Cutting tool wear monitor
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United States of America Patent
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Sep 22, 1987
Issued Date -
N/A
app pub date -
Feb 24, 1986
filing date -
Jun 18, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus by which the degree of wear and useful life limitations of a drill, end mill or other types of metal removal tools can be detected. The method is based on the short circuit current, open circuit voltage and/or power that is generated during metal removal by the utilization of an insulated rotary tool bit to which electrical contact is made by a non-rotating conductor and an insulated or non-insulated workpiece, with an external circuit connecting the tool and workpiece through a measuring device. The generated current, voltage or power shows a sharp increase or change in slope upon considerable tool wear and/or at the point of failure.
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