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Advanced Surface Speed & Feed Calculator
Calculate Feed (f) for Surface Finish (Ra) and Spindle Speed (RPM) for G96/G50
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architecture
1. Feed Rate Calculation (Based on Surface Finish)
Desired Surface Finish (Ra in µm):
0.4 µm (N4) - Very Fine
0.8 µm (N5) - Fine
1.6 µm (N6) - Medium
3.2 µm (N7) - Rough
6.3 µm (N8) - Very Rough
Custom Ra Value
Custom Ra (µm):
Tool Nose Radius (R in mm):
0.2 mm
0.4 mm
0.8 mm
1.2 mm
info
Formula used: f = √((Ra × 32 × R) / 1000). The smaller the Ra, the finer the finish, which requires a lower feed rate.
speed
2. Cutting Speed (Vc) & RPM Calculation
Job Material Type:
Mild Steel (EN8, C45) - 150 m/min
Alloy Steel (EN19, EN24) - 120 m/min
Stainless Steel (SS304/316) - 100 m/min
Cast Iron (CI) - 120 m/min
Aluminum (Al 6061/7075) - 300 m/min
Brass/Bronze - 200 m/min
Titanium Alloy - 55 m/min
Hardened Steel (>45 HRC) - 90 m/min
Custom Surface Speed (Vc)
Surface Speed Vc (m/min):
Job Turning Diameter (mm):
Minimum Cut Dia (For G50 Limit) (mm):
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3. Calculated Parameters & G-Code
Required Feed Rate (f)
0.20
mm/rev
RPM at Cut Dia
477
RPM
Max RPM (G50)
2387
RPM
Suggested CNC Program Snippet:
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