Abstract: A press brake milling machine comprising an upper way, a lower way and a carriage. The upper way includes a rail on which the upper carriage support shoes ride, and a rack for meshing with the gears of a carriage drive for advancing the carriage along the length of the upper way. The lower way includes a rail on which the lower carriage support shoes ride and a rack for meshing with the gears of the carriage drive for advancing the carriage along the length of the lower way. The upper way is attached to the upper moving slide member of the press brake and the lower way is attached to the lower bed member of the press brake. Mounted on the carriage is a cutter and a cutter drive. The carriage traverses the length of the press brake. While the carriage moves along the length of the upper moving slide member and the lower bed member, the cutter machines either the tool holding edge of the upper moving slide member or the tool holding edge of the lower bed member to straighten the edges thereof.