ONLINE TOOL WEAR SENSING AND COMPENSATION IN TURNING

The present work deals with on-line tool-wear sensing and the developm ent of a feedback-control system to provide compensation for the tool wear to keep the dimensions of the workpiece within the tolerance limi t, an optical displacement sensor being used for on-line monitoring of the tool wear. The positioning of the tool is performed by rotating t he cross-feed screw by a stepper motor, a microprocessor kit being use d as a controller. The width of the nose wear-land is measured with th e help of a shadowgraph and compared with that obtained from the senso r output. The principle, verified experimentally, indicates high accur acy of tool-wear measurement and compensation for different cutting co nditions. The proposed control device is quite simple and can be used in an industrial environment.