Laser-CCD Based Measurement System for Angular Motion of Integrated Machine Tools(Evaluation of machine tool performance)

Abstract

The study has been carried out to develop and evaluate a measurement system for the cutting tools angular motion (B-axis motion) relative to the chuck spindle in a mill-turn integrated machine tool. The B-axis Measurement Device (BMD) consisting of two modules, the laser module and the CCD module have been designed and developed. The laser module is attached to the tool spindle and the CCD module is mounted at the chuck spindle. The laser module has an optical fiber laser that can rotate along the same plane as the B-axis. The CCD module has two CCD cameras, and also a mechanism to rotate in the B-axis plane. Angular encoders measure the exact rotations of the laser and CCD cameras. By projecting the laser beam onto the CCD cameras, BMD evaluates the rotational accuracy of B-axis. The study has confirmed that BMD can successfully measure the B-axis accuracy with the resolution of 10 arcsec in the developed system.