Quote Originally Posted by hanermo2 View Post
There are endless good mechanical options.

But if 650£ overall is too much, forget it.
I know you said it for transmission only.

You will spend about 2000 for a decent motion system, and about 2400 for an excellent motion system, for a full-sheet setup.
For 2k you can get excellent ac brushless servos, and should do so, and forget anything else, for a business venture.
Rotating 2.5 m ballscrews with modern 220v ac brushless servos is trivial.
They will provide theoretical accuracy around 2 microns, 0.002 mm, and speeds higher than you want to use.

I use about 1/3 of the max speeds available on my large vmc for cutting metal.
Table is 200-250kg, bridge is 500-700 kg, a 400W servo is ok (marginal) but a 6 Nm servo (750W) runs it all day long.

Woodworking loads are under 100 kgf.
Hello!
Thank you for reply.

Well, I was thinking of screws, but still trying to find long and at least 25 25 ones. Do you have source for them? What is your experience with screws that long? Do they sag under their weight? Which ones do you use and what speeds do you get?
If you don not have precision screws, it does not matter how accurate servos are, right?
About servos, are you talking about those cheap Chinese ones from Ebay? I was thinking about them also, but figured that Nema34 with low inductace would be enough since I would need to gear down servos alot.

I am ready to spend about 10k Euros on this project, but would like to get good stuff worth the money. Well, best I can get at least.