Source-gated milling arithmetic
Milling Net Cutting Power
Calculate metal-removal rate and theoretical net cutting power using an effective specific cutting force valid for the actual work material, chip thickness and tool geometry.
Theoretical planning values
The factor 60·106 converts N·mm/min to kW. Equivalently, division by 60,000 gives watts. The units must be stated; writing only “/60000” beside a value labelled kW is wrong by a factor of 1000.
Sandvik Coromant metric milling formulas gives Q=apaevф/1000 in cm³/min and Pц=aeapvфкц/(60·10⁶) in kW. Sandvik’s specific-cutting-force guidance explains that kц changes with chip thickness and tool rake; material-group kц1 is a reference, not a universal effective input.
No capacity guarantee: this theoretical net-power estimate omits transient peaks, acceleration, spindle/drive limits, torque-speed envelope, auxiliary loads, tool wear, runout, interrupted-cut dynamics, stability and controller/OEM derating. Verify the selected operation with tool-maker data and the machine manufacturer.
