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 Proportionality constant for MRR?
Proportionality constant for MRR calculator uses Proportionality Constant of MRR = -(Material Removal Rate*(2*Resistance of the Charging Circuit*ln(1-(Voltage at any Time t/Voltage of Power Supply))))/Voltage at any Time t^2 to calculate the Proportionality Constant of MRR, The Proportionality constant for MRR formula is defined as the constant introduced to remove the proportionality from MRR equation. Proportionality Constant of MRR is denoted by Kmrr symbol.
How to calculate Proportionality constant for MRR using this online calculator? To use this online calculator for Proportionality constant for MRR, enter Material Removal Rate (MRR), Resistance of the Charging Circuit (Rc), Voltage at any Time t (Vc) & Voltage of Power Supply (V0) and hit the calculate button. Here is how the Proportionality constant for MRR calculation can be explained with given input values -> 5.8E-6 = -(74.69*(2*0.18*ln(1-(2/10))))/2^2.