The present invention solves the problems encountered by conventional machine tool devices when metals, plastics, composites or other materials are cut. The Sizing Tool is capable of precisely and permanently changing the shape of a tubular workpiece because, unlike conventional static spreaders, it repeatedly bends the workpiece back and forth many times to achieve the desired deformation. The Sizing Tool includes a set of revolving rollers (14) supported by bearings (13) and a mounting plate (12). The roller (14) is capable of engaging either the inside or outside surface of a hollow metal tube (10). The rollers (14) exert force on the end of the tube (10) having a circular cross-section in a configuration that resembles a polygon inscribed in a circle. As the rollers (14) are moved toward the workpiece (10), the workpiece is gradually deformed as it moves farther into the inclined surface presented by each roller (14). The dynamic flexure flaring method provided by the present invention enables a technician to work harden and produce precisely formed surfaces within a tolerance of one-thousandth of an inch which can be relied upon to maintain their shape over long periods of time. The Cutting Tool is controlled by an innovative tool advance assembly that converts translational motion to precise radial motion which governs the action of the cutting bit as it severs a tubular workpiece (10). The Cutting Tool is not only capable of cutting a tubular workpiece (10) from the inside out, but can also be configured to cut a tube (10) from the outside.