Metal working – Method of mechanical manufacture – Shaping one-piece blank by removing material
Patent
1986-10-03
1988-08-02
Echols, P. W.
Metal working
Method of mechanical manufacture
Shaping one-piece blank by removing material
51103R, 744248R, B23P 1304
Patent
active
047606355
ABSTRACT:
A method of forming a ball screw member from an elongated workpiece having an outer cylindrical surface, as well as the ball screw member formed by the method. A helical ball screw thread is machined on the outer cylindrical surface, the helical ball screw thread having a helical groove and a helical crest surface. An end journal or other end treatment is formed in the workpiece, the end journal or other end treatment being located during the forming operation relative to the helical crest surface. Alternatively the end journal or other end treatment is formed in the workpiece and the helical screw thread is then machined while the outer cylindrical surface is located relative to the end journal or other end treatment during the machining of the helical ball screw thread on the outer cylindrical surface. The outer cylindrical surface of the workpiece may be centerless ground prior to the machining of the helical ball screw thread. The helical crest surface may be ground after the machining of the helical ball screw thread to provide increased concentricity between components of the ball screw member. A high precision ball screw member may be formed from the ball screw member by performing a regrinding operation on the helical groove, the regrinding operation being positioned relative to the helical crest surface.
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20th Century Machine
Echols P. W.
Rawlins Andrew E.
VanOphem Remy J.
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