Let’s have a look at how to set it up inside Cinema 4D. This assures the cog teeth will perfectly intersect.)įrom this set up, we can get Earth going around the Sun, and for every revolution of Earth, the moon will rotate around earth 13 times which is just what we were aiming for. (For your big cog, you need to have a number of teeth that your smaller cogs teeth can multiply to. To achieve this, the 13 toothed cog will rotate around a larger cog with 13² teeth ( 169). We know the Moon will need to revolve 13 times as the Earth rotates around the Sun once, giving us our year. This first cog will sit underneath where planet Earth will be, and will drive the rotation of the Moon. You can reach much more precise numbers by adding more cogs of varying size, but this quickly gets complicated, and I’m a CG artist, not a mathematician or watchmaker! Keeping it simple, we’re going to need a Cog with 13 teeth.
Well, it’s precisely 13.336874634, so we have to round this number down to 13, as we want something easily divisible, and whole. We’re going to use 13 because it’s how many times our Moon orbits us (Earth) in one year. We can control this whole movement with a really simple 2 cog set up.įirstly, we need a value we can base our cog calculations on, this needs to be a whole number, as it will equal an amount of teeth on a cog. We’re going to focus on the Earth’s orbit around the Sun, and the Moon’s orbit around Earth. Lets first look at how cogs work in an orrery. We will go over it many times through this how-to. It’s simple and we’re going to take it step by step.
I based the solar system model around the design of his Orrery, and it functions in a very similar way, however our calculations are going to be slightly different. Now before we get into the 3D side of things, I want to give a shout-out to Dragonator on the Instuctables forum. Now for our 3D Orrery it’s possible to cheat it completely as we don’t need to be restricted by the real world limitations of cogs, but where is the fun in that? I thought a fun experiment would be to have functioning gears that drive the positions of the planets, as they would in reality.
It’s basically a mechanical model of the solar system, usually driven by a system of gears and cogs.
0 kommentar(er)
