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 Minimum Resistance from Charging Time?
Minimum Resistance from Charging Time calculator uses Minimum Resistance for Charging Time = Charging Time/Capacitance of Charging Time to calculate the Minimum Resistance for Charging Time, The Minimum resistance from charging time formula is defined as the minimum sum of inductive resistance and resistance of the sparking load in the discharging circuit. Minimum Resistance for Charging Time is denoted by Rct symbol.
How to calculate Minimum Resistance from Charging Time using this online calculator? To use this online calculator for Minimum Resistance from Charging Time, enter Charging Time (tc) & Capacitance of Charging Time (Cct) and hit the calculate button. Here is how the Minimum Resistance from Charging Time calculation can be explained with given input values -> 270.5714 = 18.94/0.07.