[Crawler]

Hey guys, i'm working on a little project to use for training members on different ways of doing things, my goal is to use a window motor to drive an 8mm threaded rod, the rod having a nut which will move an object back and forth. Now if i did my calculations right then our 9.1 N*M window motor will be able to deliver 113.75 N of force to overcome friction and get the thing moving (if im wrong then please tell me what to do because im new to this).

Now this is neglecting the force of friction from the threaded rod to the nut, so the question is, how do i calculate the coeficient of static friction between the 2.

Also, if i use multiple points where the object is connected then being that its still the same normal force, that shouldnt factor in right?