Help me in design gearbox problem for milling machine

[hellovn]

hello alll
I am designing a gearbox for milling machine. For Finite element Method purpose, what are the input data (such as cutting force, spindle speed or load torsion moment) most influencing to structure of the gearbox? I am using FEM software for calculating the structure of this gearbox

 

[Danger]

Welcome to PF, Hellovn.
Please don't double-post. Your other posting of this in Systems and Design has already attracted a response.