Method and device for detecting contact between a tool and a workpiece clamped on a processing machine
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United States of America Patent
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N/A
Issued Date -
Jan 2, 2003
app pub date -
May 15, 2002
filing date -
Jun 28, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Method and device for determining contact between a tool and a workpiece clamped on a processing machine. A signal, such as a high-frequency electrical current signal or an acoustic signal, is supplied between a location at the tool and a location at the workpiece. For as long as the tool and the workpiece are not in contact with each other, the signal has a specific amplitude. As soon as the tool and the workpiece make contact with each other, the two locations are additionally connected through a resistor connected parallel to the resistance of the machine. Thereby the amplitude changes significantly. The process can be performed manually and automatically. It can also be employed at a quasi-standstill of tool and/or workpiece, but also when the elements are moving.
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