Gear Ratio Demo

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I have been fascinated by gears ever since I got my first 3d printer and have been able to make them. So here is something I made recently that demonstrates how gear ratios work. This is a little self contained unit that holds three gears. Depending on which gear you spin, it demonstrates a 4:2:1 gear ration, or a 1:2:4. When you spin the top gear, you get a 1:2:4 ratio which means for every one full rotation the top(input) gear makes, the bottom(output) gear makes 4 full rotations. This isn't a practical build for anything other than demonstrating how gears can be manipulated to increase power from the input to the output. I have included three different boxes with different tolerances. Low, medium and high. 0.1mm, 0.15mm and 0.2mm respectively. I have also included two different gears, one that is just a gear, and another that has a little alignment mark so you can actually see the rotations accurately. The stacked gear box is not really designed to withstand the forces generated when driving the low ratio gear(the top gear if the gears are placed with the smaller gear facing upwards) so it works best when driving the high ratio gear. It can hold up to 14 gears which is a crazy demonstration to see just how little the last gear moves. Update 6/14/19: I added a new gear and a drill chuck piece. These two can be glued together and then you can drive the gears with a drill and really see how these work! Let me know if you have any questions or comments, or if anything doesn't quite work right so I can improve on this design.

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