Hi i've been reading up a lot , and i've seen people say you need to pree-load the ballscrew and nut,, now me just been new to cnc and i'm planing to convert my viceroy tds11gb lathe to cnc, i do not no how to do this?

someone on an other forum said to get the c5 gear as its 0 back lash but on here and other places people say you have to pree-load the c7 to get 0 back lash?

could anyone tell me how to do this and if you have any photos could you put them up?
cheers