Electric heating – Metal heating – Cutting or disintegrating
Patent
1990-08-14
1992-02-18
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6913, 219 6917, B23H 102, B23H 726, B23H 904
Patent
active
050896814
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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Evans Geoffrey S.
Spark Tec Limited
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