How To Make a Homemade Euler’s Disc
This is my homemade Euler’s disc made from 4 metal discs I got from a broken hard drive. If spun on a smooth surface, the disc will spin between 45 seconds-1 minute. I used four discs for mine but I should have used about eight to make it correctly proportional. You can also use Cd’s or DVDs as well. Once again, the ratio of the diameter of the discs to the depth of them glued together must be 6:1 to reach optimal spinning time.