Electric Discharge Machining(EDM)

• The tool is made cathode and the workpiece is made anode.there is a small gap between anode and cathode.
• A spark is produced by the discharge between anode and cathode through the gap and it is intermittent(not continues).
• Due to this spark,a higher temperature of 12000° centigrade which produce at that time and the material get vapourised.
• A dielectric fluid(Electrically non-conductive) is used to enhance the spark generation and it also clean the 'debris'(wast).
• A servo control mechanism is used to provide a constant gap between anode and cathode.

Specifications:

• Voltage-50V-200V
• Current-15A-500A
• Gap-0.025MM-0.075MM
• Tool-Copper,Graphite,Brass,Tungsten Carbide

Functions of dielectric fluid:

• Insulation between anode and cathode
• Cooling
• Cleaning

Eg:-Transformer Oil,White Spirit,Kerosene