Thread Milling Methods

Climb Milling Conventional Milling

Properties: 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 cuttingConventional milling is always when the
edge goes out of the material with a chipcutting edge goes out of the material with
thickness h = 0a chip thickness h = max
AB

h = max

B

Counter Feed Fk Centre Point Feed Fm

Fk • (D-Dw) Fk = n • fz • Z [mm/min] Fm = [mm/min] D

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]