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Conventional EDM, also referred to as Sinker EDM machining, like Wire EDM, uses spark erosion to machine blind cavities.

This process employs machined electrodes that produce sparks along the surface of the electrode to sink or plunge the cavity. The Conventional EDM process is ideal for a number of applications:

  • Blind Cavities
  • Intricate Details
  • Sharp Corners
  • Fine Finishes (Surface Finishes to 10 Micro-Inch)
  • Thin Walls and Cross Sections
  • Machining Threads into Hardened Parts
  • Blind Keyways
  • Internal Splines, Squares, or Hexes
  • Tolerances to +/- .0001”


Any conductive material can be Conventional EDM machined, including aluminum, brass, carbide, copper, hastalloy, inconel, steel, stellite, and titanium. RPG Industries has complete in-house electrode manufacturing capabilities.

Electrodes for Conventional EDM machining are generally made from copper, graphite, or tungsten depending upon work piece material and electrode wear requirements.