Abstract: A method of machining an oblong workpiece, which is placed substantially radially in a holding ring and is deformed by cooperation with a roller rotating in the holding ring. In connection with machining of a relatively large amount of material, the workpiece is caused to cooperate with a plurality of differently shaped areas on the surface of the roller. The method is performed by a machine which comprises a rotating holding ring for substantially radial retention of the workpieces. The machine comprises a rotating roller which is placed inside the holding ring and is adapted to machine the radially inwardly directed end of the workpieces. At least two differently shaped types of the machining areas are provided along the surface of the roller, said areas being so disposed that the various types are present radially opposite a workpiece in a predetermined succession at least at the same time as the holding ring performs a corresponding number of entire revolutions.