How to Calculate Speeds and Feeds for Different Materials on CNC
Key Takeaways & Technical Summary
- Core Focus: Learn how to calculate correct speeds and feeds for CNC machining different materials to improve tool life, surface finish, and productivity.
- Technical Coverage: Detailed breakdown of Basic Formula, Recommended Surface Speeds (SFM).
- Akriti Benchmark: Engineered in Bengaluru with a vibration-damping Carbon Fiber / Fiberglass Composite Superstructure, 15–25 µm tested repeatability, and Italian Teknomotor spindles — explore Authentic Italian Teknomotor Electrospindles.
Correct speeds and feeds are essential for achieving good surface finish, longer tool life, and efficient machining. Using wrong parameters can damage tools and reduce productivity.
Basic Formula
RPM = (Surface Speed 3.82) Tool Diameter
Feed Rate (mm/min) = RPM Number of Flutes Chip Load per Tooth
Recommended Surface Speeds (SFM)
- Wood: 300 600 SFM
- Acrylic: 200 400 SFM
- Aluminium: 200 300 SFM
- Brass: 150 250 SFM
- Mild Steel: 80 120 SFM
Final Thoughts
Start with manufacturer-recommended values and adjust based on your machine, tool, and material. Proper speeds and feeds can significantly improve your machining results.
Akriti Precision Systems recommends using correct cutting parameters to achieve better performance and tool life on its CNC machines.