by Kepler, published
This thing is designed to work with a Futaba 3003 servo (modified for continuous rotation) and uses O-rings to make up the transmission and the caterpillar itself.
Transmission O-ring: 3mm thickness, 60mm diameter
Caterpillar O-rings: 3mm thickness, 124mm diameter
This O-ring system was chosen because it was easier to prototype, but it has evident drawbacks. In future revisions I will change it to a "solid" rubber track.
Note that the pictures of the printed robot at the bottom of the page are missing the reinforcement parts. I will upload new pictures as soon as I modify it!
Video of the robot in action!!
youtube.com/watch?v=efXHjjU-yYg (Simple test)
youtube.com/watch?v=mVgXtljqaAQ (Highest inclination: 36Âº)
Uploaded an HD artistic rendition of the UniTrack created by my brother Hasier Goitia. Expect more images and videos after the Easter Break!
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Yeah, sorry for the delay! Exact measurements were not a big concern in this project, so I did not really bother documenting the dimensions of each piece and the assembled robot. The final dimensions are roughly 180x60x50 mm. Like avalero said, you can always download the .scad file and modify the design to fit your needs. However, if you are going to use the same servos, it cannot be made much smaller or larger (The design I uploaded is close to the smallest possible configuration to fit all the parts, and if you make it much bigger the robot becomes impractical) Whatever you do, make sure to let us know!
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Lego axles can be used for the front and back wheels.
I have included the openscad file, but be warned! I tried to make the whole thing parametric, but since this was my first project it turned out to be a mess. I just uploaded it in case somebody wants to render the whole file (F5) and be able to take a better look at how it is supposed to be assembled. If you are brave enough you can search for "Main Parameters" and play around with those, but all the parts will probably not fit together any more!
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