Rectangular rotation using stepper motor

I am trying to build a carousel style (belt driven?) system using stepper motor as shown in the pick. I want to be able to hold items rigidly and hanging vertically (like a rectangular shape that has a hole in it and in that hole there is a test tube). I have seen many videos but I don't understand how things are rotating. Is it the friction between belt and object or its something else.
For example this video ITALPLANT PBC 100 Carousel Type - RNA Automation Ltd - YouTube
SmartSelect_20211231-152224_One UI Home

The video shows the metal carriers attached to a belt of unknown type, attached at their vertical mid point. The carriers top and bottom are gliding in a plastic guide that keeps them vertical.
Are you attempting to duplicate this device?
Paul

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.