Electric discharge machining apparatus

Details Electric discharge machining apparatus Electric discharge machining apparatus

1999-01-29

2000-10-10

Jackson, Stephen W.

Electricity: electrical systems and devices

Electric charge generating or conducting means

Use of forces of electric charge or field

361115, B23H 100

Patent

active

061308161

ABSTRACT:
An electric discharge machining apparatus for machining a workpiece by supplying a series of voltage pulses to a machining gap formed between the workpiece being machined and a tool electrode, comprises a machining power supply for supplying voltage to the machine gap; a switching transistor connected between the machining power supply and the machining gap for pulsing the output voltage of the machining power supply; a gate pulse generator is provided for generating a gate pulse signal having an ON time and an OFF time to control on/off switching operation of the switching transistor so that switching transistor is in non-conducting state when the gate pulse signal is OFF, a monitoring power supply is connected in parallel with the switching transistor, and; a faulty transistor determination circuit is provided which determines if a switching transistor has failed when current flows from the monitoring power supply through the switching transistor even though the gate pulse signal is OFF.

REFERENCES:
patent: 5352859 (1994-10-01), Kaneko et al.

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