Importance

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Abstract

A tool tip conductivity sensor and method for determining when a tool tip of a machine contacts a workpiece. The sensor has at least two external connectors, one to the workpiece and the other to the machine. When the tool tip grazes the workpiece surface an electrical circuit is completed. The signal from the contacts is supplied to a trigger circuit, which preferably compares the signal to a DC offset. The trigger signal from the trigger circuit is supplied to a notification circuit, which provides a signal indicating contact. Preferably, the notification circuit receives the trigger signal and provides a steady 'On' condition for an LED or activates an audible device, such as a piezoelectric transducer. The notification circuit can also provide a reference for further machining to a controller of the machine using the sensor as a contact probe.

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First Claim