Copper CNC Machining
Copper's unmatched thermal and electrical conductivity makes it essential for heat sinks, bus bars, RF components, and high-current electrical connectors.
Alloy Grades & Properties
| Grade | Properties | Applications |
|---|---|---|
| C110 (ETP Copper) | 99.9% pure, highest conductivity | Bus bars, heat sinks, electrical connectors |
| C101 (OFHC Copper) | Oxygen-free, superior conductivity & ductility | High-end heat sinks, RF components, vacuum applications |
| C145 (Tellurium Copper) | Free-machining, good conductivity | Electrical connectors, welding tips, nozzles |
Machining Tolerances
Standard ±0.05mm · Flatness critical for thermal interfaces: 0.05mm over 100mm
Surface Finishing Options
- As-machined
- Tin plating (solderability)
- Silver plating (conductivity)
- Nickel underplate + gold (connectors)
- Anti-oxidation coating
Common Applications
- Heat sinks and thermal spreaders
- Electrical bus bars and terminals
- RF and microwave components
- Welding electrodes and tips
- Induction heating components
DFM & Machining Tips
- Copper is gummy — use sharp HSS or carbide tools with high rake angles
- High-pressure coolant essential to evacuate chips
- Wire EDM preferred for fine features in thick copper plate
- Design heat sinks with uniform fin spacing for efficient machining
Frequently Asked Questions
Can you machine large copper heat sinks?
Yes — machined-from-solid heat sinks up to 400 × 400 × 100mm. Skived fin heat sinks sourced through partners for higher fin densities.
C110 vs C101 copper?
C110 (ETP) for most applications — lower cost, excellent conductivity. C101 (OFHC) when maximum conductivity and vacuum compatibility are required.
Do you plate copper for solderability?
Yes — tin, silver, and gold plating available. Immersion tin for solderable bus bar surfaces.
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