Compound Gears and Gear Ratio Elevator

This is a remix of the Elevator of Terror from the #DCMakerBotMakeathon. The lesson plan from the Elevator of Terror is really cool, but the files were lacking, so I've created a set of files to support using the lesson plan that was created by TechEdSloth.

Using this project, you can create a #ScienceProject or #EngineeringProject that will help your students learn about gear ratios, compound gears, mechanical advantage and trade offs between power and speed. Students are tasked with creating a compound gear that can control the speed of an elevator in this model. They can use TinkerCAD to place the bore holes for their axles in the Base - allowing for appropriate placement of the gears in their gear train.

I have provided a series of gears of varying sizes and also provide a link for creating your own gears using a Gear Generator Tool that I adapted from John Wolter's Spur Involute Gear. The difference is that my Gear Generator Tool already has the holes for the axles of a 2mm drive shaft and the 4mm driven hex shafts. To try to reduce binding caused by flashing from the printing process, I also added fillets to the driven gears in the file, but not on the STLs themselves. You could probably accomplish the same by just lightly sanding the sides of the gears before construction.