Quote Originally Posted by WoodKnot View Post
Good evening Jazz

OK, so my ballscrews will not fit inside anyway, unless I use a different style of nut?

The ballscrews are too short for the profiles, so overall a complete mess.

Is there an alternative nut and if I got screws that are longer than the profiles, could the bearings be seated in the plates?

Your thoughts please?
The choices are limited with what you have now because as I say these parts were never designed to fit together as you planned. There is no nut you can use that will fit into the space you have in that C beam profile and the location of the rails/bearings in the position you intended. (see end shot)
Even moving the rails onto the top and side orientation doesn't help much because of the type of profile.

In my opinion, your only choice is to go with something like I have shown and live with any compromises or start again with a different profile and design.!

Click image for larger version. 

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Let me know what your thinking and I will continue with the other axis, because like I say it's not just the Y-axis which will give problems.