Gear Draw

by Snille, published

Gear Draw by Snille Aug 19, 2012

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Gear Draw by Snille is licensed under the GNU - GPL license.

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An art toy to be used to draw patterns on a paper. In the SketcUp file there are different sizes of the big inward gear.

Update: A friend found the real name of the thing its a: Spirograph - http://en.wikipedia.org/wiki/Spirograph
I didn't know that when I made it. :)


Print and enjoy. :)
The stl fits on a 140x140 Huxley bed.

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Very nice and fun! That said, I don't think these are made with the right ratio of teeth.
When I used this as a kid, as you continue to move around the circle, it would continue to offset itself to make a pretty design. This doesn't happen with this set because the teeth ratios are evenly divisible.
For instance:
Main outer cog: 120 teeth
XL Cog: 50 teeth (divisible after 5 revolutions around the outer cog)
L Cog: 40 teeth (evenly divisible)
M Cog: 30 teeth (evenly divisible)
S Cog: 20 teeth (evenly divisible)
XS Cog: 15 teeth (evenly divisible)

So the only cog that is interesting is the XL cog. All the others just meet back up at the same place after one revolution.
Should maybe the outer cog have 1 - 3 fewer or more teeth, to make things interesting?

Correct, there would happen "more" if the teeth did not match. :) However, it was just made for fun and I did not calculate anything when making the gears. Just made them. :) It's good that it's easy enough to make your own gears. Just use the sketchup gear plugin and create the gear you want. :)

Okay thanks, will try it out. I'll probably have to experiment a bit to find a good offset

What is the pitch and pressure angle for the gear models in this set?


Pitch I don't remember. I basically left all at defaults in the plugin in SketchUp when I made the gears. I do know that the pressure angle is 20. :)

I want another outside gear so I can get more variety from my existing set. Maybe a little smaller.

There are two outside gears available in the SketchUp file. Then if you want you can use the Gear-plugin to create a new one at the size you want. Here you can find the gear plugin: http://www.ohyeahcad.com/download/http://www.ohyeahcad.com/downl... and if I remember correctly I used this formula "Teeth / 2 = Diameter". So if you want 100 teeth the diameter is 50mm. :) Pressure angle I left default (20.0)....

If I remember right, the original outer ring had holes for push pins such that the paper and ring could be fastened to a piece of cardboard. This would help keep the center as different gears are used..

i have played with this as a kid :) now i shall print it :D

I thought the SAME thing(:

Everytime I see a Spirograph I think of the quote from the simpsons.

Dr. S: Wait: did you know that there's a direct correlation between the decline of Spirograph and the rise in gang activity? Think about it.


The original Spirograph gears had the holes laid out in a spiral, to maximize the number of variations available on each gear. It might be interesting to try to do that with these designs. Many thanks for bringing us the ability to tinker with the design ourselves.

Technically called hypotrochoid or epitrochoid. I see you are using sketchup but if this was parametric...oh the possibilities!

Which software you are using for the gear design.

I'm attempting to print one right now. My build platform is only 120x120 so I had to scale it down a bit. Hoping it still works slightly smaller.

Even scaled down it seems to work pretty well.

Very cool. I used to spend a LOT of time with the Spirograph! It's cool that you invented it without knowing about the original.

I agree! Here is a pat on the back for re-inventing it, it means you can come up with awesome ideas! pat :)