CNC Manufacturing Surface Finishes

As machined surfaces reflect the condition of a part immediately after CNC processing. Edges are cleaned and burrs removed, while machining marks remain visible. This finish is often chosen when dimensional accuracy and cost efficiency are prioritized over surface appearance.

Anodizing alters the surface of aluminum by forming a controlled oxide layer. The resulting finish improves resistance to environmental exposure and surface wear, while also allowing color treatments for parts that require both protection and visual differentiation.

Polishing refines the surface through mechanical smoothing, reducing roughness and surface defects. It is typically selected when a cleaner, brighter appearance or smoother contact surface is required.

Sand blasting modifies the surface using abrasive impact, producing an even, non-reflective texture. This method is frequently used to remove surface residues or to prepare parts for subsequent finishing steps.

Tumbling finishes parts through continuous motion with abrasive media. The process softens sharp edges and produces a uniform surface feel, making it suitable for small components where consistency across multiple faces is important.

Alodine treatment creates a protective chemical layer on aluminum surfaces. It is often applied when corrosion protection is required without significantly altering part dimensions, and when surface readiness for painting is important.

Heat treatment changes the internal structure of metal parts through precise thermal cycles. This process is used to achieve specific mechanical characteristics such as increased strength or improved toughness, depending on the application.

Brushed finishes introduce a consistent directional texture onto the surface. This approach reduces the visibility of random scratches while maintaining a technical, industrial appearance.

Powder coating forms a durable surface layer by curing dry powder onto the part. The finish offers strong resistance to wear and environmental exposure while supporting a wide range of surface textures.

Electroplating adds a metallic surface layer through electrical deposition. This finish is selected to enhance surface durability, corrosion resistance, or functional surface properties.

Black oxidize produces a dark, low-reflectivity surface on ferrous materials. The treatment improves corrosion performance while maintaining tight dimensional control.

PTFE coatings reduce surface friction and improve resistance to chemical exposure. This finish is commonly applied when smooth movement or reduced wear between contacting surfaces is required.

Electroless plating deposits a uniform metal layer through a chemical reaction rather than electrical current. The process is well suited for complex geometries where consistent surface coverage is needed.

Painting applies a protective and decorative layer to part surfaces. It is often used to enhance appearance while providing an additional barrier against environmental factors.

Passivation improves the corrosion resistance of metal surfaces by removing contaminants introduced during machining. The process helps stabilize the surface for long-term use in demanding environments.

Electrophoresis uses electrically charged particles in a liquid medium to form an even coating. This technique is applied when consistent surface coverage is required across intricate shapes.

SPI Finish defines standardized surface textures for plastic parts produced through injection molding. These finishes help maintain consistent appearance and functional surface quality from part to part.