Gear reducing kit recommendation

[Ale]

Those screws where 2525 with 2:1 ratio using 8Nm 3phase closed loop motors and mains drives. They also had fixed ends at both ends of the screws and where preloaded slightly to tension the screws.

Very elegant setup. Just now I noticed that it is rotating nut driven as you mentioned.

I don't think Jonathan does much with DIY CNC anymore as he's working now he's left university. I bought the last 6 sets he made.

Rotating ballnuts are not so common and might require you have your own made. This is the only other place I have seen rotating ballnuts. Use google translate.

https://team-haase-shop.de/maschinenelemente.html

I have found those before, but max nut size is 20mm, while I should look for 32mm as you suggested. So I will try make it locally. I guess 20mm is too low.

No probably about it, I'm 100% sure because I've worked on them, only last week I converted a router which used them and it was sloppy as hell. Just about every Chinese router I've worked on uses them.

I think you are 100% right then. Thank you for saving me money.

I would avoid these, I have worked on a machine that used those anti-backlash untis and was not impressed at all. They where difficult to setup and where constantly needing adjustment. They also caused premature wear on the rack/pinion. The Rack was low quality and wore out within 1 year and as been replaced with helical rack I believe.

Thank you for saving me money, again.

3 phase Closed loop steppers with 220Vac mains powered drives are a great choice for a large hassle free machine.

Could you let me know where can I get motors you used?
And thank you again for helping.