How the spark is produced in Electric Discharge Machining ?
A typical circuit used for supplying the power to an EDM machine is named as the relaxation circuit. The circuit consists of a DC power source, which charges the capacitor ‘C’ across a resistance ‘Rc’. Initially when the capacitor is in the uncharged condition, when the power supply is on with a voltage of Vo, a heavy current, ic, will flow in the circuit as shown to charge the capacitor.The relaxation circuit as explained above was used in the early EDM machines. They are limited to the low material removal rates for fine finish, which limits its application. This can be explained from the fact that the time spent on charging the capacitor is quite large during which time, no machining can actually take place. Thus the material removal rates are low.
How to Calculate Discharge Current?
Discharge Current calculator uses Discharge Current = Voltage of Discharge Current/Resistance of Discharging Circuit to calculate the Discharge Current, The Discharge current formula is defined as the current at any given time present in the discharging circuit and in the spark produced during EDM. Discharge Current is denoted by id symbol.
How to calculate Discharge Current using this online calculator? To use this online calculator for Discharge Current, enter Voltage of Discharge Current (VEDM) & Resistance of Discharging Circuit (RLS) and hit the calculate button. Here is how the Discharge Current calculation can be explained with given input values -> 2.5 = 0.75/0.3.