So I had a bearing starting to make a noise on the Y so rather than leave it, I got onto it and change both bearings.

But something isn't right as the new ones make a horrible grinding/squeeking noise from day one with zero hours use on them. I assumed I had put things back wrong.

Got some new bearings, took things to bits and replaced them again, making sure I didn't damage anything and putting everything back correctly.

But again from day one they are making the same horrible grinding/squeezing noise.

Is there some special method of installing bearings or ball screw support that im not aware of? Im clearly doing something wrong