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 Elapsed Time during Charging?
Elapsed Time during Charging calculator uses Time Elapsed for Charging Voltage = -Resistance of the Charging Voltage*Capacitance of Charging Voltage*ln(1-(Voltage at any Time for Charging Voltage/Voltage of Power Supply Charging Voltage)) to calculate the Time Elapsed for Charging Voltage, The Elapsed time during charging formula is defined as the time elapsed since the commencement of the task to provide sparking power to EDM electrode. Time Elapsed for Charging Voltage is denoted by te symbol.
How to calculate Elapsed Time during Charging using this online calculator? To use this online calculator for Elapsed Time during Charging, enter Resistance of the Charging Voltage (Rcv), Capacitance of Charging Voltage (Cv), Voltage at any Time for Charging Voltage (Vcv) & Voltage of Power Supply Charging Voltage (Vscv) and hit the calculate button. Here is how the Elapsed Time during Charging calculation can be explained with given input values -> 11.4336 = -1.8*5*ln(1-(7.2/10.01)).