Virtual Sphere Rolling Joint Robot Arm (DYNAMIXEL + OpenRB-150)

[@Skyentific]

In order to finance my KZbin channel and my projects, I am starting the consultation in robotics. So if you would like to ask me questions about my builds (or about your projects) you can do this through my website ( www.skyentific.com/book-online ). This service is not cheap, because I would like to limit it (with lower prices I would have to do this all day long, and I would not have time for projects/KZbin). And of course, I cannot guarantee that I will be able to help you during this consultation, but I will do my best.

[@vip8877]

Я даже не сразу врубился, что видео на английском языке)) Русская речь на английском языке))) мне понравилось, спасибо!

[@notepadgamer]

Watching these videos is definitely a highlight of my day. Always impressive seeing 3D printing used in such a versatile manner

[@StefsEngineering]

The inverted movement reminds me of GLADOS. Cool concept, thanks for sharing! Remember, the cake is a lie!

[@markTheWoodlands]

This is a fantastic way to teach the concept of adding degrees of freedom incrementally to an initially simpler setup.

[@Rudmin]

The biggest drawback of the “quaternion joint” is that it’s not actually kinematically defined with true rigid bodies. It relies on tiny amounts of joint slop and elastic deformation to act as a joint.

[@tariq7772]

Lol, I spent an entire weekend in Fusion 360 recently "inventing" this very same basic joint structure. It goes without saying that there is nothing new under the sun and brighter minds have usually tread the same ground. Keep up the great work and thanks for sharing!!

[@dm5rkt]

Also have a look at Mark Rosheim's Omni Wrist 3 mechanism.

[@tariq7772]

@@dm5rkt Thanks! I just uploaded the concept I worked up. It moves in 3DOF, but would require linear actuation/artificial muscles to control. Not sure how practical. kzbin.info/www/bejne/pYCmYXmuorJnjaM . If you have seen my concept worked out further somewhere, let me know. I am not trying to be original, lol. Just want a compact solution for a "shoulder" joint. Of course my joint suffers from multiple positional limitations.

[@abhiwins123]

One of the chief drawback from mechanical point of view is that at specific angle in 3d coordinate, there will be excessive torque needed for delta movement. Similar to knuckle joint strains at 45°

[@pauljs75]

If it were constrained by an extra armature, it seems it could be used as a constant velocity joint. But again it may be limited by torque loading... However I wonder if that could be worked from the other direction by using a CV-joint design that handles torque well as a robotic armature if it's not constrained like it would be on a vehicle drive line?

[@abhiwins123]

@@pauljs75 I liked the counter idea, its an idea worth exploring.

[@keixsy]

could someone explain this but for dummys? (me)

[@gamerfortynine]

@@keixsy The design allows angles with lots of stress against specific joints. I.E. too many hard materials to flex and distribute the stress accross the entire structure.

[@JinKee]

@@pauljs75 look up the Thompson Coupling from Australia.

[@jpsousa4]

I watched a video about rolling joints and didn't even learn how to roll a single one. Kidding, this is a really cool mechanism. Thanks for putting this video together! :D

[@michaelrichey8516]

Your test at 17:00 is the money shot! That's the one I was waiting for - stable platform rotating is sweet! Well done!

[@evanrinehart2733]

Thanks

[@NathansBarelyUploads]

Women are going to love this

[@strangeluck]

Fascinating point you made that because you're using three motors for two degrees of motion you can use the servos to eliminate backlash. Also like how this design lends itself to easy cabling. Very cool. Thanks for sharing.

[@PunakiviAddikti]

This is a great demonstration of inverse kinematics as well.

[@morphoice]

Literally the most fascinating mechanism I've seen in ages.

[@gendragongfly]

There is another benefit to this design, modularity. Your first 2 axis have the same configuration and the same hardware as the second 2 axis and so on.

[@Nobody-Nowhere]

joint rolling robot? finally a robot with an actual purpose

[@DanielRhoades4122]

That has got to be the absolute coolest robot arm I have ever seen!!! Now I want to print my own, lol. Thanks for sharing.

[@carlosmontgomery4178]

Fractal design! A larger one for the upper arm. Smaller one of the wrist. Even smaller still for a set of fingers!

[@ilkero1067]

Dear Dynamixel, hope you are reading this. I am already a fan of your products, using them for years now. It is great to see you support one of my favorite channels. Would be happier if you support this channel even more!!

[@Razzreal_plays]

Spoiler : I watched this whole video, that robot does not roll a joint. Much sad, very disappoint.

[@JinKee]

Add fingers in the next update

[@redbugg99]

Exactly it is a stupid idea ... and so unpractical.

