High-Performance Thread Mills
CNC Programming Instructions
Thread Milling Methods
Climb Milling
Properties:
Conventional Milling
Properties:
Tool rotation direction clockwise Tool rotation direction clockwise
Tool moves anti-clockwise Tool moves clockwise
Pitch upwards Pitch downwards
Right-hand thread Right-hand thread
Climb milling is always when the cutting
edge goes out of the material with a chip
thickness h = 0
Conventional milling is always when the
cutting edge goes out of the material with
a chip thickness h = max
A
B
h = max
B
Fk = n • fz • Z [mm/min]
Centre Point Feed Fm
Fm =
Fk • (D-Dw)
D
[mm/min]
Centre Point Feed (Fm)
Counter Feed (Fk)
Dw = Tool diameter [mm]
n = RPM [min-1]
fz = Feed per tooth [mm]
Z = Number of teeth on tool (radial)
D = Nominal diameter of thread = Diameter of external contour [mm]
Dm = Diameter of the centre point (D-Dw) [mm]
widia.com
Y79
Mills
Counter Feed Fk