Magnetic sphere instead of steel bearing?

New Home Forum ZenXY Hardware Development – ZenXY Magnetic sphere instead of steel bearing?

This topic contains 5 replies, has 5 voices, and was last updated by  Dui, ni shuo de dui 1 week, 1 day ago.

Viewing 6 posts - 1 through 6 (of 6 total)
  • Author
    Posts
  • #83440

    Dakota Jim
    Participant

    Has anyone tried a magnetic sphere instead of the steel bearing on the table top with a thicker table material or with leds sandwiched between 2 layers (glass and whatever) to create a bottom lit sand table. Would the 2 magnets create too much attraction and move jerky?

    #83441

    Ryan
    Keymaster

    I did, the magnet tries to drag instead of the bearing rolling.

    1 user thanked author for this post.
    #83461

    G. Burkhardt
    Participant

    Ball or not, a magnet sphere has a north and south pole somewhere (or maybe several if weirdly polarized). That means it has a strong need to orientate in a direction and as Ryan noticed, that would prevent rolling. I suspect the ball has to be a rather soft magnetic material and I was even wondering to anneal the bearing ball on my table to improve that. But I found the hardened steel ball is good enough.

    It just has to be big enough. with about 5mm distance and a 1/2″x1/2″dia magnet, I can use 1/2″ and 3/8″ bearing balls. But 1/4″ balls sometimes get left behind. Maybe putting a conical steel pole shoe on top of the magnet might help concentrating the magnet field for smaller balls but I have not tried that as well.

    #83472

    Ryan
    Keymaster

    The original Zen build thread I tried a whole variety of magnets and ball sizes. I have ~8 sizes and a whole box of magnets styles and shapes. It was the hardest part of the build. What is recommended works much better than the rest. ball and magnet diameter need to be paired, a large ball won’t stick well, too small and it wanders in the magnetic field. One magnet vs stacked magnets, pole orientation, etc.

    1 user thanked author for this post.
    #83483

    Bill
    Participant

    I use one of the magnets suggested stacked on a thin magnet. That gives me a little more oomph without the issues where a stack can lose the top one or two.

    #83748

    Dui, ni shuo de dui
    Participant

    I use one of the magnets suggested stacked on a thin magnet. That gives me a little more oomph without the issues where a stack can lose the top one or two.

    If the stack doesn’t hold by itself you can glue the magnets to each other.

Viewing 6 posts - 1 through 6 (of 6 total)

You must be logged in to reply to this topic.