Patent ID: 6901828
Filing Date: 2005-06-07
Classification: B23B,B23Q,Y10T

Abstract:
1. A journal turning lathe for machining cylindrical work pieces comprising: (a) first and second clamping rings that are held in concentric alignment at spaced apart positions by a plurality of circumferentially spaced guide shafts, the first and second clamping rings adapted to surround and clamp to the cylindrical work piece; (b) a clamshell assembly slidingly supported on the plurality of guide shafts; and (c) a drive assembly for imparting controlled translational movement of the clamshell assembly along the plurality of guide shafts between the first and second clamping rings, the drive assembly including at least two circumferentially spaced lead screws journaled for rotation at opposite ends thereof in the first and second clamping rings, each lead screw having a traveling nut thereon operatively engaging the clamshell assembly at diametrically disposed locations, said drive assembly further including a drive motor operatively coupled to simultaneously rotate the at least two lead screws in unison whereby balanced forces are applied to the clamshell assembly at said diametrically disposed locations.