Device for detecting tool abnormality
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United States of America Patent
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-
Oct 23, 1984
Grant Date -
N/A
app pub date -
Sep 28, 1982
filing date -
Apr 23, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
When a drill is overloaded, while cutting a hole in a workpiece, a torque limiter disconnects the drill from a main spindle. As the drill is disconnected from the main spindle, the torque limiter generates high-level elastic waves. The elastic waves are converted by a transducer into a voltage signal. The level of the voltage signal is compared with a threshold value.
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