3 ms·

I don't think you need all that. They use stepper motors so they do indeed turn exactly 90 degrees. What they would have to worry about is the suction cup not s

I don't think you need all that. They use stepper motors so they do indeed turn exactly 90 degrees. What they would have to worry about is the suction cup not sticking perfectly. E.g. after a 90 degree turn if the momentum makes that part of the cube slide a little when they try to stop, it will introduce a small error. Maybe turning other parts of the cube would correct it.

JoshTriplett 11y ago
I've seen other Rubik's cube solvers that handle this by heavily lubricating the cube, so that if the machine attempts to turn it without perfect alignment, it'll just slip into alignment rather than snapping. See https://www.youtube.com/watch?v=X0pFZG7j5cE https://www.youtube.com/watch?v=X0pFZG7j5cE for an example solver.
- gohrt 11y ago
  Human solvers do the same.
  - Someone 11y ago
    Human solvers do not hold all six sides of their cube in a tight grip. I guess it all depends on how much force it takes to turn such a stepper motor when it isn't powered.