On-machine measurement of deep-hole accuracies

Abstract

On-machine measuring system of accuracies of a deep hole is developed using a lathe. The system consists of a laser interferometer set behind a head stock and the measuring head with a pentaprism and a corner cube prism. The corner cube prism is fixed to a stylus. The stylus scans a hole wall of a workpiece set on a carriage toward tangential direction. The movement of the stylus perpendicular to the hole wall is detected by the laser interferometer. A laser beam from the interferometer goes through a hole of the main spindle and is deflected by a pentaprism to the corner cube prism. Through the measuring experiments, it is cleard that hole accuracies,e.g.,roundness, straightness, hole diameter, etc. can be measured on machine using the sysytem.