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Here's next week's video, early for Patrons. This one goes out on Tuesday 9th. 

I'm hoping to use something like this with Tensegrity for make another experimental shape-shifting robot, still giving it some thought at the moment though!

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Why this Robot Squashes Itself to Move

I've been thinking about building a soft robot for a while. Most soft robots use inflatable bladders to change shape, which are typically driven by compressed air. However this means that a source of compressed air, or an air pump is required, and that the robot be in an environment where there is air in the atmosphere. For undersea exploration or robots to explore other planets, this is an issue. I decided to build a robot which contains air, but never needs extra air once the robot is filled. The prototype actuator therefore squashes itself to cause actuation. Although my power to weight ratio is not optimal, this works well as a gripper or manipulator. Videos featured: youtube.com/watch?v=XqgbLb8m77U youtube.com/watch?v=iwQRYzLZvGE 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 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

Fun! I wonder if the rigidity of the pressurised tubes could be increased by rolling the ends onto a spool rather than clamping them, as that way you can vary the pressure by changing how much you roll them depending on how much torque of the winding motor mechanism has.

XRobots

I thought about rolling them around empty filament rolls, it's something else I'll look at though.

Anonymous

Can I ask how you did the power system and if you're happy with it? It sounds like you plugged the arduino into a computer to power it, and the lipo directly to the servos, splitting out the lipo wires into many wires to go to the servos? I'm working on a quadruped with 12 servos and splitting out my lipo into 13 +/- cables, to power the pi (through a UBEC) and servos, but not too happy with that solution right now as it seems sketchy, and also I worry that not all servos get the same current supply at once.

XRobots

Yes the Arduino is powered by the PC which is sending serial commands. The servos are powered directly off a 7.4V lipo (which they are tated for). There is a common ground between the Arduino and servo power.

Anonymous

Hi James. I should have joined your patreon sooner. Btw in case you wanted more flexibility of design regarding the tubes then I can suggest welding sous vide pouches. I've made a few inflatable designs using them and they have a number of advantages. Firstly they're designed to be airtight, so the quality of the plastic is better than similarly thick plastic. Secondly they use a PE inner layer, with a nylon outer layer. The difference in materials means there's little risk in making a hole if you use a welding iron set between their melting points. I used potato paper stencils, to ensure the shape I wanted, as they can be washed out with water. I also experimented with using a diode engraving laser to weld the layers. I placed the plastic layers on top of a piece of black card, and then sandwiched them between 2 borosilicate glass sheets. The laser heated up the card, and the plastic in contact with it then melted. It actually worked surprisingly well. Overall it didn't work out for my purposes, but you might be interested in trying it. I moved on to 3d printing nylon inflatables as part of building pneumatic artificial muscles. Once I get my E3d toolchanger up and running I hope to do some more tests.

XRobots

Thanks for that and thanks for your support. I'll look into that for the next iteration!

XRobots

Quite possibly - I'm pretty sure the content is made week's or months in advance.