I have a square plate (8x8 cm) that I want to turn it 90 degrees clockwise and after 90 degrees counterclockwise as you can see in the picture. Each rotate will happened after a second delay and fast (don't know exactly the speed but fast).

I know how to control gears etc but I want your help about the simplest implementation. I thought about solenoid or stepper motor or motor with a gear like that https://www.youtube.com/watch?v=fmA9Vnu33FY enter image description here

What do you suggest?

  • $\begingroup$ Check out drill driven valve lapping tools. $\endgroup$
    – Solar Mike
    Commented Dec 6, 2021 at 19:16
  • $\begingroup$ A geneva wheel driven by an electric motor that hits limit switches wired to an H-bridge to revers direction. $\endgroup$
    – DKNguyen
    Commented Dec 6, 2021 at 19:40

1 Answer 1


Any crank system attached to a flywheel will do.

Remember the old steam locomotives? Revers of that.

The wheel turns the handle back and forth. The handle can be connected to your square at a point 135 degrees from a hinge and will go back and forth 90 degrees. the reciprocal play then is 90 degrees


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.