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Simple, Nifty Walker — Parallax Forums

Simple, Nifty Walker

ercoerco Posts: 20,256
edited 2010-04-05 03:52 in Robotics
Looks like a 2-motor robot. Nice job by the builder, let's find him!
http://www.youtube.com/watch?v=_6qpSOjtB2E&NR

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·"If you build it, they will come."

Comments

  • Roy ElthamRoy Eltham Posts: 3,000
    edited 2010-01-20 21:25
    Here's his website: http://jamius.com/

    His videos of making the giant version of that robot are hilarious.

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  • ercoerco Posts: 20,256
    edited 2010-01-20 21:53
    Thanks for that link, Roy. Great video blog. It just gets better & better.

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    ·"If you build it, they will come."
  • iDaveiDave Posts: 252
    edited 2010-01-21 00:01
    Ha! This guy seems pretty interesting. Here's a quick link to those funny videos:jamius.com/Robot/Robot.html

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    "A complex design is the sign of an inferior designer."
  • FranklinFranklin Posts: 4,747
    edited 2010-01-21 02:57
    And his youtube channel www.youtube.com/user/JMEMantzel

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    - Stephen
  • iDaveiDave Posts: 252
    edited 2010-01-21 03:11
    Also, anyone interested in a simple hexapod walker should check at this video over at Pololu. Has a nice slow motion view of the servo actions.



    www.pololu.com/docs/0J42/all

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    "A complex design is the sign of an inferior designer."
  • HumanoidoHumanoido Posts: 5,770
    edited 2010-01-22 16:21
    The walking robot dog and the robotic slug are the best entries!

    humanoido
  • Beau SchwabeBeau Schwabe Posts: 6,566
    edited 2010-01-22 20:24
    This guy is Funny...

    Check out the leg build of the Gigantic Spider Robot he's working on...

    www.youtube.com/user/JMEMantzel#p/a/u/1/aMU3Q7n33HY




    Edit:

    If you've ever questioned your own ingenuity as far as how on earth you were going to get from point A to point B, I urge you to watch this guy's videos. Truly inspirational original solutions to very complex problems, and this guy just seems to do it and get the job done.

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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.

    Post Edited (Beau Schwabe (Parallax)) : 1/29/2010 5:00:37 PM GMT
  • Martin_HMartin_H Posts: 4,051
    edited 2010-01-23 03:35
    I understand hexapod gates, but what mystifies me about this robot is how it turns. The top portion turns and that shifts the direction the legs walk in. I don't quite see how that works mechanically.
  • LawsonLawson Posts: 870
    edited 2010-01-25 18:49
    Martin_H said...
    I understand hexapod gates, but what mystifies me about this robot is how it turns. The top portion turns and that shifts the direction the legs walk in. I don't quite see how that works mechanically.

    My guess is that the gait pattern generator is in the rotating head. The exact details of how this is done I can't see either. I'd LOVE to see some close up pictures of that walkers guts.

    Lawson

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  • Roy ElthamRoy Eltham Posts: 3,000
    edited 2010-01-26 00:46
    I believe I have figured out how it works using my legos. I managed to build a very flimsy unstable (because lego gearing and rods have a lot of give/play) model out of lego that I can manually operate the inner part to produce the same gait and also change the gait direction by changing the orientation of the inner bit. I spent all of Friday night (until 5am) and most of Saturday trying all sorts of variations until I sorted it out. I watched his video of it over and over, and also he has one hires photo of it on his website that lets you see some of the mechanical stuff better. Also, on his website is a video of another earlier version of the 6 leg robot made of metal "wire frame" and you can see a little bit more of how it's working.

    In case you didn't know, it's all done with just 2 motors. One drives the motion of all 6 legs, and the other turns the top bit around including turning the other motor around along with it's connected gears and what not. If you number the legs 1-6, then the top part of the even legs and the bottom part of the odd legs are all connected to a center rod. That rod moves in a up->forward->down->back circular motion. Due to the linkage of the legs to the chassis the circular motion causes it to walk with a gait where 3 legs are on the ground and pushing it forward while the other 3 legs are lifted up and moving forward. If you take that center rod and the mechanism driving it and rotate it around, that changes the direction the thing walks in.

    If I had a cnc machine I am pretty sure I could make a working bot.

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  • ercoerco Posts: 20,256
    edited 2010-01-26 00:51
    Roy:

    I agree. It's most likely a two-motor setup where one motor does all the leg driving through eccentric linkages or cams, and the other simply rotates the whole drive mechanism relative to the base & legs. It's very well done.

    Along the lines of how the Toddler/Penguin manage a variety of gaits and turns with 2 servos by changing the phasing of the motions.

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    ·"If you build it, they will come."
  • Beau SchwabeBeau Schwabe Posts: 6,566
    edited 2010-01-26 03:14
    In the giant robot video's he talks about using only one motor for the legs, and then having the "operator" (person) steering with a bus-wheel <-- I think that's what they are called, they are about 6-8 inches in diameter with a handle that allows you to spin it quickly. As you rotate the bus-wheel several times around it rotates the entire head of the robot with you in it slowly through gear reduction. He mentions this as a method to save power if the person can do it it's one less thing to worry about.

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    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.
  • Roy ElthamRoy Eltham Posts: 3,000
    edited 2010-01-26 07:26
    Yeah the Giant Robot Project videos helped me understand a little also. Those things are great fun to watch. I've watch them all through 39, and I am working my way through his other videos. The guy does anything and everything to accomplish his tasks. Like making a dirt road up to his place so he can truck in larger loads of stuff like the banana building! [noparse]:)[/noparse]

    He also went off to Alaska for 8-9 days and helped a friend build a most of a log cabin. It's crazy how productive he is. I wish I was 1/4 as productive.

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  • FranklinFranklin Posts: 4,747
    edited 2010-04-04 16:26
    New video of Jamie's (?) bots www.youtube.com/watch?v=vP-dOp7mPMU&playnext_from=TL&videos=IPBLnFWAJOc&feature=grec

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  • ercoerco Posts: 20,256
    edited 2010-04-04 18:29
    That boy has got some good robot stuff going on. And he's quite a character if you watch his many videos. I see him as the "Kramer" (Seinfeld reference) of Robotics.

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    ·"If you build it, they will come."
  • Martin_HMartin_H Posts: 4,051
    edited 2010-04-04 22:45
    I can't wait to see the video where he finally gets the giant spider robot walking!· You have to wonder what he's going to do with it.
  • P!-RoP!-Ro Posts: 1,189
    edited 2010-04-05 03:52
    Wonder what he'd make if we donated an msr1 [noparse]:)[/noparse]

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