[@THEOGGUNSHOW]

😂😂😂😂 😢 🚬 +🤖 = 🚭

[@mattdrat3087]

This, scaled down, would make for a fantastic animatronic puppet!

[@ps6k4trk33]

Very nice project, very interesting for solar's panel purchasing applications, congrats

[@Ron_DeForest]

This is amazing. Craziest joints I’ve ever seen.

[@ronalddriskill7360]

This is really high quality and informative. People like you make the internet awesome. Subscribed!

[@r5bc]

Can't wait for further development on this arm. Please keep up the good work

[@GameTL]

Thank you for the effort in explaining the concept in the beginnning.

[@aaronthomas8834]

This is awesome! It’s like a mechanical elephant trunk. It’d be awesome to see 10 of these joined together getting progressively smaller by a factor of 1.618. I’d love to see this in 6061 aluminum with the proper power and servos. This arm would be extremely helpful in space on the ISS or on a moon base. Imagine it on an automated gantry that can move in x y and z. It could put together entire habitats and move parts etc.

[@markusbuchholz3518]

Thank you so much for depicting your wonderful project. Your work and effort are oustanding. Your movies have been providing excitement and inspiration for so many years. Thank you again!

[@redmasterv2.031]

Perfect Russian accent Прикольная самоделка👍

[@ThisIsToolman]

Beautiful mechanism. Rigidity/stability will be the biggest challenge.

[@maxgood42]

Add the ‘Eye Ball’ to this, ….. “Its Alive”… And it’s a thing of beauty. 😎

[@RafaelSobral]

Valeu!

[@jach1969]

Thankkk uu for all your sharing with us ❤️🌹❤️

[@hardundware]

Wow. Very nice work 😳💪🤟👌

[@critical_always]

3D printers can give you a super power because you can explore all kinds of ideas relatively quickly.

[@juliusfucik4011]

True, but design and printing this in several iterations with a single printer takes weeks if not months. But of course, that is part of the fun too

[@critical_always]

@@juliusfucik4011 yes very true. It's the design and CAD skills that matter. I do everything in open source OPENSCAD as I refuse to commit my designs to rent software.

[@ObsequiousV4]

Definitely one of the coolest channels on youtube

[@yt45204]

Excellent CAD (Cardboard Aided Design)

[@pavelarhipov668]

Incredible... Only yesterday I thought about 2-dof joint realization..

[@LabGecko]

Great work! Seeing this illustrates just how much of an engineering leap it is to go from this to factory level robotics to Tony Stark style concepts.

[@vell0cet517]

I'd love to see how you worked out the inverse kinematics for this thing. That would be a great video on its own. These spherical parallel manipulators are just so mesmerizing to watch. They remind me of a delta 3d printer in some ways. Beauty and engineering. Well done. I think it'd be cool to stick a 360 lidar on the top of one and use it for slam mapping in 3d.

[@tracygilmore7983]

I would wonder about worm drive from continuous rotation servo motor ,bit harder to code , but better ratio and no backlash. Can't figure out if a compression spring rather than the carbon rod would be better - maybe on the outside? Give it that old Tobor look, .

[@Paul-rs4gd]

I sure hope Robotis gives you the extra 3 motors. I love the organic nature of the movements - it reminds me of an elephants trunk.

[@Smytjf11]

Need... more... degrees of freedom... This has been great, thanks for letting us into your dev process 😁

[@StephenMattison66]

TYVM for the brilliant lapel mic, your audio is superb!

[@davenarisotto3674]

That's a very cool robot arm! It looks elegant

[@roboage1027]

Very interesting design for the wrist joint of the robotic arm. I wish, I saw this video, before starting making my own robot.

[@henrimilo1]

Perfect for sun tracking!

[@themarsoff]

интересно у вас получается объяснять 👍

[@lyomon9981]

these are really diferent ways to make joints !!! amazing sir

[@leofernekes343]

What an interesting design- thanks for making this video.

[@SajjadHematiNourani]

you are a genius

[@CharlesVanNoland]

Beautiful and magnificent. I can't believe I've never seen anything beyond the literal rolling joint - with the cables/strings and also only with one axis. These multi-axis rolling joints are awesome. Great stuff!

[@FabriceCHERRIER]

It’s alive !

[@pitot1988]

This will be a nice mechanism for telescope array to track the sky the same time and moving more fluidly than conventional slewing

[@porkrinds9572]

Also looks like this could work as a sort of CV Joint with extended angular working range for delivering rotational force. Would need some serious reinforced alloy arms and tight tolerance bearings though. Absolutely love your videos, sir!

[@carlosmontgomery4178]

I asked the same question.

