I would have a look at the Ferguson Orrery.

It seems someone agrees – http://lisaboyer.com/Claytonsite/mechanicalparadoxpage.htm

The Ferguson sun/earth/moon is irritating to an engineer since the tooth shapes cannot all be “proper” but with a bandsaw you should be in a better position than with standard cutters.

Cheers, Adam

]]>I too am trying to gather info to build an orrery. I’m a woodworker so I’ll be using bandsaw cut wooden gears. Alas, as a music teacher (we only generally have to count to four; well sometimes 5, or 7 for Stravinsky and the like) the mathematical calculations are beyond me. I want to build just a Sun, Earth, Moon model showing the correct rotation of the earth and the moon around the earth. What possible compound gear ratios could I use (trying to avoid tooth counts over 60 or so, and less than 9). I did try to download your calculator, but this failed. Any help would be appreciated.

]]>Cheers, Adam ]]>

I’m the guy who put together brassorrery.blogspot.com a couple of years ago. If you’re still looking to do this, I’ve just updated the site and added scale accurate 3d plans done in google sketchup. I’m planning to redo the orrery with a little more sophistication and needed to have more accuracy, so I put together the 3d model. A few people seem to be following these plans, there’s at least one person out there who is very nearly finished (and has done a much more sophisticated job than I did).

Cheers

Murray

Cheers, Adam ]]>

I have only just found your website after looking for orrery plans myself for a very long time and sadly coming up with nothing. I have found the sites you have referenced , and notes you have acquired very useful. I just thought I would thank you for this and ask how your orrery is coming along? ]]>