Hello, I machined the chromium-cobalt specimen by ELECTRICAL DISCHARGE MACHINING (EDM) at 1 Ampere current and pulse on time (20µs, 60 µs, 150 µs and200µs) with constant PULSE OFF TIME (20µs) and VOLTAGE (140) VOLT. The EDM at a current of 1 A and pulse on time (60 µs, 150 µs and200µs), observed that the material was not extracted from the specimen or there is no machining of the specimens. Kindly suggest me, WHY EDM at a current of 1 A and pulse on time (60 µs, 150 µs and200µs) does not produce any machining effect on specimens.Thanks