High reduction ratio planetary gear drive model

I made this model with my 3D printer. If you'd like to make one, all necessary files are available here:

http://www.thingiverse.com/thing:30615

The tube cutting tool files are here:

http://www.thingiverse.com/thing:30619

• Category

  Education

[aMammoth]

Very cool design. Sadly, in a lower tolerance application, I could see it not working.

[Matt Keveney]

Someone brought this up on Thingiverse as well. My reply:

"Yes, strictly speaking, the planet gears should have a step in the middle, with a slightly different diameter where they intersect the driven ring, and the sun gear should only intersect the half that meshes with the stationary ring. In this model, the difference is well below the manufacturing tolerance of the gears."

See the rest of the discussion on Thingiverse for more details

[fb39ca4]

Looks like a similar concept to a harmonic drive.

[Kevin VR]

You would need more torque, more power. So the efficiency would be kind of low. But it's possible

[Kevin VR]

1+10 / 30 = 0, 3666..67 , so you always have to multiply it with 10? To get it to a scale to one?

Sorry for my English.

[chin keong Lam]

I would like to know which kit did you purchase for setting up your 3D printer? Thanks

[pfnr37]

Can it be back driven? And why not?

[Tom Flock]

Took me a second to wrap my head around the concept, but once I did I realized how awesome this is. What a clever reduction.

[bootrix]

I love it and will print asap! Trying to teach my daughter about how gears work so this is perfect!! :). Thank you so much!

[uberdriven]

Woah! Impressive!

3:43 An engineer always does his own tools! haha

Thanks, I learned a lot :D