desinc???

@@Neon-ws8er he do be watching UKposts videos

👀

muscles would be the motorr in a robot, however when it comes about motion, animal human, the most powerful fuel is oxigen, compressed air, people of robotics should consider this, the wire hacks and installations, soon will become the next issue to deal with, however by now, the best approach possible.

hi desinc

Don't worry, you didn't come across as critical. You're right about the applications. Some of these issues will be mitigated when I fin sensors to turn it into a closed loops system, but I agree that this approach will not work for higher payloads.

@@roTechnic for a heavy duty arm, the motor is negligible compared to the payload. To be honest your design is backwards

Both of your comment and video are helpful. Thank you.

@@roTechnic you could still overcome the limits on the 1st and 4th axis created by the wires getting wrapped up. 1st could have the spools and motors mounted there since weights not an issue that low down. but the 4th could be bridged with a freely rotating tube around the joint each end being a wire spool. as the joint turns its rotation relative to the spool would be the same as the spool being driven since the tube will be held stationary by the spool on its other end, so you drive that spool the other way to counter keeping the axis this whole line is running still while the 4th turns. this way the 4th can turn as much as you want without anything tangling, it'll just run the wire around one spool as fast as the motor turns it back. and you can nest this inside another of the same mechanism to run both 5th and 6th axis. im too tired to explain it well so heres and imgur link to a doodle imgur.com/a/GgBRnoJ

thanks. yeah, couldn’t help grinning at the end!

Are they though? Like really? This is sort of the equivalent of having a whole pile of small muscles in your chest somewhere and just having a skeleton with some skin on it past your elbow. Also, in terms of trying to replicate how human hands move, this has been the preferred way of doing it for at least 50 years. It always disappoints me that just because people are seeing something, personally, for the first time, they think that its the first time that thing has been done.

As if the human anatomy was the epitome of efficiency and ability. The human body is extremely flawed and limited. It is not the bar that should be set for mechanical devices.

@@htomerif That business of saying "I can't imagine anything better than this!" is just human, gotta be take the time to show where the path to all the other stuff starts. You have to experience reactions being wrong a few times before learning to allow for more outside what you're seeing that's so exciting. You will have done it yourself when younger and I guess haven't noticed moving on from that . So, teach patiently. With regard to this specific reference to anatomy, you could look at the forearm where the muscles that do most of the movement of fingers are most of the way up to the elbow with long tendons reaching into the hand. Wiggle your fingers while you grip the elbow end of that forearm with the other hand and you'll feel the muscles doing their job.

@@DavidThornley No, this "I can't imagine anything better than this" definitely isn't "just human". Its "just lazy" and "just ignorant". This person is almost certainly a grown adult and this person has seen, probably in person, demonstrations in school on field trips or whatever of exactly what I'm talking about. I've spent days researching and going over things like the finer points of the longevity of molten fuel nuclear reactors or the thermodynamic efficiency of unducted, multistage turbofan engines with people who are actually interested in *learning*, but when I encounter someone who clearly just pressed the "toilet flush" lever on their brain the instant they left high school, I don't feel even the slightest obligation to rectify that lost cause. If you want a good example of how this person is ignorant of everything that's gone on in the world, look at the Honda ASIMO. Its been around and been iterated on for 20 years and been in development a great deal longer. Its far more human-like than this robot arm. Before you get the wrong impression though, hobby robotics (which I obviously do myself) have a real problem when it comes to cheap, accurate, compact actuators. We don't have anything to bridge the gap from RC servos that have been around since the 80s to AC servomotors (which have also been around since the 80s). I'm not knocking what this guy has done at all. I don't think it fits and its definitely not new but he's trying to address a serious problem in robotics for people who can't blow $20,000 on an industrial grade robotic arm.

Thanks!

thanks. the main drive behind the design is the idea of simplicity.. keeping it as simple as possible - and then maybe upgrading parts and increasing complexity over time, but with each change being small and easily understandable

Thank you. Yeah, the way I'm approaching this is to do the minimum of coding on the arduino and then I can bang all the "intelligence" on the computer. Arduinos are cool and all, but python is SO much nicer than C :D

@@roTechnic That's really great. Just the other day I was trying to translate a relatively involved code from Python to C++ for a project and found it extremely tedious. I would definitely like to take the approach of doing the heavy lifting in Python and would also love to hear if you have a good source for learning how to integrate Python into the Arduino framework =D

@@curious_ben I'm afraid that I don't have any sources for what I'm doing. I normally just design up a quick DSL (Domain Specific Language) - in this case the stepper motor commands - and then write a quick and dirty parser on the arduino. As I keep the DSLs as simple as possible, I've never needed to use a library to parse them, a simple State machine, or in this case a couple of if statements are all I need. The Python side is even easier as it's just serial communication and building up the commands as strings. If you've got any specific things you'd like to do, I'm happy to help over email.

@@roTechnic Thanks! I'll send you an email🙂

Arduino is adding MicroPython language support to a select number of board models. Two Nano (BLE Sense, RP2040) boards and the Portenta H7 board to name a few.

Thank you!

Thank you!

Thank you!!!!

This has been done for a long time. Except it evolved to using water in the lines instead of string. Much more power transfer ability. Quicker response time. More efficient. Less likely to twist and knot etc. this is the old way of doing it. Hydraulics is the better way.

@@jacobleeson4763 thanks! That makes a lot of sense. I would imagine the coding for hydrolic to rotation is more complicated than the wire version but I'm sure someone has already figured it out.

They can also be applied to legs as well ! the Birdbot robot has motors only in the hip in upper hip , the leg itself is mostly just strings , no motors whatsoever

Thank you! yes, that was the first time I'd programmed in a series of moves, and I couldn't stop myself grinning!

thank you, much appreciated

I don't know if it was just me but I felt some Bob Ross vibes in his way of explaining 😀

Interesting. I’ll look into it. thank you

we need to collaborate on a mech suit frame

@@kingmasterlord i will add my grain of sand and say that the legs should be like the ones of Birdbot except bigger

Thanks Philip!

Thanks for watching!

Thank you so much!

You're the first person to spot the t-shirt!

Wow, thank you!

Yeah, it's been a while. Thank you!

Thanks Mickael! You're right, there's no easing on this at all at the moment. I'm hoping to include it as soon as I have the sensors in place, as they will need a complete rethink of the motion control.

Thank you!

@@roTechnic python code is not so clear from screen ,if you kindly paste it in comments

The CAD and code will be released in the next video!

thank you!

Oh wow, I'd forgotten about those. I remember lusting after them in the '80s!

yep, that's the plan for the next video!

Oh, nice. I'll look into that. Thanks for the info.

Thanks. Yeah, I did notice this. It was especially evident in my last video where I was using bicycle brake cable as the bowden assembly. With the fishing line having a much smaller diameter this is minimised, although it is just perceptible. As you say, a closed loop system should fix that. I'm just printing off the parts to attach absolute encoders to each axis, so we'll see if that fixes it!

That's a great way of looking at it!

Thank you! yup, magnetic encoders - AS5600s.

Yeah, it’s been a while, but I’m back into it now!

I certainly will look into it. I'd like to get this arm up to the point where it is useful, and then look into other designs for some components. What you're suggesting will fit really well into that. Thanks

Thanks. There's no backlash at all in the joints, but with enough torque applied to them, there is a bit of stretch in the lines. Not enough to be noticeable in normal use, but as I move the joints faster, it increases. Sensors should fix that though

oh, that's a neat idea! can I ask what arms you use?

@@roTechnic Mostly Kuka, some ABB arms as well. Don't know the exact models unfortunately.