CNC Milling for Titanium Grade 5 (Ti-6Al-4V)
Milling Ti-6Al-4V is one of the most challenging CNC operations due to titanium's low thermal conductivity, high strength, and chemical reactivity with cutting tools. Specialized techniques are essential.
Recommended Machining Parameters
| Parameter | Value |
|---|---|
| Achievable Tolerances | ±0.02 mm (±0.0008") |
| Surface Finish | Ra 0.8-3.2 μm |
| Cutting Speed | 30-60 m/min (SFM 100-200) |
| Feed Rate | 0.08-0.15 mm/tooth |
| Tooling Recommendations | Carbide with AlTiN or TiB2 coating. 4-5 flute variable helix. Consider ceramic end mills for roughing. |
Expert Machining Tips
1
Use very low cutting speeds to manage heat
2
High feed per tooth to maintain chip thickness
3
High-pressure through-spindle coolant is mandatory
4
Climb milling only — conventional milling causes severe rubbing
5
Use trochoidal milling for slots and pockets
Common Parts Made
Turbine blade blanks
Aerospace structural fittings
Medical implant components
Compressor housings
Motorsport brackets
Machining Challenges
- Rapid tool wear from chemical affinity
- Heat concentrates at cutting edge
- Titanium catches fire if chips ignite
- Requires rigid machine and fixturing