This is brilliant, well explained, thanks Mate.

thanks for sharing. this robotic arm looks nice and handy to make

This is mad inspirational

Awesome work! The whole process is great to teach to mechatronics students.

Upgrade and complete the arm. Really great educational value.

Одлично објашњење, супер видео Обилићу, хвала и више таквих. 👏👍

i can't wait for the next video about this little robot arm

Great video. Interested to see this done with an esp32 or esp8266.

This is god tear educational content, thank you!!

You should redesign the inner bearing race to be, well, a bearing race. You can't combine a cage and a race or you defeat the purpose of the race. Bearing cages always float freely and must be able to move with the balls, not restrict their movements. The balls will orbit at essentially the average rotation of the inner and outer race, but this design prevents them from moving at all. Also, since this is a comparison with an existing arm, you should compare their performance (eg: lifting ability and accuracy).

many very good ideas. Bravo

Pretty cool project, and very good looking robot arm as well!

Nice video, thanks 😊

By hacking inside of the servo you can connects cables to the potentiometer inside and read data that way, its usefull when you need to be space efficient

Wow, this is really cool! Very good job. I am retired from doing software for 40 years and lots of hardware and software combinations. Now Retired, I just recently got into 3-D printing. And wound me up here. I never even thought of making such a thing until now, what would be the best robot arm you think I should build? Obviously, this one is really cool, but are there other ones that probably cost more money that might have a lot more features maybe? I see ones out there that are commercially sold kits that are too expensive, but they have cameras on them and various sensors which look really cool. Anyway, which robot do you think I should try to do?

Impressive!. Mechanical, modelling, electronics and coding. What 3D modelling app did you use for the the bearing?

I'm interested in how you record and play back movements? This would work well for a simple CNC plasma cutter. Just make a quick template with cardboard and then trace the template(record) and then play back while cutting.

Great job , thank you for sharing it I've question , with one is better use servo motor or stepper motor , i need Precision

Interesting project. There have been a lot of discussion over using stepper motors rather then servos, and I myself would have thought steppers would have been the better choice as they tend to have more torque and precision, which is probably why steppers are used in telescope mounts (HEQ5 / EQ6 for a couple of examples), and in most 3d printers and CNC / Plotters.

The Pocket83 channel has some techniques for sorting glass marbles to find a set that are as similar to each other as possible (e.g., you buy 100 marbles and select the most similar 10 of them).

thank you sharing, sub.

I think even if your were going to make your own bearing, just using cheap steel ball bearings in a 3d printed housing would be better, glass has a way higher coefficient of friction than polished steel

What did you use for the software..? Like the drawing/modeling etc...? And other softwares..?

Zdravo. Uh, prilicno skupa zabava iako deluje da nije, ali kada krenes da pravis nesto ozbiljnije, a krenuces sigurno, postaje bas skupo. Prvo kupujes one kineske, plasticne servo motore i onda shvatis da sa njima ne mozes da uradis nista, pa prelazis na skuplje. Mene najvise muci sto cekam po mesec dana da mi stigne nesto iz Kine i onda shvatim da su mi poslali pogresne lezajeve, pa onda opet cekanje od mesec dana. Ja sam pokusavao sa dva servo motora da pokrecem isti deo (okrenim ih kontra jedan od drugog) ali ovo plasticni motori nisu dobro, odnosno nikada ne dobijes iste, ali moze, bude jace kad napravis tako sa dva komada. Ali onda dolazi do problema sa strujom, moras jace drajvere za motore, a oni su dosta skuplji. A, lezajevi su takodje skupi, oni malo veci, ozbiljniji. Ja dosta koristim stepper motore iz onih starih, kvalitetnih stampaca; uglavnom su oni japanski Mitsumi, bas, bas jaki i kvalitetni. - Nema vise takog kvaliteta, rade u stampacima po 20 godina. ;-) Nisam siguran da sa Arduino-m mozes da napravis nesto ozbiljnije, suvise je slab, predlazem ESP32, jaci je a ima i 2 jezgra i mozes zasebno da ih koristis kao Task-ove. A, posto imaju i WiFi mozes vise komada da koristis, recimo jedan za prikupljanje podataka od senzora, drugi za analiziranje, treci za kameru, upisivanje logova na sd karticu, zvuk (mp3 player) i ostalo, a lako ih je povezati sa kompjuterom / telefonom. Mislim da ne mozes napraviti nesto ozbiljnije ispod 500 evra, a jos ako krenes da kupujes one Nema 17 motore ili jace, pa za njih trebaju kontroleri od 50-ak evra po komadu, ih, brzo se nakupi. Dok je hobi, sa ovim kineskim motoricima i senzorima dobro je, ali brzo dobijas zelju za nesto ozbiljnije. A, jos ako nemas 3D stampac, pa moras rucno da seces aluminium (kazem ubrzo se javi zelja za necim ozbiljnijim) to je bas muka i na kraju shvatis da si slozio ispod stola nekoliko hiljada evra koje ti stoje i skupljaju prasinu. ;-)

