Drilling Horsepower Calculator
SI
Imp
Imperial
Inputs
View results
Drill diameter
(D)
Cutting diameter of the drill.
mm
Spindle speed
(n)
Drill rotational speed.
rpm
Feed per revolution
(fn)
Axial advance for each spindle revolution.
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
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Required spindle power
(P_sp)
0.2356
kW
Cutting power divided by the entered machine efficiency.
Also computed
Cutting power
(P_c)
0.1885
kW
Spindle torque
(T)
1.875
N·m
Material removal rate
(Q)
7.54
cm³/min
Drilling feed rate
(Vf)
96
mm/min
Cutting speed
(Vc)
37.7
m/min
Efficiency used
(eta)
0.8
Method notes
3 notes
Drilling feed rate = feed per revolution * RPM.
Drilling MRR = pi * D^2 / 4 * feed rate.
Specific cutting force changes with material, drill geometry, web thickness, coating, wear, coolant and hole depth. Treat this as a spindle-load screen, then verify against tooling data and the machine load meter.
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