Cut-off protection system for electrical discharge machining apparatus
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United States of America Patent
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Sep 11, 1984
Issued Date -
N/A
app pub date -
Mar 23, 1982
filing date -
Aug 21, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A programmable system for controlling machining current magnitude and reducing it in a step function as gap voltage falls indicating gap short circuit condition. A set of off-time numbers are computed and stored in an off-time counter. These numbers are recomputed each time a new on or off time is entered in the pulse generator. The original off-time is the normal cutting parameter. As the gap voltage drops, indicating problems, the off-time starts doubling or increasing in a like manner until it has reached many times its normal duration.
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