Rotating ball nut assembly for fast linear cnc motion

[Bongodrummer]

Hi all,
So I've been holding off posting the rotating ball nut setup we've been making utill I got it working well... Time will still be the test, but ATM I'm quite chuffed with it
Basically, its a way to access the precision and speed of a LONG ballscrew, without the need to spin, accelerate and decelerate the big massive screw that has comparatively huge inertia.

Here's an explanation and how the system goes together.