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Hubless Rotation Structure

Discussion in 'Other Builds' started by BillyBob, Apr 19, 2019.

  1. BillyBob

    BillyBob Well-Known
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    I have a sheet of aluminum 10" x 48" that I rolled into a semicircle (180 deg). I need to be able to rotate this smoothly around its imaginary center point which is a radius of about 15" in a "hub-less" fashion. So I think I will need to build some kind of structure with a 30" diameter to use as a "track" for my sheet to use as a guide. Only about 1" on the outside edges of the rolled aluminum can be used for supports/guides and the remaining area must be left open. Hope that makes sense.

    So I have either side of the this piece's edges of 48" to add some kind of guide/track that will be used to move this piece around the center point and to keep it true in its angular motion. Hopefully the attached rendering may help illustrate what I am trying to do.

    Any suggestions on how I can mechanically arrange this?

    Thank you for your help.

    Bob
     

    Attached Files:

  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
    Staff Member Moderator Resident Builder Builder

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    Would pocketed V-wheels do the trick? Make the base ring with a 1" cross section and cut some vertical pockets spaced around the ring with the V-wheels set down in them. Maybe even add a recess down the middle of cross section so the bottom edge of the aluminum would sit down slightly inside and the wheels would be fully recessed so they're not visible...
     
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  3. BillyBob

    BillyBob Well-Known
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    Hmmm, well that is the kind of thing I was looking into, and why I posted here... I am just trying to visualize exactly what you are suggesting. However, yes the v-wheel arrangement would provide for the kind of movement I am wanting.
     
  4. Rick 2.0

    Rick 2.0 OpenBuilds Team
    Staff Member Moderator Resident Builder Builder

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    This is basically what I was suggesting:
    Ring 3.jpg
    Ring 2.jpg Ring 1.jpg
    Sketchup file attached
     

    Attached Files:

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  5. BillyBob

    BillyBob Well-Known
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    Ah, yes! Very interesting... Thank you. Let me contemplate how to go about the construction of such... This has got me excited, awesome!
     
  6. BillyBob

    BillyBob Well-Known
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    Rick, this here, your suggestions/help is one of the several reasons why when I need to purchase items for my projects that the OpenBuilds Parts offer, I support them... Thank you very much for helping me through my mental block.
     
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