Control System for Axial Deviation of Holes in Deep Drilling. Deviation Mechanism and Various Factors for Deviation Ability with Control Method of Using Piezo Actuator.

Axial deviation of holes is a serious problem in deep drilling operation. As the results, the control system for axial deviation of holes in deep drilling was developed. The guide-pad on the new drilling tool head, the control pad, slightly moves up and down by piezo actuator in radial direction with each tool revolution. The axial deviation of the tool head is measured by in-process sensing system with laser and corner cub prism. This paper presents the development of the control method of pad using piezo actuator and the axial deviation mechanism by control pad is clarified. And it is verified various factors for deviation ability.