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Precision-engineered double pendulum, machined and assembled in the USA.
Most chaotic systems, like weather and fluid dynamics, are vast and complex. The double pendulum is the opposite: two pivots, fully understood, and still impossible to predict. Spin it twice, as identically as you can; within seconds the outcomes diverge.
Most chaotic systems, like the weather, are complex. This one is two pivots — fully understood, still impossible to predict.
No random elements; it can be written as a formula.
It can be written as a formula.
Infinitesimally small changes produce wildly different results; no two runs are ever the same.
Small changes produce wildly different results.
It never settles into a rhythm. The motion never loops.
It never settles into a rhythm.
Chaos doesn’t require complexity. This is the simplest machine that proves it.
Four parts are machined from a single length of 38 × 6 mm aluminium bar. Everything else is catalogue hardware: three shielded stainless bearings, stainless spacers, two shoulder screws.
Machined from one length of aluminium. Design simplified across three generations.
Three design generations removed everything that wasn’t needed — six spacer lengths became one, threaded inserts went, turned axles became standard screws.
Complexity must earn its place.
Anodised 6061-T6511 surface-cut aluminium and bearing bores held to fine tolerances. Shielded stainless bearings; shoulder screws counterbored flush. Every dimension is derived from component tolerances.
Anodised 6061-T6511 surface-cut aluminium and bearing bores held to fine tolerances.
Each unit is machined and assembled in the USA, torqued, and free-spin tested.
Satin black aluminium backdrop, a bronze blade that catches the light — the anodised sheen shifts as the day moves. Still most of the time; alive when it catches someone’s attention. At home beside artwork or a chalkboard, it holds a wall the way a small sculpture does.
Satin black aluminium backdrop, a bronze blade that catches the light. Still most of the time; alive when it catches someone’s attention. At home beside artwork or a chalkboard.
Chaotic Pendulums Co was started in 2002. Outside a university physics hall hung a double pendulum, and one engineering student never managed to walk past it — it was mesmerising. He machined one as a birthday gift for his father, an engineer who had everything and rated most gifts as junk. The gift landed; his father’s friends ordered their own; a small run followed. The pendulums ended up in homes, labs, universities and museums.
Then sourcing got complicated, the student took a job, and production stopped.
Chaotic Pendulums Co was started in 2002 — one student’s hand-machined gift for his engineer father. A small run followed, into homes, labs and museums. Then production stopped.
24 years and three generations later: Mark 3, rebuilt from scratch.
Every unit numbered. No two units will ever move the same way. No two units share a number.