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

[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.