The use of EDM process is in parallel to development of new technologies. One of these new technologies is small hole drilling by EDM.
Small hole drilling (d <2mm,>h/d > 10) is a huge technological problem. By drilling problems arise with chip transport and heat deviating. Drilling tough and rigid materials on depth is also a problem. By other non-conventional processes like laser and electron beam small holes can also be made, but these processes are still to expensive for common use. EDM is the best choice for machining electric conductive materials, especially for holes of uncommon shapes.
Technological problems arise:
- precision of electrode machining
- electrode positioning
- high dielectric liquid pressure
- electrical parameters selecting
- electrode guide
Figure: EDM small hole sinking design
Figure: Small hole made by EDM machining
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