Wobbly - The Slope Walking Automaton

Created by cevinius, source
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created 18/11/13 09:29


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See a video of Wobbly walking here: youtu.be/DtdJB49f4Yk

Wobbly is a toy robot who can walk down slopes. He is purely mechanical and made up of 3D printed parts. (He does not need a wind-up motor, nor batteries. He runs on gravity.)

You will need to provide a coin to put in his jetpack to act as a weight, and you will need to glue his head onto his body. Besides that, everything else is 3D printed. [In the video, I blu-tacked a coin onto his back. You can now use the Rocket Pack accessory instead of doing that!]

Check out the Instructions tab for details on how to put him together and for tips on getting him walking. (He can be a bit shy about walking when you first assemble him, so please check out the tips. I'm sure you'll get him walking in no time. He just needs to get to know you first. ;D )

Wobbly was inspired by an awesome wooden, ramp walking automaton created by Roberto Lou Ma. You can see Roberto's automata, and his instructions for making a wooden one [here]( blog.dugnorth.com/2010/09/wooden-ramp-walking-robot-toy.html). As I don't have much wood working skills, I thought I'd try to create a fully, 3D printable version. Wobbly is the result.

I hope you have fun with Wobbly and please post a comment or pictures if you make him! I would love to see Wobbly's brothers/sisters.

[Updated 29 Oct 2013 with shorter description and clearer instructions.]

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Instructions

Print out:

- 1 x Head
- 1 x Body
- 2 x Arms
- 2 x Legs
- 2 x Arm Spacers
- 2 x Arm End Stops
- 1 x Rocket Pack

There 2 versions of the Rocket Pack. One is designed to be printed upside down to reduce the amount of over-hang. The upside down version may be easier to print on some printers.

The Body and Rocket Pack will require support when printing.

The Head should be glued onto the body.

Then, assemble the parts in the arrangement shown in the photo. They just slide together. The Arm End Stops are tight fitting and go on last to hold all the pieces on the axel.

When putting on the Arm End Stops, ensure that things are not too tight. The legs should swing easily and freely. Also the arms should be able to move but should stay in position when they are lifted up.

The Rocket Pack hangs of Wobbly's back. Insert a coin into the Rocket Pack to use as a weight. The extra weight is needed for Wobbly to walk.

After assembling, it's time to test and tune!!

- You will need to play with floor slope gradients to see what works best.

- Also, the surface needs to have enough grip so that Wobbly doesn't slide down, but should not be too grippy either! (I found a piece of cardboard worked well.)

- You may want to play with the arm positions to help him balance. (E.g. if he's falling forward or backward.)

- The coin in the Rocket Pack is needed to add some extra weight. As an alternative, you can also directly Blu-Tack a coin or some other weight onto Wobbly's back.

- The amount of weight needed will depend on the gradient of the slope and on your Wobbly's weight distribution (e.g. what filling you used to print). Try using different sized coins, or if using Blu-Tack, try moving the coin's position up and down.

- You will need to play around to figure out how much of a nudge to give him to start him moving. I found that thumping the ground was a good way to give him a gentle nudge, and that sometimes seemed more reliable than pushing him.

- Just play and have fun with tuning him. I'm sure you'll get him to walk well in no time. :D


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arm-v2.0-rounded.stl
(ver 1)

armendstop.stl
(ver 1)

armspacer-v1.1.stl
(ver 1)




rocketpack-moddedforprintingupsidedown.stl
(ver 1)

rocketpack.stl
(ver 1)

Latest Changes

Nov 18, 2013

  • Add file armendstop.stl
    By mirror at 09:29
  • Add file rocketpack.stl
    By mirror at 09:29
  • Add file armspacer-v1.1.stl
    By mirror at 09:29
  • Add file leg-v1.1.stl
    By mirror at 09:29
  • Add file body-v1.1.stl
    By mirror at 09:29
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