George A. Mitchell Co.'s Push Pointers are hydraulically powered. Contoured gripper jaws hold the tube in place while drawing dies are successively forced over the end of the material reducing into a smaller diameter. A special Mitchell device guides the reduced end producing a straight and concentric point. This perfectly round point has a uniformly gradual reduction from the tube O.D. The resulting high tensile strength all but eliminates the loss of the point at the start of subsequent drawing operations. Wall thickness of the point is generally greater than that of the tube, but the point can never be closed solid. A center hole always remains in the point to permit free air passage during later processing.
Our Push Pointers are used in both the ferrous and nonferrous industries to accommodate pierced, extruded, tube reduced, welded, and previously drawn tubes. All pointing operations are done cold. Using jaws with a gripping surface specially developed for the purpose, ferrous tubes can be pointed in the pre-lubricated condition. This is a significant advantage — eliminating pickling and lubing after preheating that is usually required, especially for thick wall tubes, when other pointing methods are used.