Starting from the material properties of EDM wires, this article examines the process feasibility and selection boundaries of micron-scale optoelectronic metal parts: the technical basis of wire-cut EDM (WEDM-LS), wire material comparison, tungsten wire process essentials (tension, guiding, discharge parameters, dielectric fluid, multi-pass strategy), six typical applications — fibre-array V-groove moulds, hermetic optical-transceiver packages, lens barrels & iris blades, spectrometer slits & encoder discs, mould venting grooves and more — each with a dedicated illustration, plus a selection quick-reference and trend outlook.
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Starting from the 0.030 mm diameter class, this article explains why one tungsten EDM wire has no substitute in its specific range: the one-way tolerance design intent, a breaking load of roughly 2 N at 30 μm, straightness that enables auto-threading, three failure modes eliminated by uncoated single-material construction, engineered discharge characteristics, four irreplaceable scenarios, and a selection quick-reference table.
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