End mills, drills, inserts coatings and feeds & speeds selection
2-flute: Al (chip clearance). 4-flute: steel (finish). Variable helix reduces vibration.
HSS: 30 m/min max. Carbide: 3-5× faster. Gun drill: L/D > 10.
TiN (gold): 400-500 HV. TiAlN: 900-1000°C. DLC: Al anti-BUE. CVD diamond: graphite.
| Material | SFM | Feed (mm/t) |
|---|---|---|
| Al 6061 | 800-1200 | 0.05-0.15 |
| Mild Steel | 300-500 | 0.04-0.12 |
| SS 304 | 200-350 | 0.03-0.08 |
| Ti-6Al-4V | 100-200 | 0.02-0.06 |