Planetary Gear Demo
by 98jtmartin, published
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PRINT EACH PART SEPARATELY
The total assembly is there to use as a reference to the original design, the gears are not aligned in the total assembly, you have to set them individually
There are 3 Planetary Gears revolving around one Sun Gear. These four gears are encased in a Ring Gear, therefore creating the Planetary Gear system. This is just a small demo that I made from scratch, mostly using AutoCAD Inventor's Design Accelerator to create the necessary gears with the correct ratios, tooth count, and center/mount distance.
This small demo can be used for engineering teachers to show how gears can interact with each other to create different ratios. It can also show what ratios can be used more for speed and which can be used more for torque/power.
PRINT EACH PART SEPARATELY
They can be in the same print bed, but not as the assembled file
Make sure to print 3 PLANETARY and 1 SUN gear.
I don't really see supports super necessary if you orient the parts in the right way, you wouldn't need them.
Print 3 Planet gear and 1 of the sun
You may have to either shave off a small amount on each shaft on the "Pin Structure" OR bore out the hole on each gear slightly. When printed, it tends to be a little firm to put together and rotate
The original design of this was to have 3 "Planetary Gears" and 1 "Sun Gear" as the files are named. The sun goes on the middle peg, while the planetary gears go on the outside pegs. The ring then goes on the outside of all three planetary gears, and it should encase the entire thing.
How I Designed This
I am a very active member of my robotics team (I won't go too deep in this story, its unecessary) and I come in contact with gearboxes and gears almost on every meeting we have. So I kinda thought that making a small demo of a very basic planetary gear system would be perfect as one of my entries (I'll probably come up with more later). So I sat down and started figuring out the Design Accelerator in Inventor, which took a little time, but I finally got it where I wanted it, which created this.
Project: Basic Planetary Gear Systems
This simple design can be easily taken apart and put together. Students will be expected to learn the basics of how gears work and interact with each other. They can learn about how putting different sized gears with a different tooth count can affect the ratio of input to output.
This Project would be mostly appropriate for middle school engineering/robotics students and above (usually grades 7 and up).
With the project plan that I am thinking of, the students will need to know some basic CAD skills, therefore they require a computer, access to a 3d printer, and any form of CAD software that can be converted to the 3d printer programs.
Choose your favorite CAD software
Come up with a usable gear ratio with gears that can be accurately printed on your 3d printer (radius and tooth size)
CAD them all up, assemble to check your work (simulate interaction if necessary to check for correct meshing)
- Print all parts and assemble
The students should have designed and printed a basic, fully functioning planetary gear system. It should consist of, at least, 3 "planet" gears, one "sun" gear, a "ring" gear, and some way to support all four inner (planet and sun) gears at the required distance so that it will all mesh together and rotate together.
If students use the free (and easy, in my opinion) AutoCAD Inventor software, they can learn how to use the Design Accelerator to create gears that will interact with each other and work correctly. If they use this software or not, they will learn the basics of gears and how they can work together to create a basic gear ratio.
For grading, teachers can grade on:
How well the students use the software (3d printer and CAD) to create the Project
- How well the system fits together, such as gears meshing and correct ratios
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Planetary Gear Demo by 98jtmartin is licensed under the Creative Commons - Attribution license.
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- You must attribute (give credit) to the creator of this Thing.
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