Simple Planetary Gears
by jonducrou, published
Based off OpenSCAD code from thing:7390 (after cutting out significant portions of it - because the original thing is much more than a toy).
The gear ratios are very interesting, and (at least at first) non-intuitive, depending on the part that is held stationary.
With a fixed Annulus or Sun, this gives 1:6.
With a fixed Planet carrier, this gives 1:5.
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Pretty much has to be on a flat surface to be used. I have been meaning in revisit this and add a holder for the sun and annulus - but it's not high on my priorities.
I haven't got enough pretty colours - but check this out: http://www.thingiverse.com/der...
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