December 7, 2023

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Kinetic Cyclic Scissors | Hackaday

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Kinetic Cyclic Scissors | Hackaday

[Henry Segerman] and [Kyle VanDeventer] merge math and mechanics to develop a kinetic cyclic scissors sculpture out of 3D printed bars adjoined with each other 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 considered of as a part of an infinite tiling of self related quadrilaterals in the plane. The tiling of the aircraft by these self related quadrilaterals can be recognized as a framework by becoming a member of the diagonal points of just about every quadrilateral with bars. The fundamental query [Henry] and [Kyle] desired to solution was underneath what ailments can the realized bar framework of a subsection of the tiling be designed to transfer. Shockingly, when the quadrilateral is a parallelogram, like in a forklift, or “cyclic”, when the endpoints lie on a circle, the bar framework can move. Tweaking the ratios of the center lengths in a cyclic configuration sales opportunities to diverse forms of rotational symmetry that can be attained as the composition folds in on itself.

[Henry] and [Kyle] go into more detail in their Bridges Convention paper, with derivations and even further conversations about the symmetry induced by modifying the constraints. The specifics are gentle on the actual kinetic sculpture showcased in the movie but the bar framework was picked to have a mirror style of symmetry with a motor attached to one particular of the central, decrease bars to drive the motion of the sculpture.

The bar framework is out there for download for any individual seeking to 3D print or laser minimize their possess. Bar frameworks are beneficial strategies and we have witnessed them employed in art sculptures to strandbeests, so it’s great to see further more explorations in this area.

Movie just after the crack! at?v=76XIrm91Ra0