When should I choose Wire EDM WEDM instead of ram EDM?

Wire EDM WEDM is the preferred process whenever the geometry requires a through-profile, such as one-piece hardened blanking punch and die assemblies, extrusion dies, through-keyways, stacked burr-free shim packs, and intricate gears that can be sliced from hardened stock without cutter deflection. Ram EDM is mandatory whenever the feature consists of a blind cavity where a wire cannot pass completely through the workpiece, including injection mold cavities, blind hexes, internal blind splines, and internal threads orbited into hardened steel or solid tungsten carbide.