Hybrid servomechanism for micro-electrical discharge machining
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United States of America Patent
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May 7, 2002
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N/A
app pub date -
Apr 16, 1999
filing date -
Apr 16, 1999
priority date (Note) -
Expired
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Abstract
The present invention relates to an improved servomechanism for regulating the spark gap in micro electrical discharge machining (micro-EDM). The present invention utilizes a hybrid two actuator servo system for positioning the micro-EDM electrode. The hybrid system comprises a fast, easily controllable, short stroke actuator (such as a piezoelectric actuator) for good instantaneous response, and a second, slower actuator for positioning the fast actuator and for providing the required long stroke. This allows the slower actuator to 'feed' the electrode into the work-piece utilizing its long stroke, and the fast, short stroke actuator to respond quickly to instantaneous variations in the spark gap, such as short circuits.
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