Arduino, and Mechanical Movement of Objects - a Newbie Question

Using Arduino Project Guidance
7
  1. What determines when a hook needs to slide, and what do they do when the determination is made?
  2. Are the hooks expected to move independently of each other?
  3. Are we sliding side to side along the shaft or rotating around the shaft?

  1. Ideally, they would slide very slowly but continually back and forth as the crank is turned. "As the crank is turned" suggests a purely mechanical device might be better suited. I mean, I might need to answer the phone, pour more coffee, take a leak, and forget to turn off that motor. When I move them manually, it's in response to certain visual cues; the yarn is getting deep in a particular slice of the drum, and the "V" shape of the split yarn starts to move towards the place where it's mounding more deeply.

  2. As it is right now, yes, they move independently. Whether they are moved by purely mechanical means, or with the assistance of electronics, they would slide back and forth in unison. I anticipate a nearly perfect distribution of the yarn around the drum, and zero breakage.

  3. They slide side to side.