In precision manufacturing, micro-hole machining is one of the most challenging processes. With diameters typically below 1 mm, these holes demand extremely tight tolerances, roundness, coaxiality, and surface integrity. Micro-holes are widely used in medical implants, fuel injector nozzles, high-pressure fluid control valves, and micro-sensors. The small size leaves no room for error, requiring engineers to balance tool selection, machine stability, thermal deformation, and inspection methods to achieve consistent quality.