Servo feed system for electrical discharge machining apparatus
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United States of America Patent
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-
Mar 16, 1982
Grant Date -
N/A
app pub date -
Mar 26, 1979
filing date -
Mar 26, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The servo circuit is operable to monitor gap conditions on any number of working leads up to four at the same time. It further has the capability of responding to high voltage operating conditions and then reducing the gap voltage being sensed to an appropriate level. An analog stage is then employed to pick out the most valuable information being provided from the several gap leads. An amplifier of the FET type is used to provide high input impedance to the circuit. An absolute value circuit is further included which in either polarity will rectify the gap signal back to the positive level.
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