The EDM drill passes current through a thin brass tube that arcs to the grounded workpiece. Flushing fluid allows the drill to evacuate burned material from the hole and create very deep, very small holes
Process Name
Drill EDM
Applications
Starter holes for wire EDM parts, high depth:diameter ratio holes, small holes in hard materials like carbide, removal of broken fasteners and taps
Advantages
Quick, simple setup, low cutting force allows holes to be drilled in delicate parts with minimal fixturing. Holes can be created at a much higher depth:diameter ratio than standard holemaking methods
Limitations
Dirty process, could contaminate a part intended for a cleanroom setting. Internal surface of the hole created is rougher than standard drilled hole
