Cutting tool wear monitor

Details Cutting tool wear monitor Cutting tool wear monitor

G - Physics

01

M

340/124

G01M 13/00 (2006.01) B23Q 17/09 (2006.01) G05B 19/4065 (2006.01)

Patent

CA 1243744

CUTTING TOOL WEAR MONITOR ABSTRACT A method and apparatus by which the degree of wear and useful life limitations of a drill, end mill or other types of boring or turning tools can be detected. The method is based on the short circuit current, open circuit voltage and/or power that is generated during drilling, boring, etc. by the utilization of an insu- lated rotary tool bit (17) to which electrical contact is made by a non-rotating conductor (37,39) and an insulated or non-insulated workpiece, with an external circuit (41,42) connecting the tool and workpiece (11) through a measuring device (43). The generated cur- rent, voltage or power shows a sharp increase or change in slope upon considerable tool wear or failure.

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