2m+ travel lengths with a ballscrew, using linear rail to support the ballnut

[JAZZCNC]

Resolution is not so relevant as I'll use servos, not sure how powerful but was told 400w should be ok I think £2k will buy the servos and the mesa controller so I can use linuxcnc.

I really want to direct drive with oldham coupling but it can be belt driven I suppose, the most important things are large travel, good accuracy and good speed.

You're in Cuckoo land if think direct drive 400w servos are going to spin 2.5mtr long 25mm or 32mm ball screws at high speeds.

On the rail idea why spend £250 plus on rail system which will be a pain to implement when there are much easier ways to avoid or deal with the whip.
The best way to deal with the whip is not to have it in the first place. So choose the method and size the components correctly and you won't have the whip.

Would be better spending £250 on building rotating nut system and take whip out the equation.!

[Desertboy]

You're in Cuckoo land if think direct drive 400w servos are going to spin 2.5mtr long 25mm or 32mm ball screws at high speeds.

On the rail idea why spend £250 plus on rail system which will be a pain to implement when there are much easier ways to avoid or deal with the whip.
The best way to deal with the whip is not to have it in the first place. So choose the method and size the components correctly and you won't have the whip.

Would be better spending £250 on building rotating nut system and take whip out the equation.!

What size do I need? 1.2kw?

Rotating nut is considered as well ;) It's just I only vaguely understand how to make it work.

[JAZZCNC]

What size do I need? 1.2kw?

Impossible to answer without knowing more about the machine and Masses you are trying to move plus what speeds your looking for.

[Jonathan]

Would be better spending £250 on building rotating nut system and take whip out the equation.!

On that note, I do have 6 partially made rotating nut assemblies left over. I never seem to get round to finishing them, so if DesertBoy is keen then it's a cheapish way forward. I've made the motor mounts and partially made the bearing mounts (bored both bearings and center). Shafts need making. I've got the pulleys in stock. I notice we're both in Leicester...