Do-Nothing Machine

by RayRaywasHere, published

Do-Nothing Machine by RayRaywasHere Dec 11, 2010

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Do-Nothing Machine by RayRaywasHere is licensed under the GNU - GPL license.

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The Trammel of Archimedes is a device used to trace an elliptical path. It is sometimes made as a novelty and called a "do-nothing machine" or a "smoke grinder." It is extremely easy to print and assemble but hard to put down.

Wikipedia has an awesome .gif of it in action

The arm could be made more complex, to add a handle or pen holder, but my aim was simplicity. I didn't want to distract from the motion of the device.

Edit: Base-V2. Made some slight changes to the base. Fillets on some of the external faces to get rid of the sharp edges and smoothed out the internal sharp edge the slider would occasionally hit. This should give a smoother motion.


Print one base, one arm, and two shuttles. I recommend using multiply to make the shuttles as it does a better job printing the narrow rods.

You may need to file any rough spots off the tracks or off the shuttles.

Assemble as you see fit and crank to your heart's content.

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Would you care if I printed some of these to sell at a maker faire? I don't know what to make of that license.

this makes my adhd happy

Thanks for the model, RayRay! I created a SketchUp file that has all the pieces on the same build platform for a Replicator 1. You can download it from here: http://sketchup.google.com/3dwarehouse/details?mid=6b437d35bd92c630bb20f1fd301bea26http://sketchup.google.com/3dw...

You can use the new STL export plugin to export the SketchUp model for Replicator G/MakerWare: https://github.com/SketchUp/sketchup-stlhttps://github.com/SketchUp/sk...

Ha, that definitely sounds like Klutz to me! Good times.

Wow, thanks for the awesome thing! I just printed one at half scale using my MakerBot Replicator and it turned out near flawlessly with very minor sanding.

Printed well, but one of the shuttle rods snapped at it's base almost immediately. DONT_KNOW

While building the arm on a Cupcake, the extruder kept hitting the bolts on the standard build platform. Had to give it up for now. Might try making it a bit smaller.

This thing is awesome. I printed out one and I didnt need to file anything down. It all just worked right away. Thanks for the upload!

Aw geez, you beat me to it! Nice job though.

Fun! I remember making one of these out of legos - I think it was called a 'Kentucky do-nothing'.

Ha, that definitely sounds like Klutz to me! Good times.

Double-version with a spring could be my belt-idler for the x-carriage i`m looking for!

Do-nothing but span the belt! ;)