CNC cutting parameters

 

CNC cutting parameters

1. Cutting Speed (Vc)

• Definition: Cutting speed is the linear speed at which the cutting tool's edge moves relative to the workpiece surface. It's typically measured in meters per minute (m/min) or feet per minute (ft/min).
• Importance: The correct cutting speed is vital for achieving optimal tool life, surface finish, and material removal rate.  
  • Too high: Leads to excessive heat generation, rapid tool wear, and poor surface finish.  
  • Too low: Results in lower productivity and can sometimes cause built-up edge (BUE) on the tool.
• Calculation (for turning and milling):
• Metric: $V_c=\frac{\pi \cdot D\cdot N}{1000}$
• Imperial: $V_c=\frac{\pi \cdot D\cdot N}{12}$ where:
• Vc​ = Cutting speed
• D = Diameter of the workpiece (for turning) or the tool (for milling) in mm (metric) or inches (imperial)
• N = Spindle speed in revolutions per minute (RPM)
• π ≈ 3.14159