Low-backlash ball screw recommendations

[Agathon]

I'm looking for a source for a low-backlash ball screw for the quill of my Fehlmann mill-drill (see my previous thread on this machine).

The machine was previously set up with a very nicely constructed worm and wheel drive to the quill rack and pinion, but backlash in the worm and wheel (not the rack and pinion) has led me to consider using a ball screw instead. The photo shows an old actuator ball screw that I've set up to prove the principle.


While positional accuracy over the 120mm of travel is not important backlash is. A dual nut would make sense and would probably be OK since I can accomodate a maximum thread length of 250mm. I've looked through eBay and am unable to find double-nut screws and am unable to seperate the wheat from the chaff in respect of other screws. Some guidance would be appreciated.

David