January 28, 2023

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Kinetic Cyclic Scissors | Hackaday

Kinetic Cyclic Scissors | Hackaday

[Henry Segerman] and [Kyle VanDeventer] merge math and mechanics to build a kinetic cyclic scissors sculpture out of 3D printed bars adjoined jointly with M3 bolts and nuts.

a kinetic bar framework with 3d printed bars of alternative black and grey color, each joined with m3 bolts and nuts being held by a person at two points with a quadrilateral tiling overlay

The kinetic sculpture can be thought of as a element of an infinite tiling of self identical quadrilaterals in the aircraft. The tiling of the aircraft by these self related quadrilaterals can be recognized as a framework by signing up for the diagonal points of just about every quadrilateral with bars. The basic issue [Henry] and [Kyle] preferred to reply was underneath what ailments can the recognized bar framework of a subsection of the tiling be produced to move. Shockingly, when the quadrilateral is a parallelogram, like in a forklift, or “cyclic”, when the endpoints lie on a circle, the bar framework can shift. Tweaking the ratios of the middle lengths in a cyclic configuration qualified prospects to various kinds of rotational symmetry that can be realized as the framework folds in on by itself.

[Henry] and [Kyle] go into a lot more detail in their Bridges Convention paper, with derivations and more conversations about the symmetry induced by altering the constraints. The specifics are light-weight on the real kinetic sculpture featured in the online video but the bar framework was picked to have a mirror style of symmetry with a motor attached to a single of the central, reduce bars to generate the movement of the sculpture.

The bar framework is offered for download for any individual seeking to 3D print or laser slice their individual. Bar frameworks are handy thoughts and we’ve viewed them made use of in artwork sculptures to strandbeests, so it’s good to see even more explorations in this room.

Video after the break!

https://www.youtube.com/view?v=76XIrm91Ra0