Electrical discharge machining power supply circuit

Details Electrical discharge machining power supply circuit Electrical discharge machining power supply circuit

B - Operations, Transporting

23

H

327/33

B23H 1/02 (2006.01)

Patent

CA 1162989

-12- CUT-OFF PROTECTION SYSTEM FOR ELECTRICAL DISCHARGE MACHINING APPARATUS Abstract A programmable system for controlling machining current magnitude and reducing it in a step function as gap voltage (10) 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 (18). 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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