How can i measure the energy consumed during machining operation using a conventional lathe machine? I am aware there are energy analyzers but in situations where you cant afford such? what do you use?
Apart from energy meters and watt meters to capture current, what else can i use?
Good Evening ,
Please Refer this question
https://www.researchgate.net/post/what_is_the_Most_commonly_and_Reliable_method_to_measure_cutting_Energy_during_Machining_Turning_Milling_Drilling_process
Dear Mr. Ogedengebe,
Simple method is that you calculate the Power consumed for this process from Fc (cutting force) * cutting velocity (Vc) and then multiply it with the time taken to machine your entire job. This is the energy consumed.
There are also power cells to measure the spindle power required to machine a particular job and from this and the machining time you can get the actual energy spent for this process.
The more accurate term for calculating the energy requirement of any conventional machining process is the specific cutting energy. (i.e energy spent in machining an unit volume of material). This is calculated from the power and the MRR (material removal rate) of that particular process.
Hope you find the answer useful.
regards
Raghava Simhan.
I think you can calculate the power required to cut metal by the following equation:
Fz.Vc/61200 KW
Fz-tangential cutting force N
Vc-cutting speed m/min
61200 - conversion factor.
best regard
There are four ways you can measure/calculate the energy consumed during machining
(i) use a power meter and a stopwatch. Multiply the cutting power (measured by the power meter) with cutting time (measured by the stopwatch). But you have already declared that you do not have energy analyser or power meter.
(ii) use a three-axis cutting force dynamometer. Measure the three components of the cutting forces. Multiply the main cutting force with cutting speed/velocity. This will yield the cutting power. If you multiply cutting power with machining time, you will get cutting energy. But, please note that cutting force dynamometers are more expensive as compared to a power meter.
(iii) use an old-style 3 phase watt-meter. With such a watt-meter also you can measure the cutting power. Such watt-meters directly measures the phase currents, phase voltage and power factor and directly provide the power being drawn by the motor.
(iv) If you do not have access to watt-meter, try to measure the phase currents using ammeters. Measure the phase voltage separately. Assume a value of power factor for a three-phase induction motor (typical motors used in a conventional centre lathe). This will also provide you with the value of cutting power. Then determine the cutting energy as discussed earlier.
Nice explanation by https://www.researchgate.net/profile/Soumitra_Paul2