CNC Milling for Copper C110 (ETP Copper)
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.
Recommended Machining Parameters
| Parameter | Value |
|---|---|
| Achievable Tolerances | ±0.02 mm (±0.0008") |
| 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). |
Expert Machining Tips
1
Use very sharp tools with positive rake
2
High feed rates help with chip breaking
3
Consider chip-breaking geometry end mills
4
Avoid rubbing — maintain constant chip load
5
Use compressed air or mist coolant
Common Parts Made
Bus bars
Heat exchanger plates
Electrode components
RF cavities
Cooling channel blocks
Machining Challenges
- Long stringy chips wrap around tools
- Material adhesion to cutting edges
- Burr formation on exits
- Soft material deforms easily