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Here's next week's video, early for Patrons. This one goes out publicly on Tuesday 6th September. I think there's quite a lot of potential for this type of mechanism, with some caveats ;-)

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Wave Drive - PREVIEW VERSION

I recently built an eight wheeled snake bike, and that was based on a smaller version I built some time ago. And before that I built a worm robot which moves by expanding and contracting. This is known as a system of Peristalsis, which from Wikipedia, is defined as a radially symmetrical contraction and relaxation of muscles that propagates in a wave down a tube. While I was researching these projects, I came across another experimental robot which uses a wave motion, with the wave running down its body, to propel it forwards. This is a bit like how snakes actually move, Well, the ones without wheels or legs of course. My original plan for this project was to make a surf board you can ride on the land, but using a mechanical wave like this to propel me along, and use a large set of mountain board wheels for steering. However, I thought I’d try to make a smaller version of this mechanism first so see where the potential problems could be. It looks like the mechanical wave is formed by a thing that looks a bit like a giant corkscrew, which simply rotates inside a flexible track, so I 3D printed a former which I used to try to bend some wire around. I wanted this to be quite stiff though because in my version it has to support the whole weight of the machine, so I used 4mm diameter stainless steel rod. This was pretty hard to bend into shape by hand, and my resulting screw shape doesn’t quite match the former or the original CAD design, but we’ll see what problems that causes later. You can support me on Patreon or buy my Merchandise: *************************** Patreon: https://www.patreon.com/xrobots Merchandise: https://teespring.com/stores/james-bruton *************************** Affiliate links - I will get some money of you use them to sign up or buy something: *************************** Matterhackers 3D printing supplies: http://www.matterhackers.com?aff=7500 Music for your YouTube videos: http://share.epidemicsound.com/xrobots *************************** Other socials: *************************** Instagram: https://www.instagram.com/xrobotsuk Facebook: https://www.facebook.com/xrobotsuk/ Twitter: https://twitter.com/xrobotsuk *************************** CAD and Code for my projects: https://github.com/XRobots Huge thanks to my Patrons, without whom my standard of living would drastically decline. Like, inside out-Farm Foods bag decline. Plus a very special shoutout to Lulzbot, Inc who keep me in LulzBot 3D printers and support me via Patreon. HARDWARE/SOFTWARE Below you can also find a lot of the typical tools, equipment and supplies used in my projects: Filament from: https://www.3dfuel.com/ Lulzbot 3D Printers: http://bit.ly/2Sj6nil Bearings from: https://simplybearings.co.uk/ Lincoln Electric Welder: https://bit.ly/2Rqhqos CNC Router: https://bit.ly/2QdsNjt Ryobi Tools: http://bit.ly/2RhArcD Axminster Micro Lathe: http://bit.ly/2Sj6eeN 3D Printer Filament: http://bit.ly/2PdcdUu Soldering Iron: http://bit.ly/2DrNWDR Vectric CNC Software: http://bit.ly/2zxpZqv Why not join my community, who are mostly made up of actual geniuses. There’s a Facebook group and everything: https://www.facebook.com/groups/287089964833488/ XROBOTS Former toy designer, current YouTube maker and general robotics, electrical and mechanical engineer, I’m a fan of doing it yourself and innovation by trial and error. My channel is where I share some of my useful and not-so-useful inventions, designs and maker advice. Iron Man is my go-to cosplay, and 3D printing can solve most issues - broken bolts, missing parts, world hunger, you name it. XRobots is the community around my content where you can get in touch, share tips and advice, and more build FAQs, schematics and designs are also available.

Comments

Anonymous

When I saw the title 'wave tank' I thought maybe you'd built something for testing boats! 😅

Anonymous

I love the concept :) Did you do any benchmark on how much it can drag with track vs with screws, and compare the electric use ? I've build an electric digger (1.5t) and power use of track for movement is just insanely high

Darius Zaerin

nice! that is peculiar and very charming. i like it! just trying to think about how i'd go about making a strong corkscrew for the larger version, 3d print wrapped in carbon fiber was my first thought, but the second idea i think is cheaper and better, especially since you can weld now! i bought a very cheap hoolahoop from amazon a while ago that was delivered in segments of curved steel pipe and you click one into the other. if rather than connecting them into a hoop you add a twist at each segment, i think it should form a nice helix, that you can then weld at the seams. might be easier and perhaps actually cheaper than bending it all yourself. and while writing this a final idea. possibly also a bit expensive but if you find a large diameter, tick walled pipe, you can cut the helix out of that with an angle grinder or plasma cutter if its metal. 3d printed reinforcement in segments on the inside should still help and not conflict. can't wait to see it go!

Anonymous

This one looks like it will be a challenge to scale up. A thought I had was to put rotary encoders or a magnets and a hall effect sensor on the idlers and use them to measure the idler RPM. The controller could use that to regulate motors speed to compensate for differences in friction and loading between the two treads.

Scott Cress

Interesting design. If you make this larger you may need to heat the metal to get it to form more easily. I would think the "screw" of the wave generator more of a like a rack and pinion. Also the music during printing and and the demo towards the end felt a little off, almost too perky or maybe it was too loud, dunno it just felt odd...?

XRobots

I was thinking about trying to pipe bend it with a jig, or actually make it with sharper angles in - so just cut joints welded together.

Anonymous

I like the idea of carbon fiber wrap for stiffness. I'm not actually sure how the loads work though. With a wrap the outer surface will not be that smooth.

the AC

This may be significantly unrelated but I'm curious if you've given any thought to magnetic motors in your projects (as demonstrated by Retsetman here and by many others https://youtu.be/DAWVetrtD9U). Obviously these motors don't work well under high load (and thus may not be a good fit for the kinds of projects you've embarked on), but the speed and nearly frictionless action is remarkable for potential applications where they can be utilized effectively. Maybe even dialing up the magnetic power to overcome some of the load/torque concerns.

the AC

Cool concept though. Great workthrough. Hope you can find some solutions for sturdiness and smooth operation.

XRobots

I'm pretty sure the smooth operation issue is down to not enough segments and the rubber feet.