Hi Non-Twisty Puzzles fans,
Irrational Gears is a gearing system with a
gear ratio equal to the
golden ratio, that is 1:1.6180339887.... Gear systems are supposed to have a rational gear ratio, that is one can be expressed as a/b, where a and b are both integers. The golden ratio is an irrational number that cannot be expressed this way. The golden ratio is known as the
most irrational number.
This gear system was designed by expressing the golden ratio as 6.47213617... : 10.47213617... . This is close to 6.5:10.5=13:21, a well-known approximation of the golden ratio. The teeth are wrapped around two cylinders, one of which slides over a square bar. At a full rotation of the small gear, the large gear has made 0.6180339887... part of a full rotation. The angle (1-0.6180339887... x 360 = 137.507764068... degrees. is also known as the
golden angle, found in
many places in nature.
Watch the
YouTube video.
Buy the puzzle at
my Shapeways Shop.
Read more at the
Non-Twisty Puzzles Forum.
Check out the photos below.
Enjoy!
Oskar
Last edited: Nov 21, 2015