In precision machining, surface roughness affects not only part appearance but also product longevity, friction behavior, and assembly fit. When design requirements reach Ra 0.2 μm or finer, standard cutting alone is insufficient. Achieving stable results requires process control combined with post-machining finishing techniques.

In precision metal machining, EDM (Electrical Discharge Machining) and CNC turning/milling (Computer Numerical Control) are two commonly used manufacturing methods. Each has distinct advantages and limitations, making the choice of machining method critical for part quality, lifespan, and production efficiency. Many clients often ask: For high-hardness materials or micro-structured components, which method is best? This article provides an in-depth analysis.