Method for machining through intermittent pulse-controlled electric discharges

摘要

Apparatus and method for machining a part by electric discharge from a succession of pulses comprising a switch, a voltage source and a resistor connected in series with an electrode, a Schmitt trigger for sensing the voltage across the resistor, a first monostable multivibrator connected with the Schmitt trigger and a second monostable multivibrator connected with the first monostable multivibrator and the switch whereby electric discharge is sensed by the Schmitt trigger, the first monostable multivibrator is responsive to the Schmitt trigger to control the duration of the electric discharge associated with each pulse and the second monostable multivibrator is responsive to the first monostable multivibrator to control the period between the end of the electric discharge associated with each pulse and the initiation of the next succeeding pulse.