Electro-discharge machining apparatus
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United States of America Patent
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-
Feb 18, 1992
Issued Date -
N/A
app pub date -
Aug 14, 1990
filing date -
Mar 14, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An electro-discharge machining apparatus includes an electrode carrier on which there are mounted a plurality of separate electrodes. A circuit for each electrode applies a high voltage discharge initiating pulse followed by an extended lower voltage discharge sustaining pulse to the associated electrode. A gap voltage sampling circuit samples the voltage between the electrode and the workpiece and a 'low wins' circuit passes a signal representing the lowest gap voltage as a feedback signal for a servo-actuator which moves the electrode holder towards and away from the workpiece.
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