Copernican Planetary Orrery (Gears for Venus)
Tonight, I spent a little bit of time on the wooden orrery (See post below for description) and finished up the gears for Venus. These are the last speed multiplying gears (the final gear spinning faster than the driving gear). There are 39 teeth on the drive gear and 24 teeth on the gear connected to Venus. Since Earth's gears will be one to one, this gives a ratio of 24/39 compared to an Earth year. Multiplying by 365.2425, this gives Venus a orbital period of 224.76 days. In actuality it is 224.70 days. This gives an error of 1 part in 3700...even better than the gears for Mercury.
The gears for Venus out of 1/2 inch ply
Stacked on top of the Mercury gears using coins as spacers. They are raised only slightly more than they will be when finished.
Side view of gear stack.
Popular Posts
-
This post is going to be on 3D fractals cut on a scroll saw. (Thus the title of course.) As some of you know, I'm somewhat addicted to... -
I've been a big fan of M.C. Escher's Art since I was a little kid. His impossible figures drawings are mindblowing and his tesselat... -
It's the middle of April and this next week all students at University Preparatory School , where I teach, will be taking the California... -
I've always been interested in maps and different projections and how they make such a difference in the way the world looks when a sphe... -
I ran across an article a couple of months ago talking about an artist making cityscapes using staples to build the buildings. The cities w... -
A couple of weeks ago, I suddenly had the idea to make the Platonic solid s out of pennies. I'd made them before out of paper in severa... -
I've been a big fan of George Hart's geometric sculptures for a while now and so a few weeks back I decided I would build his Frabjo... -
I finally finished a papercraft project I've been working on for about a month. It's made up of parts of 29 sheets of cardstock. I... -
This post combines two of my hobbies, making things out of paper (papercrafting) and exploring and building fractals. For those of you that... -
I spent a little bit of time on the wooden orrery today. Click here for the original post and description . Two more sets of Gears are done...
Subscribe To
Posts
Comments
0 comments:
Post a Comment