Electrical Discharge Machining (EDM) removes material through controlled spark erosion rather than mechanical cutting. That means no cutting forces, minimal tool deflection, and the ability to machine hardened tool steels, carbides, and intricate geometries that would be impractical with conventional CNC methods. Adding a C-axis introduces precise rotational control of the workpiece. Instead of indexing manually or re-fixturing, the part can be rotated in sub-degree increments while maintaining alignment within microns. This enables: • Multi-angle feature creation without repositioning error • True cylindrical symmetry in complex cavities • High-density micro-features distributed around a central axis • Reduced cumulative tolerance stack-up In mold making, this is critical. Insert features often dictate final part quality—especially for optical components, medical devices, and microfluidic systems. Surface finish, edge fidelity, and geometric accuracy directly impact flow behavio...