Abstract: A method and machine for preparing an annular workpiece from tube stock, using a part-off rolling tool. The rolling tool is advanced radially of the tube stock to a depth approximately equal to the desired bore diameter of the workpiece so as to partially sever a length from the tube stock. The inside of the length is then machined to the desired bore diameter. The machining either causes the length to be fully severed from the rest of the tube stock or leaves it connected thereto by a thin annular band. In the latter case the rolling tool is then advanced further to fully sever the length from the rest of the tube stock.