Gear Ratios Educator Tool
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This is a tool that allows you to play with gear ratios to teach or learn how do they work.
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Model information
- Source
- Printables
- Category
- Physics & Astronomy
- License
- Creative Commons — Attribution — Noncommercial
Gear Ratios Educator Tool
With this tool you can set up gearing systems that can lift water bottles with just air. It's simple tool that clamps to a table's edge (if the edge is too rounded the clamp will not work you may double sided tape it to somewhere).
Hardware necessary
3 m3 nuts and 3 8mm m3 screws to attach the backplate to the clamp.

1 697 bearing for each main gear you want to use. (Compound gear only use 1 bearing)
1 15mm m3 screw, 1 25mm m3 screw and 2 nuts for each normal gear.

1 35 mm or longer m3 screw, 1 25mm m3 screw and 2 nuts for each gear that will contact a compound gear.

3 12mm m3 screws for each compound gear you want to attach to a normal gear.
3 10mm m3 screws for each spool you want to use.
3 15mm screws and paper for the propeller.
Example setup

This set up uses:
3d printed: base_clamp, screw, back_plate, 2x gear_mount_short, 2x bearing_screw_cone, 15t_gear, 45t_gear, 2x pulley
hardware: 6 10mm m3 screws, 3 m3 nuts and 3 8mm m3 screws, 2x (1 15mm m3 screw, 1 25mm m3 screw and 2 nuts), 2 697 bearings.
Video:
What can you add?
You can design things that can attach to the gears with 3 m3 screws like the propeller or the spool.
The screws holes fit m3 screws and they are 120 degrees apart on a 22mm diameter circle.
Gear settings:

If you are using Fusion, just change the number of teeth to add new gears. You will also need to create the holes and 0.5mm thick lip to the inside for the bearing to sit onto. I added a f3d for a example gear.