Rotating ball nut, Ballscrew Pitch, RPM limits, and my particular build pickle

[Bongo]

Thanks for this Jazzcnc, good advice.

The 'quick method' posted above in the youtube vid, didn't really work for me because getting a 2.5m long ballscrew vertical and then being at the top, in a convenient place see clearly into the nuts and spoon the bbs in seemed troublesome...

So yeah, after cleaning everything up with lots of brake cleaner (it was reasonably grubby in there), I used the grease dabs to 'stick' the bbs in place. I'm surprised at how well that worked! :D Did it over a
cardboard box lined with paper towel. Miraculously, number of bbs lost = 0.





Upon reassembly, I realized how poor the 'wiper seals' are. Just pieces of hard white plastic that don't seem to fit very well, and that get slightly deformed by the two grub screws holding them in place. They leave a thick layer of grease from inside the nut, very much ALL over the screw outside the nut, where it will attract dust & debris. Has anyone made their own seals for these ??

Anyway, it's now MUCH less gritty and rolls well. Still has noticeable lateral play mind you... As you say Jazz I think I should cut my losses.
I messaged Fred on Aliexpress. I was considering a double-nut to remove backlash, but looks like he can't do that on 3232 only 3210. Any experience or opinions on using a double nut for such a large x axis? When I asked about c5 screws Fred mentioned 'TBI' ground and TBI C5 Rolled' ballscrws. I'll admit, I have no idea what "TBI" means - anyone?

Ok thanks again guys.

[Voicecoil]

When I asked about c5 screws Fred mentioned 'TBI' ground and TBI C5 Rolled' ballscrws. I'll admit, I have no idea what "TBI" means - anyone?

Ok thanks again guys.

TBI are a Taiwanese manufacturer (Gten are another), from what I've heard they have quite a good reputation, go here:

https://www.tbimotion.com.tw/en/category/index.html

Fred quoted me on some and they seemed to be about 60% more expensive than his normal ones, but it might vary with the type of nut you have.

[JAZZCNC]

I messaged Fred on Aliexpress. I was considering a double-nut to remove backlash, but looks like he can't do that on 3232 only 3210. Any experience or opinions on using a double nut for such a large x axis? When I asked about c5 screws Fred mentioned 'TBI' ground and TBI C5 Rolled' ballscrws. I'll admit, I have no idea what "TBI" means - anyone?

Ok thanks again guys.

Pointless going with double nuts for a router, esp one this size, the material, and the error or flex you'll have in the machine will far outweigh any error you'll see from the nut.
Also, depending on the rotating ball nut design the longer length of the nut could cause issues. Remember you will now be spinning the nut and at high speed, so a longer nut with the flange on the end of the nut will resonate more, the shorter the better really.

This is another reason for using 32m pitch because it's designed for high speed and uses a nut design that suits high speed better by placing the flange in the middle of the nut and recirculating the balls on both sides of the head flange. For a rotating nut, this is very important as it's much better balanced.

TBI is a reasonable quality ball-screw manufacturer and if you can afford the extra they are worth investing in. Ground screws are light years better than rolled but they also come with prices that can be out of this world on the higher grades.