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Really Useful Robot Arm (Patreon)

Published:
2021-02-18 15:26:52
Imported:
2023-04

Content

The RUR Arm is being built. It's looking pretty substantial so there's not too much bend in it. I'm using the Dynamixel servos that ROBOTIS sent me - I posted some pictures and details further down my Patreon wall.

It won't be next week's video for Patrons though, but should be the week after. Although, there will be at least two videos about getting it all up and running, and more after that to actually make it do something.

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Comments

Anonymous

RUR is a great acronym for the project, a nice callback to the origin of robots in the play by Karel Čapek.

Anonymous

I started building my own RUR based on the ideas you put forward, but with a tighter budget. So the Dynamixel are no option. Drive platform is an old Hoverboard (balance board) there are a few hacked firmware projects out there and they work great. Also I got a lot of these wheel motors for very less money.

XRobots
>>53892726

Yes, I'm aware these servos are expensive, but I guess it could be done cheaper.

Anonymous

what made you decide to go for servos as opposed to steppers? from what i understand, steppers are great for accuracy, seem to be cheaper, and have high holding torque/hold position when turned off whereas servos do not. it seems the only advantage of servos is speed?

Anonymous
>>53892726

If I remember right a few months back James did a video on how to make a windshield wiper motor work like a servo. Or is my memory failing?

XRobots
>>53905573

Yes so ROBOTIS gave them to me, but also they have absolute feedback, steppers would generally require an additional feedback encoder or you'd need to use a home switch on every power up. Also Dynamixels have the controller built in - which is basically an ARM Cortex so they are pretty powerful - you can control a lot of parameters and also read data back such as current monitoring. They all daisy chain on one serial bus also, so it's a pretty good solution.

Thomas Messerschmidt

Looks great! By the way, what is the green sheet sheet with the grid under it? Looks like it would be really useful to have around.

Thomas Messerschmidt

Ps. I am building a really useLESS robot arm for my fembot. Only two degrees of freedom and can barely lift its own weight. Still, I just ordered a 400 kg-cm servo motor from Amazon for just $188 USD. Hopefully it will allow the arm to be more useful. Unfortunately it won’t arrive for at least 6 weeks. It’s common directly from China.

Thomas Messerschmidt

Actually $118. From Amazon.com, “JMT 400kg / 200kg High Torque Metal Brushed Servo Steering Gear Suitable for 12v-24v Large Robot Arm DIY Models UAV (400kg)”. I will let you know how well it works. Also, I am going to post a review on my channel when it arrives and I get a chance to test it.

Anonymous
>>53905573

Ah I see, yeah having all that functionality built in so you don't have to reinvent the wheel is Def a big plus. Also them being free

XRobots
>>53917914

Looks interesting - I'd be interested to know how much backlash there is and what accuracy is like over it's entire motion.

XRobots
>>53905573

Yep - it's really easy to build a robot with them, they aren't cheap, but neither is the whole robot particuarly.

Anonymous
>>53917914

I would be intrested in seeing that review, whats your channel?

Anonymous
>>53914159

Cutting mats are also known as "self healing mats" are often used by artist as you can use a razor blade on them and it doesn't seriously damage it. They are also slightly heat resistant so electronics can be soldered on them and it won't damage your table top. Most art supply stores carry them.

Anonymous

Hey James, have you ever heard of the Capstan Quadruped? https://youtube.com/shorts/p5eoATIirSU

XRobots
>>54122584

Yes I'm following it on Instagram. I'd be interested to see how well those 3D printed capstan reductions work out when it's supporting its weight. I guess they could easily be upgraded to metal though.