Cooling Systems and Heat Sinks CNC Machining for Consumer Electronics

Copper provides superior thermal conductivity (385-400 W/m·K) compared to aluminum (150-200 W/m·K), offering approximately 2x better heat transfer. However, copper is significantly heavier and more expensive. For most consumer electronics applications, aluminum 6063-T5 or 6061-T6 provides excellent thermal performance with lower weight and cost. Copper is recommended for high-power density applications or where maximum thermal performance is critical. Hybrid designs combining copper base plates with aluminum fins can optimize performance and cost. Our team can recommend the best material based on your thermal budget, weight constraints, and cost targets.
 

Yes, we specialize in machining complex internal cooling channels for liquid cooling plates and cold plates. Our 5-axis CNC capabilities and specialized long-reach tooling enable production of serpentine channels, jet impingement patterns, and pin fin arrays within sealed enclosures. We can machine channels as small as 0.125″ wide with precise depth control. For leak-proof operation, sealing surfaces are machined with flatness tolerances within 0.002″ and surface finishes suitable for O-ring or gasket sealing.
 

We routinely achieve flatness of 0.001″ to 0.002″ across heat sink base plates up to 6″ x 6″, with surface finishes of Ra 32 microinches or better. For smaller, critical thermal interfaces, we can achieve flatness within 0.0005″ using precision fly-cutting or grinding operations. This level of flatness minimizes thermal interface material thickness requirements and reduces thermal resistance between the heat sink and component. All base plate surfaces undergo flatness verification using precision measurement equipment. 

Optimal fin spacing depends on heat sink orientation and operating conditions. For vertical natural convection, fin spacing typically ranges from 0.125″ to 0.250″ (3-6mm) to balance surface area with airflow resistance. Closer spacing increases surface area but can restrict airflow, while wider spacing improves convection but reduces heat transfer area. Our engineering team can recommend optimal fin geometries based on your thermal requirements, orientation, and available space. We routinely machine fin spacing as tight as 0.080″ with our precision tooling.