For Spirograph, Wild Gears or any other hypotrochoid or epitrochoid drawing set. Find the number of points (or “petals”) in any design, given the number of teeth in each of the two parts.
Vertical axis = Number of teeth in rotating part. Horizontal axis = Number of teeth in stationary part.
Colored lines show common rings and wheels in Spirograph sets. I’ve made a more compact version of this table for Spirograph only. The larger numbers in this set, 312, 336 and 360, correspond to some of the Super Spirograph layouts. See this post on Super Spirograph by the Numbers for an explanation.
You can also view the spreadsheet in Google Docs where the header row and column may or may not stay still for you, making the chart easier to use.
With thanks to the following (visit the links for more details)