Patent ID: 7069829
Filing Date: 2006-07-04
Classification: B23B,Y10T

Abstract:
1. A metal working machine for reboring or refacing a workpiece comprising, in combination: (a) an elongated, generally cylindrical boring bar, the boring bar having a longitudinally extending groove formed inward from an exterior surface thereof; (b) an elongated feed screw journed for rotation within said groove; (c) first and second helical gears coaxially mounted on the feed screw, the first helical gear being slidable on the feed screw and the second helical gear being threaded on the feed screw; (d) an annular cutting head assembly disposed about the boring bar and rotatable therewith, the annular cutting head member having a slide supporting a tool block that is adapted to be moved in a radial direction with respect to a longitudinal axis of the boring bar; (e) a radial feed screw journaled for rotation on the slide and engaging a nut affixed to the tool block and a first miter gear keyed to the radial feed screw; (f) a control shaft disposed parallel to the longitudinal axis of the boring bar and journaled for rotation in the cutting head assembly, the control shaft supporting a third helical gear that meshes with the first helical gear and a fourth helical gear that meshes with the second helical gear; (g) a connector shaft coaxially aligned with the control shaft and having a second miter gear keyed to it to mesh with the first miter gear; and (h) a lock mechanism slidable on the control shaft for selectively locking and releasing the third and the fourth helical gears whereby locking the third and fourth helical gears from rotation while driving the feed screw translates the cutting head assembly along the boring bar and releasing the third and forth helical gears for rotation while driving the feed screw drives the radial feed screw while maintaining the cutting head assembly stationary.