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 Material removal rate, MRR?
Material removal rate, MRR calculator uses Material Removal Rate = -(Proportionality Constant of MRR*Voltage at any Time t^2)/(2*Resistance of the Charging Circuit*ln(1-(Voltage at any Time t/Voltage of Power Supply))) to calculate the Material Removal Rate, The Material removal rate, MRR formula is defined as material removal rate is the rate at which the material is removed from the work metal. Material Removal Rate is denoted by MRR symbol.
How to calculate Material removal rate, MRR using this online calculator? To use this online calculator for Material removal rate, MRR, enter Proportionality Constant of MRR (Kmrr), Voltage at any Time t (Vc), Resistance of the Charging Circuit (Rc) & Voltage of Power Supply (V0) and hit the calculate button. Here is how the Material removal rate, MRR calculation can be explained with given input values -> 7.5E+7 = -(1.5*2^2)/(2*0.18*ln(1-(2/10))).