sparkover-initiated discharge machining

sparkover-initiated discharge machining

[′spärk‚ō·vər i¦nish·ē‚ād·əd ′dis‚chärj mə‚shēn·iŋ]
(mechanical engineering)
An electromachining process in which a potential is impressed between the tool (cathode) and workpiece (anode) which are separated by a dielectric material; a heavy discharge current flows through the ionized path when the applied potential is sufficient to cause rupture of the dielectric.