Stanford Pupper: low-cost quadruped robot

Post by taneq » Mon, May 04, 2020, 4:51 AM UTC

ipsum2 wrote: post #36

n0us wrote: post #8

> You can buy most of the parts directly from a reseller like Amazon or McMaster-Carr, but for some you’ll need to get them custom manufactured for you. The custom parts include the carbon fiber routed parts, the 3D printed parts, the power distribution printed circuit board, and the motors. Very cool and I would like to build this, but the "Nano Dog" is probably a cheaper and more approachable option for the garage…

I wasn't able to find any examples of this quadruped walking.

Post by t_von_doom » Mon, May 04, 2020, 5:20 AM UTC

rspicer wrote: post #20

andybak wrote: post #11

Earlier quoted context omitted.

> the "Nano Dog" is probably a cheaper and more approachable option for the garage engineer. Hard to find out much about that or OpenDog in general. I've found videos and 3d printer files but nothing that I can read to understand what it can do and why I might want to build it. Or do I really have to watch a bunch of YouTube videos? I hate video. Have I missed the actual project page somehow?

https://github.com/XRobots/miniDogV2 The code's a bit of a mess -- James is clearly not a software engineer first. This is totally understandable, given that he does so many other things! When I first saw the code, I thought about doing a refactoring pass and making a pull request. It would be painful to test correctness without the hardware, and I don't want to make things worse, so I haven't.

Post by dekhn » Mon, May 04, 2020, 4:19 PM UTC

e-_pusher wrote: post #53

NathanKau wrote: post #41

Hey all, my group in Stanford Student Robotics made Pupper. Happy to answer any questions!

Awesome project Nathan, kudos to the team. I'd love to use the Stanford Pupper at some point for K-12 outreach efforts myself. I reviewed your power distribution board. I think it needs more safety features before it can safely be entrusted to the hands of K-12 kids. Couple of comments: - The battery input is unfused. I would HIGHLY recommend adding one. - I know you guys wrote in Github about how people should not p…

Post by cypresssoftware » Mon, May 04, 2020, 10:00 PM UTC

canada_dry wrote: post #51

NathanKau wrote: post #41

Hey all, my group in Stanford Student Robotics made Pupper. Happy to answer any questions!

Awesome project! I'd love to build one, except for sourcing the parts - esp. the carbon fibre (out-of-stock) bits! If your team sold it as a kit I'd be your first customer! Of course, you'd have to ship to Canada too. Q. Was there a price point you had to aim for in the development (i.e. under $1K)? And, if you were to double the price, what improvements would you make (e.g. even better servos)?

Post by TaylorAlexander » Tue, May 05, 2020, 1:13 AM UTC

jsjohnst wrote: post #74

TaylorAlexander wrote: post #49

Earlier quoted context omitted.

I've built several servo powered walking robots. Torque is a major concern, and obviously weight plays a part in how much torque is required. The recommended servos look to be $30 each, x12 means $360. If you spent $200 just on servos you'd have to settle for $16 servos. Probably less torque. That would mean that at full leg extension the robot might not be able to support itself. That would be an annoyance when tryi…

> You can definitely do something for cheaper If the 35kg is in fact needed (which I’m not prepared to debate, probably needed, but I can’t prove / disprove), you are exactly right. Yes, you could maybe save a couple dollars with cheaper servo brands, but honestly for a 35kg servo, you’re going to pay a decent amount for 12 of them.