Patent ID: 6973861

Claim:
A lathe-cutting apparatus which performs lathe-cutting of an eccentric part of a crankshaft, said lathe-cutting apparatus comprising: a pair of supporting devices, each of which supports an end portion of the crankshaft; at least one rotational drive device which is provided at an end side of at least one of the pair of supporting devices, and which rotates the crankshaft around a main journal thereof so as to rotate the eccentric part; a tool which performs the lathe-cutting of the eccentric part; and a cutting tool drive unit which eccentrically rotates a cutting edge position of the tool synchronously with the rotation of the eccentric part; wherein the cutting tool drive unit is movable in an axial direction of the crankshaft and in a direction perpendicular to the axial direction while eccentrically rotating said cutting edge position of the tool.