# The most unusual gears and gears: the wonders of mechanics!

Oscar van Deventer, an American enthusiastic engineer, has been inventing and prototyping sophisticated mechanical puzzles and systems for nearly 40 years - usually very strange indeed. And for almost 10 years, all this has been uploaded to the OskarPuzzle YouTube channel. A good example of Oscar’s work is this video, which shows “irrational” gears. Those systems that we are used to in everyday life and in technology are characterized by a certain gear ratio - 3: 4 or 1: 100 - but irrational can be any, including fractional and even irrational, such as Pi. The video shows a device with a gear ratio equal to the "golden ratio" - 6.47213617 ... to 10.47213617 ...

The topic of today's video review will be extremely boring: mechanical transmissions and gears, simply put, gears. However, upon closer examination, this topic is not at all boring, but even exciting. Imagine, for example, three gears coupled with each other: such a system will not be able to rotate. However, if we think better and abandon the classic round wheel shape, we will make it all work. Several such witty designs on Channel Numberphile were shown by Henry Segerman, an artist and mathematician who, incidentally, was the hero of one of the publications in the magazine Popular Mechanics.

A whole encyclopedia of gears and other mechanisms was modeled, animated and posted on YouTube by Vietnamese engineer Nguyen Duc Thang. More than 2100 videos demonstrating the work of anything, from highly specialized and complex to simple and universal systems, such as a mechanism that turns intermittent rotation into continuous. Despite the venerable age of animations, they are in great demand: Mr. Tang’s videos were watched almost 14 million times.

Gear Down For What is dedicated to gears and gears. Its authors repeated the famous find of another hero of Popular Mechanics, the artist Arthur Ganson, who combined 12 gears into a mechanism with an incredibly large gear ratio. The first wheel in Ganson’s work was spinning at a stable speed of 200 rpm, while the latter would make a revolution in only 2.3 trillion years - and for reliability, it was simply mounted in concrete. Leading Gear Down For What? assembled a mechanism with a gear ratio of 3616238492881: 1. Even a long rotation with an electric drill does not allow one last wheel to be shifted.