitudinal seam includes an elongated main support body. A cutting ring is mounted in the main body adjacent to one of its ends and the ring projects outwardly from one surface on the body. Guide rollers are mounted in the main support body with two of the guide rollers spaced apart in the elongated direction of the body and projecting outwardly from the same surface as the cutting ring. Three additional rollers are located between the other two guide rollers and project outwardly from the surface of the main body opposite the one surface.

Abstract: In a device for rough turning and shaft turning of a workpiece, a cutting insert is provided with a main cutting edge followed by an auxiliary cutting edge. The main cutting edge is divided into a first main cutting edge functioning as a rough cutter followed by a second main cutting edge performing rough smoothing and then by the auxiliary cutting edge which provides the final smoothing. The first main cutting edge is set at a greater angle to the axis of the workpiece than the second main cutting edge which, in turn, is set at a greater angle to the axis of the workpiece than the auxiliary cutting edge.