New interesting answer to screw whip.

[alboy]

Thanks for that explanation, glad I have learned something new today, I assume (again) that the higher resolution of ballscrew would not be so important to a large woodworking cnc router as compared to the accuracy required of a cnc mill. I would hate to think what 2x 3mtr ballscrews would cost, I take it a support system to prevent screw whip would add to that cost as well I know that double pinion anti backlash and larger steppers would add to the cost of R&P (that's what I have on my machine) but do not have a clue as to what the price difference would be. I know my machine is accurate enough for the type of work I do even fairly detailed relief carving but I suspect the precision would be insufficient if I were to attempt cutting or milling to tight engineering tolerances. Thanks again oh wise one for your enlightenment. :-) :-) My inquisitive mind a satiated lol.

[JAZZCNC]

I would hate to think what 2x 3mtr ballscrews would cost, I take it a support system to prevent screw whip would add to that cost as well

Not much as you probably think if got from China. If done correctly no support system is required and no whip will occur.
If wanting really high rapid feed rates then does start falling in R&P favor because does get difficult to handle whip with ball screws without going to rotating nuts.
But if can live with 15-20mtr/min rapids then ball screws can be made to do this without the whip and no pratting with rotating nuts etc.