Question

Advantages and disadvantages of non conventional machining process

Answer 1

advantages
1 they are non exhaustible
2 they are green fuels
3 they do not emmit pollutants
disadvantage
1 they produce less energy.
2 their set ups are very costly

Answer 2

advantages
they can be used without the tool contact with metal 
they are not concerned with strength of the metal and any extent of hard metal can be easily machined
they are used for machining which cannot  be done by conventional machining