Patent ID: 8424426

Claim:
A device for boring a non-round hole, comprising: a first rotating shaft of cylindrical shape; a second rotating shaft that is stored inside of the first rotating shaft; a processing tool that is provided to an outer-circumferential face of the first rotating shaft to be able to project and retract; a cam that is provided to the second rotating shaft and presses the processing tool in a projecting direction; a first detection means for detecting a rotation angle and rotation amount of the first rotating shaft; a second detection means for detecting a rotation angle and rotation amount of the second rotating shaft; a first drive means for rotationally driving the first rotating shaft; a second drive means for rotationally driving the second rotating shaft; and a control means for controlling the first drive means and the second drive means based on the rotation angles and rotation amounts detected by the first detection means and second detection means, respectively, wherein the control means includes a processing tool control means for controlling projection of the processing tool, and presses a base-end side of the processing tool by the cam and adjusts a projecting dimension of the processing tool by causing the first rotating shaft and the second rotating shaft to synchronously rotate, while causing a phase of the rotation angle of the second rotating shaft to advance or retard relative to a phase of the rotation angle of the first rotating shaft.