High-Performance Thread Mills CNC Programming Instructions 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 cutting Conventional milling is always when the edge goes out of the material with a chip cutting edge goes out of the material with thickness h = 0 a chip thickness h = max A B h = max B Counter Feed Fk Centre Point Feed Fm Fk = n • fz • Z [mm/min] 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 High-Performance Thread Mills