Hello thanks for the reply, and sorry for the delay 

With the handed calculation, just take in consideration the first calculation ΔL1 ( the 2 others are for other part of my assemby and i've disabled the in Workbench)


Material used is stainless steel

PS : Sorry, some BC are in French

The BC (support fixe= fixed support).

I have disabled the remote displacement (deplacement distant) because my model is an assembly of different pieces and the main goal of my study is to find the slack between them. In this case I just wanna the displacement of the roll and  when I compare just the displacement of this one with the handed calculation, I find different results.

Thx for the help