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Gear Relation for Internal Gear aka Spirograph

Hi Team,

I have developed a SpiroGraph that has an adjustable outer ring which auto generates the gear teeth depending on ring size which works great.  However I cannot work out how to animate the rotation of the 'Spiral' Disc within the outer ring.

I have watched this tutorial https://cad.onshape.com/help/Content/materelation-gear.htm but it does not help as I cannot work out how to place the Revolute Mates.

I want the inner disk to move around the outer ring, which I can do using a Tangent Mate, but I also want it to rotate as though the gears were meshing and making it rotate.

Here is the link to the document https://cad.onshape.com/documents/a7d99d6fd77f3294449b23d2/w/856a3f5fad3c42ab9a79fd16/e/a6e7f9715e7b65f03cce206d


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