Hello my friend, I'm super interested in building one of these with the idea of exploring Google's Aloha information. I'm pretty sure the community can get together and build a super low cost version like your demonstrating here. We don't need many of the things that make it expensive. We don't really need to have it moving, it could be fixed. The data for tele learning/training is all open sourced, have you looked into it at all? If we could build a desktop mounted one for 1/10th the cost ($30k). They've done such a great job getting the cost down but I think the community could evolve it more. Thanks for sharing

Use bicycle headstock bearings - cheap and easy to source.

What 3D modelling app did you use for the the bearing?

have you try control it via voice commands?

which software did you use for 3D modeling and which 3D printing ?

Is there a benefit to using servos and potentiometers vs steppers and end stops?

at 27:30 when you explain how , when holding the arm vertically and seeing how all 3 motors are justs tacked upa nd the bottom one has to be strong enough to constantly belifting two other actual motors, uits liek seeing a 3d printer able to move all of its parts around liek a human arm and you have to rteally apreciate roboticas after realizing how much power and force you need to move a heavy robotarm, but if you want it strong it must be heavy lol

So many YT videos on 6/7DOF DIY robot arms, but not yet a single one that shows why you'd want one... (other than to have fun building it)

what software desgn do you use?

Actually, the marbles can't move freely in the bearing, because of the separators. The friction would be lower, if you just put them losely in, because then the only friction is between the glass marbles, which are smooth.

Robot is small scale version Stretch by Boston Dynamics?

make this an easy kit ali express can sell, so easy we can just pop it into a 3d printed robot arm and start controlling it with our smartphones, where all wiring is color coded or numbered and super easy instructions, like built into the inside of the 3dprint itself actual instructions lol, and the wires and motors all made super easy to install like building a prusa printer

Thats a cool robotic arm i know theorical physics so i can already imagine what its like to make my own after all Einstein was also a theorical physicist and he said himself that imagination is more important than knowledge.

why add a potentiometer to a servo motor ? it already has position feedback

This is louder than my Serbian neighbor. Cool project.

I must be weird as I have access to many many bearings but no marbles. I've lost them...

Can you implement it with Arduino mega pls help

I keep looking for a 2d paint spraying robot and can’t find one, if anyone one knows of a kit, video , anything please let me know

balkanac 100%

Sadly none of these affordable robot arms are good enough for any application other than for the sake of the project itself and looking cool. Above all I think it's interesting as a learning tool so in an educational sense it's nice to build an affordable robot arm. But beyond that there is just too much play and the end of the arm usually has way too much play and low repeatability. Especially during fast moves it takes a lot longer for the arm to stop moving when it halts and usually overshoots by a lot when trying to reach a certain point. Affordable robot arms suffer from a lot of backlash.

correction: an overly complicated robot arm.

Don't servos keep track of their own position? They have internal methods of doing that. Otherwise they wouldn't be able to self-center when you turn on the system (like for an RC aircraft control surface). You shouldn't need an external potentiometer. All you need to know is what position you *told* the servo to go to. And if the potentiometer is right there at the same joint and the same axis, it can't be any more accurate. You're wasting time, effort, materials, weight and money by adding the potentiometers. Especially when you take into account the built-in slop and inaccuracy of this kind of build. There are better ways of getting position feedback for more accurate and professional equipment, but that's not applicable for a cheap system like this.