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Triple gear

by henryseg, published

Triple gear by henryseg Apr 24, 2013

Description

[Video](http://www.youtube.com/watch?v=I9IBQVHFeQs).

In this unusual mechanism three gears mesh together in pairs, and yet they can turn!

If you take three ordinary gears and put them together so that each gear meshes with the other two, then none of the gears can turn because neighbouring gears must turn in opposite directions. Triple gear avoids this problem by having the three "gears" arranged like linked rings - the gears then rotate along skew axes, and the opposite direction rule no longer applies (although see also Oskar van Deventer's [Magic Gears](http://shpws.me/lrqz) for another possible solution).

This is joint work with Saul Schleimer. We were inspired by another of Oskar's designs, his [Knotted Gear](http://shpws.me/lmqP), which consists of two linked rings that gear with each other, and of course we wondered if it would be possible to do three linked rings!

[Paper](http://arxiv.org/abs/1304.6859) describing the mathematics behind the Triple gear, and how we designed it.

[Triple gear (solid)](http://www.thingiverse.com/thing:79310) is a non-hollow version, which should make it easier to produce on a home printer.

[Baseplate and axle for Triple gear](http://www.thingiverse.com/thing:78218) is designed to work with this, and gives a way to drive the gears using a motor. For axles without the baseplate or motor fitting, see [15cm axle for Triple gear](http://www.thingiverse.com/thing:79768) and [30cm axle for Triple gear](http://www.thingiverse.com/thing:79781).

Triple gear is also available at [Shapeways](http://shpws.me/mQ6F).

Things that could be improved upon:

* Make the motion smoother
* Less wiggle room for the gears - at the moment they can move quite far out of the 3-fold symmetric position
* Can the gears be made to rotate at different speeds?

Recent Comments

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I cannot wait to print this on the ProJet 3500 HD I have access to. This is TOO COOL. Thank you for sharing! I'll post photos once I have the print done.

Needed alot of cleaning but it prints ok in PLA on my Rep2.

Looks like it will need full support... giving it a try...

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License

Triple gear by henryseg is licensed under the Creative Commons - Attribution license.

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Comments

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royimous on Oct 30, 2013 said:

I cannot wait to print this on the ProJet 3500 HD I have access to. This is TOO COOL. Thank you for sharing! I'll post photos once I have the print done.

Andychn on Apr 25, 2013 said:

Looks like it will need full support... giving it a try...

Andychn on Apr 26, 2013 said:

Needed alot of cleaning but it prints ok in PLA on my Rep2.

eagleapex on Apr 24, 2013 said:

What are the tolerances on this part? I'm wondering how small I can print it before it fuses.

henryseg on Apr 24, 2013 said:

I think the gaps are pretty small, around 0.5 mm at the closest. I've only had it printed on an SLS machine, and there it sometimes needs a little prying apart.

Stuartblarg on Apr 24, 2013 said:

Wow this is super cool. I dont suppose you would be able to upload a version with the gears filled in instead of hollow? its just that as is, it would be very difficult for a home printer to handle. I presume that the one you have was made on a powder former type machine and hence doesn't need to build support.

henryseg on Apr 24, 2013 said:

Ah, good point. I'll see what I can do.

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