| Electric Discharge Machining (EDM)
Electric discharge machining can only be used with conductive materials. The cutting is slow and can create micro-pitting. EDM can be automated but needs CNC programming and skilled labor. Also, this process requires a large capital investment. The tooling can be expensive and needs replacing with wear. It is more difficult to engrave contoured and interior surfaces.
Grinding
It is difficult to isolate area of material removal and therefore patterning of surfaces is limited. It is more difficult to grind contoured and interior surfaces and there is the potential for uncontrolled chipping. This is a slow process.
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