I was trying to develop an ECDM setup with following specifications:
Cathode: Copper of 1mm diameter
Anode: Graphite plate 16x16x5 mm3
Workpiece: Glass (quartz)
Cathode to anode separation: 30 mm
Electrolyte used: NaOH of 1 M concentration
Power supply: square pulses of 120 V with 60 kHz frequency
When power supply was connected across cathode and anode,the voltage was not rising beyond a particular value of 35 V.Hydrogen bubbles are forming but spark was not observed.
In case anyone has observed similar difficulty with ECDM operation and found out a solution, kindly help me regarding this.
Hi
This is not my field of competence (I am a mechnical engineer), but I happened to look at EDM for electric motor bearings and picked up some things, e.g. that there is a difference between positive and negative Corona. I believe the below links may help answer at least part of your questions.
https://en.wikipedia.org/wiki/Corona_discharge
https://en.wikipedia.org/wiki/Peek's_law
Hope this helps
Claes
You need set correct gap between electrodes and auto device for made them constant
He had bubles, so currency is on. May be lack of overall power?
I have not studied this process personally but the following publications may help. In these the electrolytes used are HCl, KOH, Sulfuric acid with somewhat high concentration.
http://publications.drdo.gov.in/ojs/index.php/dsj/article/viewFile/1812/899
http://www.iosrjournals.org/iosr-jmce/papers/sicete%28mech%29-volume5/44.pdf
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