Rotating Ballnut - design ideas

[Ale]

Hello!
I would like to get some input.
I have finished my build with rotating ball nut. Screws are 3m (y axis) and 1.7m (x axis) long, 32mm pitch, 32mm dia.
However, I do get some wobble when nut is rotating, I don't know is this something I should worry about. I did everything as flush and concentric as I could. Screws are tightened on ends, not too much tho.
Below are videos. Wobble is about 1-2mm.

[JAZZCNC]

Hello!
I would like to get some input.
I have finished my build with rotating ball nut. Screws are 3m (y axis) and 1.7m (x axis) long, 32mm pitch, 32mm dia.
However, I do get some wobble when nut is rotating, I don't know is this something I should worry about. I did everything as flush and concentric as I could. Screws are tightened on ends, not too much tho.
Below are videos. Wobble is about 1-2mm.

It's just a matter of fine adjustment of the alignment of the screw and the ball-nut and the rotating nut assembly.

Unless you machined the rotating nut shaft so it locates with the ball-nut body then it's very easy for the concentricity to be out a little bit so you will need to align them carefully. You are very close so a little adjustment here and there is all it will take to get it right.

[AndyGuid]

Hi Martin, welcome to the forum!

Afraid I don't have the knowledge to answer your question with certainty, but my gutfeel is that 2010 would be sufficient with the ballscrew being stationery as you plan on using a rotary nut.

Hopefully a knowledgeable member will notice your post and give you an authoritative answer over the weekend.

Jonathan's Rotating Ballnut is the only thread I've seen on this subject, so they seem to seldom be used on DIY builds.

[m_c]

2010 would likely be good enough, or even 1610.
To work that out, you really need to calculate the maximum forces involved.

The reason rotating ballnuts aren't popular, is spinning the screw is far easier.
Rotating ballnuts are far more elaborate, and for most applications aren't needed.

[Dekata]

Do anyone have a working download link of the rotating nut cad design, or can post it/send it to me?