Nut-screw drive devepoled from “Nut-screw drive 1a”
Input: yellow screw of lead t1.
Orange nuts has circular grooves (not helical).
The blue slider has revolution joints with the three nuts so the latter can rotate in it. The nuts are arranged symmetrically around the screw axis to increase load capacity of the drive and reduce screw bending.
Output: blue slider moving t1 in 1 rev. of the input.