Formulas
Cutting speed (vc)
(m/min)
Spindle speed (n)
(rpm)
Metal removal rate (Q)
(cm³/min)
Table feed or feed speed (vf)
(mm/min)
Torque (Mc)
(Nm)
Net power requirement (Pc) (kW)
Average chip thickness (hm). For straight cutting edge.
Side milling
(mm)
Note: arccos in degrees
Face milling
If the workpiece is placed central to the milling cutter.
(mm)
Note: arcsin in degrees
Specific cutting force (kc)
(N/mm²)
If γ
0 is unknown, use γ
0 = 0°, which becomes:
Formulas for specific milling cutters
Cutters having a straight cutting edge
Max. cutting diameter at a specific depth mm.
Face milling (centered workpiece)
straight edge and
side milling (ae >Dcap/2) mm.
Side milling (ae <Dcap/2)
straight edge mm.
Cutters with round inserts
Max. cutting diameter at a specific depth mm.
Face milling round insert
(ae >Dcap/2) mm.
Slide milling (ae<Dcap/2) and round insert (ap<iC/2) mm.
Max. cutting diameter at a
specific depth mm.
Feed per tooth (mm/tooth),
cutter centered.
Feed per tooth (mm/tooth), side milling.
Internal circular ramping (3-axes) or circular milling (2-axes)
Peripheral feed
(mm/min)
Tool centre feed
(mm/min)
In a solid workpiece where
Dw = 0 and
ae eff =
Dm/2
Feed per tooth
(mm)
Feed per tooth
(mm)
External circular ramping (3-axes) or circular milling (2-axes)
Peripheral feed
(mm/min)
Tool centre feed
(mm/min)