Rob. I still don.t get why you seem so happy about the Kress router. I assume yoga might be your secret. :))

Hi Neale.
Truth be told, for the y axis I kind of hoped for the best in the setup. I tried some techniques I found online to align the rails, and the ballscrew, but it seemed to not work so well as advertised, so in the end, I just did a feel run, like aligned one end of a rail, than bolted that, that the other one, and used some shims to adjust any issue, and when it felt like it was running smooth, I mounted the ballscrew, in the same manner. One end first in one plane, them attached a pice of rod to the coupler, and turn it with the tips of my fingers, and bit by bit, fixed all nuts until I could turn the ballscrew with the tips of my fingers for the whole 1420mm run.

With other word, beyond the language barrier: I have no clue what I did from a technical perspective. It just felt good enough. So could you please guide me towards a reliable way or alligning the y axis rails and ballscrew. :)