CNC milling copper is challenging due to its softness and tendency to produce long, stringy chips. Sharp tooling and appropriate chip-breaking strategies are essential for successful results.
| Parameter | Value |
|---|---|
| Achievable Tolerances | ±0.01 mm (±0.0004") |
| Surface Finish | Ra 0.4-1.6 μm |
| Cutting Speed | 100-300 m/min (SFM 330-1000) |
| Feed Rate | 0.05-0.15 mm/tooth |
| Tooling Recommendations | Carbide with sharp edges, 2-3 flutes. PCD tools for best finish. Avoid TiAlN coatings (copper affinity). |
Use very sharp tools with positive rake
High feed rates help with chip breaking
Consider chip-breaking geometry end mills
Avoid rubbing — maintain constant chip load
Use compressed air or mist coolant
Bus bars
Heat exchanger plates
Electrode components
RF cavities
Cooling channel blocks
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