Effect of misalignment on the cutting force signature in drilling

This paper presents a study which investigates the effect of misalignment between the axes of rotation of drill and the workpiece on the steady-state and dynamic of the axial cutting force and torque. A novel methodology has been proposed to measure the misalignment between the axes of rotation of the drill and the workpiece. This uses a laser-based system to measure this misalignment, where a reference beam has been generated by a laser tube, which is held in the chuck of the machine using a special enclosure. The laser beam is captured by a photo sensor camera having a video capture card. To study the effect of the misalignment, the starting bush was intentionally misaligned by moving the pressure head over the carriage using the lead screw of the cross slide.