How Planetary Gears Work | 3D Printed Planetary Gearbox Design and Test

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Published 2023-07-13
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View and download the 3D model: bit.ly/planetarygearbox
STL files, parts list and more details ► howtomechatronics.com/how-it-works/how-planetary-g…

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Measuring tools used in the video (affiliate links):
Amazon:
Force meter: amzn.to/3FEUAnS
Digital dial indicator: amzn.to/3PDvSco
AliExpress
Force meter: alii.pub/6k0u62
Digital dial indicator: alii.pub/6k0utl

Parts list (check website article for full list, affiliate links):
Amazon.com:
6mm Steel Cylinder Rod: amzn.to/3POEqfr
8mm Bushings : amzn.to/3Jnbk4x
Bearing 25x37x7 6805-2RS: amzn.to/44raQUL

AliExpress:
6mm Steel Cylinder Rod: alii.pub/6f4xwg
8mm Bushings: alii.pub/6f4vt7
Bearing 25x37x7 6805-2RS: alii.pub/6qos87

3D printer used for making the gearboxes: amzn.to/3HR7emJ

In this video we will learn what is a planetary gear set and how it works, as well as explain how to design our own planetary gearbox and 3D print it so we can see it in real life and better understand how it works. At the end of the video, we will also do some backlash and torque tests to see how well it can perform being a 3D printed gearbox.

00:00 What is Planetary Gear Set?
03:37 Two-Stage Planetary Gearbox Design
06:56 Design Rules
08:38 Gears Module
09:15 Designing the Gearbox
12:45 3D Printing
13:25 Assembling
17:22 Backlash Test
19:22 Torque Test

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All Comments (21)
  • @MrAlex3461
    Thank you for not only providing the design for free, which I am most of the way through printing on a 1mm noz. but also for providing an article that I can read and follow instead of the video. I prefer it.
  • @jakabgipsz4788
    The only thing the world forgets is that it owes it all to a Hungarian engineer inventor called József Pigeon. He left Hungary for the World's Fair and stayed in America. He became a collaborator of Henry Ford. One of the Ford T. models received this kind of gearless drive. By gradually braking the outer ring with a lever-operated fairing, the car went faster and faster.
  • @ArnaudMEURET
    Very good coverage of a well-known design. Done better than most other channels. I bet this is an interim video before a bigger project is revealed! 😉
  • @LeesChannel
    One of the contributing factors to the low efficiency of the planetary gearbox is the helical gears. Helical gears, due to their nature, cause axial load. Straight cut gears would be more efficient, but less durable because only one tooth is engaged at a time. An interesting compromise would be herringbone/chevron/double helical gears, in which the axial force is the same on both sides of the gear. It still has the advantages of multiple tooth engagement, and quieter operation, but with a neutralized axial load.
  • Thank you. This was very easy to follow and explained the subject well. Good job! I appreciate the tests and measurements you did at the end. That's the best kind of science.
  • @VideoGems117
    I've been trying to learn this for a year. Your video is the first on YouTube that's made sense. Thank you so much for including the equations
  • @Leroys_Stuff
    Impressive gearbox there these are in everything they work so well
  • @NavySturmGewehr
    Unbelievably impressive. I've been looking up the math on planetary gear boxes and walking away frustrated. This video is in a class of its own. Sub'ed!
  • @mattw7949
    Another top-notch video. Great work.
  • @rodriguezangel62
    Awesome video! I think we’d all love a comparison video of this and a V2 design a bit more optimized for efficiency. I wonder how high you can get and how impactful different design changes can be.
  • @user-le5zs5gk2z
    great video! a comparison of harmonic vs cycloidal vs planetary gearbox ,all 3d printed would be cool!
  • @DanielBulyovcsity
    You could stick 3 of these together and use it as an astrotracker for star photography once you polar align it.
  • @glenmiller1437
    That was really well put together. Great explanation of the design and results.