Turning Horsepower Calculator
SI
Imp
Imperial
Inputs
View results
Work diameter
(D)
Workpiece diameter at the cutting edge.
mm
Cutting speed
(Vc)
Surface cutting speed at the work diameter.
m/min
Feed per revolution
(fn)
Turning feed per spindle revolution.
mm
Depth of cut
(ap)
Radial depth of cut.
mm
Specific cutting force
(kc)
Material/tool cutting-force coefficient. Use toolmaker data when available.
MPa
Machine efficiency
(eta)
Allowance from cutting power to required spindle power.
%
Results
Default result
Edit inputs
Required spindle power
(P_sp)
2.25
kW
Cutting power divided by the entered machine efficiency.
Also computed
Cutting power
(P_c)
1.8
kW
Material removal rate
(Q)
72
cm³/min
Spindle torque
(T)
18.75
N·m
Spindle speed
(n)
1,146
rpm
Cutting force estimate
(Fc)
600
N
Uncut chip area
(A_c)
0.4
mm²
Efficiency used
(eta)
0.8
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Method notes
3 notes
RPM = Vc * 1000 / (pi * D), with Vc in m/min and D in mm.
Turning MRR = cutting speed * feed per rev * depth of cut.
Specific cutting force changes with material, insert geometry, chip thickness, lead angle, wear and coolant. Treat this as a spindle-load screen, then verify against the machine load meter and tooling data.
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