KM Solid End Mill Torque and Horsepower

For Solid 0º Lead Angle - Positive Rake Helical End Mills with KM Quick-Change Tooling


Conversion of Workpiece Material Rockwell (Optional)
Skip this step if you already know the Brinell hardness number(HB)


Characteristics of Workpiece Materials


End Mill Nomenclature

in. mm.
in. mm.
in. mm.

Machining Conditions

sfm m/min
in.(DOC) mm (DOC)
in.(WOC) mm(WOC)
in. IPT (chip load) mm
What's This?
Machinability factors
Most Common
Workpiece Materials
Cm at W/D ratios:
W/D < = 0.66 0.66 < W/D < 1.0 W/D = 1.0
Aluminum alloys 1.0 1.05 1.1
Carbon and alloy steels 1.0 1.15 1.3
Cast irons 1.01.15 1.3
Titanium alloys 1.0 1.20 1.4
Stainless steel, High-temperature alloys 2.0 2.15 2.3
What's This?
Tool Wear Factors, Cw
Milling Depth of cut Feed per tooth Cw
Category (min-max), in. (min-max), in. &nbsp;
Light 0.020-0.100 0.003-0.006 1.1
Medium 0.100-0.200 0.006-0.010 1.2
Heavy duty 0.200-0.400 0.010-0.020 1.3
What's This?
Machine Tool Efficiency Factors
Direct Belt Drive .9
Back Gear Drive .75
Geared Head Drive .7-.8
Oil - Hydraulic Drive .6-.9

Safe Operating Conditions

lb N
lb N
ft lb Nm
ft lb Nm

Calculated Machining Conditions

(IPM)(no productivity formula) mm/min (no productivity formula)
in (chip load at the cut) mm/min
(IPM)(with productivity formula) mm/min
in.3/min MRR cm3/min3
in.2 mm2

Calculated Required Power

lbf should not exceed Ft max N should not exceed Ft max
ft-lb should not exceed Tp Nm should not exceed Tp

Machining power

HPc kW
hp kW

These calculations are based upon theoretical values and are only intended for planning purposes. Actual results will vary. No responsibility from Kennametal is assumed.