CNC Milling for Stainless Steel 304
CNC milling 304 stainless steel requires careful attention to cutting parameters due to its tendency to work-harden. Proper speeds, feeds, and tooling selection are critical for successful machining.
Recommended Machining Parameters
| Parameter | Value |
|---|---|
| Achievable Tolerances | ±0.02 mm (±0.0008") |
| Surface Finish | Ra 0.8-3.2 μm |
| Cutting Speed | 50-100 m/min (SFM 165-330) |
| Feed Rate | 0.05-0.10 mm/tooth |
| Tooling Recommendations | Carbide end mills with TiAlN or AlTiN coating, 4-5 flutes for finishing. Use variable helix to reduce chatter. |
Expert Machining Tips
1
Maintain constant chip load — never let the tool rub
2
Use climb milling exclusively
3
Keep tools sharp; replace at first sign of wear
4
High-pressure through-spindle coolant recommended
5
Reduce speed for interrupted cuts
Common Parts Made
Food processing equipment
Medical instrument housings
Chemical vessel components
Architectural fittings
Valve bodies
Machining Challenges
- Severe work-hardening if tool rubs
- Built-up edge formation
- High heat generation at tool-chip interface
- Stringy chips difficult to manage