This machine is mainly used to remove the broken taps/drills/screws/reamers/plug gauge/bolts/fasteners etc.. without damaging to the thread and can machine small holes on any conductive metals such as alloy,harden,quenched,carbon steel, copper, aluminum etc.. 

This machine has the merits of small size and light weight, can be clamped to the big work piece to machine.

Portable edm drill machine is adopted the principle of spark erosion, can melt the metals without damaging to the thread/