CNC-machined impellers offer several key advantages. They are energy-efficient due to their smoother, polished finish, which enhances the flow of matter and reduces energy consumption. These impellers are also more robust, as they are machined from a solid piece of metal, providing greater strength and durability. Additionally, CNC machining ensures high precision and performance, allowing for the creation of complex geometries that are difficult to achieve with other methods. This makes them ideal for customization and prototyping, offering versatility across various industries.

Common finishing types for impeller blades include precision machining (CNC milling or grinding) for smooth surfaces and tight tolerances, electropolishing to reduce surface roughness and improve corrosion resistance, and abrasive flow machining (AFM) for internal surface refinement. Shot peening enhances fatigue resistance by inducing compressive stress, while surface coatings such as thermal sprays or PVD improve wear and corrosion resistance. For intricate designs, hand polishing is often used to ensure a high-quality finish in difficult-to-reach areas.