Hello,
I have built my own CNC router and it was working relatively fine.
Attachment 300460

It had rack and pinion drive with reducer ratio 3:1. I used nema 23 stepper motors 425 oz-in.
Attachment 300462Attachment 300464Attachment 300466

But now I have decided to change to ballscrew type drive, because I need more precision.
I used three RM2005-1500mm ballscrews
Attachment 300468

This is my redesigned router
Attachment 300470

And now I have a problem.
I cant move or jog at the same speed as I could with rack and pinion. Motors suddenly stops if I jog too fast even with low acceleration.
I dont understand why?
Is it just because motors are too weak?
It makes strong vibrations at some points of movement and then motor squeaks and stops.
Any suggestions how to get rid of vibrations?
I know one mistake I made in this build in X axis. I have placed ballscrew too far from linear rails. So I will have to fix that...
Attachment 300472

Will it solve the problem if I buy nema 34 1600 oz-in stepper motor?

Other question is what PSU is needed for nema 34 1600 oz-in motors?
I found this kit on ebay, but I dont nudestand if I realy need 3 PSU for 3 nema 34 motors?
Currently I use 720W 48V15A Power Supply with M542 Stepper Motor Driver 1.0A-4.5A and motors: x3 nema 23 425 oz-in 3.0A and x1 nema 23 263 oz-in 2.8A (z axis)

Thank you for any comments or remarks