Comment by scotty79

AI that drew the diagram couldn't get it's neurons around how planetary screws in linear actuator should work.

Here's an actual schematic: https://ae-pic-a1.aliexpress-media.com/kf/Sd3fe9841e4ed4871b...

Why these screws are used instead of just threads? Because rolling friction is lower than sliding friction. You can use less or more of them trading friction for shock resistance.