Quote Originally Posted by SweetAs View Post
Square rails

Will 20mm rails work? I've only been able to find these at 2.7m so does that mean that 8 x 4 is the biggest I can go? I would be looking at Hiwin.

Drive system

25mm ballscrews, was my first thought but again, I'm still learning. Is there is a good quality supplier to get these from in the UK?
You can join rails - granted its a pain in the arse, but can be done.

I think most machines of this size will use R&P; but theres been some interesting threads recently about rotating ball nut setups which might be worth looking into.

As always with suppliers, Fred at BST Linear on Aliexpress. Email directly for a quote though.