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I found a couple good technic triangle designs over on brickengineer.com. For example:

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How can I firmly attach a triangle to a large turntable?

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Details:

  • Really I only need to attach parts at the points of an equilateral triangle. These triangles are for example only; Solutions don't necessarily need to use these specific triangle designs.
  • The setup should be able to rotate while bearing a small amount of weight (hence the turntable).
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Have to say I'm not a big fan of the triangles you've already posted. In my opinion the half beams on the corners are too close together, causing stress on the elements. Triangular technic designs are certainly possible, the following elements are useful:

https://www.bricklink.com/v2/catalog/catalogitem.page?P=10288

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https://www.bricklink.com/v2/catalog/catalogitem.page?P=57585

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  • This doesn't really answer the question of how to attach triangles (either the ones posted or others) to the turntable :(.
    – Zhaph - Ben Duguid ♦
    Commented Sep 3, 2018 at 13:58
  • I think if you know about this pieces it's straightforward to both create a triangle and attach it. I was reasoning that it would be better if the OP came up with his own design rather than having everything spelled out for him.
    – Michael Verschaeve
    Commented Sep 4, 2018 at 12:17

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