[@pauljs75]

Ditto on that. CV joints and "virtual sphere rolling joints" solve the same problem, just for different applications. And given the variation in existing CV joints, modifying one of those may suit this purpose in a more robust fashion.

[@clydecox2108]

Very cool robot

[@Skyentific]

Thank you a lot!

[@nyscersul42]

Dude clearly enjoys what he is doing hehe nice

[@scottjackson2812]

Really cool! You could add another DOF by putting the base on a rotating axis.

[@mountainlion4853]

Love it, love it, love it. You are doing a great service 😊

[@antonschutte3548]

bloody AWESOME!!!!

[@ozzietradie6514]

joint looks cool

[@qwertyzxaszc6323]

That mechanism would also be great for the spine of a robot, giving it a lot of mobility. Also, I wonder if this mechanism would be better if it is driven by cables rather than gears.

[@shahriarakbari6771]

It's just brilliant

[@porkrinds9572]

Perhaps the use of worm/screw type gears on the motor side would work better? Also have the added benefit of reduced play in the driven structures to act as a better braking mechanism...?

[@robinchazen159]

I was thinking the same thing, and drive them using cables (like a Dremel flex shaft) so all the motors are in the base. That will also cut down the weight of stage 2 and 3 drastically.

[@nob5000]

i like it! im sure it will lead to something very unique and useful

[@Just_An_Idea_For_Consideration]

This is AMAZING!!!

[@zeewaqarhusnain1060]

Brilliant.

[@thewatersavior]

Very cool board

[@justthinkingthoughts]

Just an idea, without undetstanding the geometrical operation in detail ... Couple the three axis with gears and drive two of them and let the third free spinning. Backlash elimination might bite the grass but you could use worm screws for the axis for better torque... Maybe the third axis needs a brake for holding

[@mickwilson99]

Fabulous!

[@vishvraval4079]

Use a seperate servo motor drive for better current distribution. Here voltage is not the problem, current is , current plays important role in providing torque.

[@skaramicke]

I would love to see this configuration done in aluminium and with greatly increased gear ratios. It feels like it could be 1:100 instead of 1:2, and still have usable top speed.

[@maxgood42]

Then mount it on tracks with a FLIR camera and let it roam around the streets at 3am .

[@ionutdimache3509]

You talk about harmonic drive? ;)

[@WikiSnapper]

That is really cool!

[@hubertseidl93]

very interesting robot, and as a huge space travel nerd, I see massive applications for it. yes, it struggles with movement, but that's under earth gravity. mars? moon? or free floating in space? suddenly, things change.

[@danielpotes8508]

Super Cool!!

[@tomsko863]

Add in a "Centering Spring". Just a piece of spring steel or coiled compression wire in the middle to give a restoring force to the assembly. Also look at joysticks and how they do it.

[@elrinstrongsword]

I love your work and would love to see this with CNC tool steel or titanium construction and capstan drives scaled up to enormous strength

[@PCBWay]

One more epic, thanks so much for bringing us this 👍

[@eurybaric]

Super cool!

[@raybrown5890]

beautiful!!

[@grendelum]

here i was expecting a robot arm to roll a joint… still very neat ;¬)

[@shakhizatnurgaliyev9355]

По записям было понятно, откуда у Вас такие знания геометрии...советская математика!!очень понравился проект особенно, когда запустили синхронно!применение думаю может быть различное!

[@Infoneson]

Extremely cool concept and design. I could definitely see this design in usage for deep sea/space exploration scenarios.

[@moshe778950101]

More gear ratio or possible worm and gear setup will ease on the servos. Would be lovely to see the maths involved.

[@StatueSounds]

Get this man some servos!!!

[@justin_704]

if you use elastic bands on opposite side of tension it will react as muscle tissue and provide the resistance you need ;)

[@pgarmul]

Brilliant

[@magnuswootton6181]

watch and learn this guy is good.

[@jeanbalcaen1917]

very organic moves, a joy too see :-)

[@DelforTecnoPrint3D.6730]

Excelente video. Muchas gracias. Saludos desde Argentina

[@vedertt]

Super works. ..!!!

[@danielb.2873]

Very nice design, love it

[@DrJeff-]

Brilliant, as usual. Love watching your work in Robotics!

[@dontolley1738]

Super cool. Thanks for sharing

[@marcfruchtman9473]

Thank you for this very interesting video.

[@JaiMalleshBabu]

wonderful video.

[@DestianLight]

Looks cool and very clever

[@fredericbenzaquine3510]

Very interesting !

[@C0MPLEXITY]

Thank you for explaining how it works. I hope you see success soon