The starting position of gear hobbing tool installation is shown in the figure.
End position of tool channeling: LPO / 2 + 2 · Mn.
Starting point of gear hobbing tool installation: Le + Mn.
Initial starting point position of gear hobbing tool: the distance between the center line of the gear and the effective long starting point of the hob (Le + Mn).
End point of gear hob: effective gear pitch of LP / O + 2.