The best way to model the process consists in the implementation of the existent in the bibliography calculation procedures with their decomposition in correspondence with the metodology for the analysis and synthesis of engineering systems. For more information you could download the book Engineering Systems available in my place Researchgate Site.h
The question is too generic: The first aspect to clear is: modelling for what? to make the mechanical design of the stand or to calculate the driving motor or implemente a control system?
I fully agree with the previous reply, but just to start the work.