Milling Horsepower Calculator
SI
Imp
Imperial
Inputs
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Width of cut
(ae)
Radial width of cut engaged in the material.
mm
Depth of cut
(ap)
Axial depth of cut.
mm
Feed rate
(Vf)
Programmed table feed rate.
mm/min
Specific cutting force
(kc)
Material/tool cutting-force coefficient. Typical values vary strongly by material, tool geometry and chip thickness.
MPa
Machine efficiency
(eta)
Allowance from cutting power to required spindle power.
%
Spindle speed
(n)
Spindle RPM used for torque and chip-load checks.
rpm
Flutes
(Z)
Effective number of cutting edges.
flutes
Results
Default result
Edit inputs
Required spindle power
(P_sp)
0.375
kW
Cutting power divided by the entered machine efficiency.
Also computed
Cutting power
(P_c)
0.3
kW
Material removal rate
(Q)
12
cm³/min
Spindle torque
(T)
0.5969
N·m
Chip load
(fz)
0.025
mm
Feed per revolution
(fn)
0.1
mm
Efficiency used
(eta)
0.8
Method notes
3 notes
MRR = width of cut * depth of cut * feed rate.
Cutting power uses P = kc * MRR / 60,000,000 with kc in N/mm^2 and MRR in mm^3/min.
Specific cutting force changes with material, tool geometry, chip thickness, coating, wear and coolant. Treat this as a spindle-load screen, then verify against machine load and toolmaker data.
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