Burf2000 Posted November 15, 2011 Posted November 15, 2011 Hey people I thought I would start a thread based on my current project to to track progress. I have always wanted to build a giant pneumatic walker, so I started building one this weekend. Started off having only 6 legs but for stability I have gone with 8. So far it can only raise itself from the floor. I hope people like it. Flickr Quote
DLuders Posted November 15, 2011 Posted November 15, 2011 Boy, you sure like to "think big"! It's taken over your Living Room, correct? Quote
Burf2000 Posted November 15, 2011 Author Posted November 15, 2011 Boy, you sure like to "think big"! It's taken over your Living Room, correct? I want it to carry my 4 month old son :) Quote
captainmib Posted November 15, 2011 Posted November 15, 2011 I want it to carry my 4 month old son :) lol, that's nice. I'm thinking Wild Wild West! Quote
Burf2000 Posted November 15, 2011 Author Posted November 15, 2011 lol, that's nice. I'm thinking Wild Wild West! I so want to watch that film, I have not seen it for ages, was it any good? Quote
timslegos Posted November 15, 2011 Posted November 15, 2011 Thats HUGE! I am really surprised that 1 xl motor and a pump could lift up that beast... tim Quote
Crtlego Posted November 15, 2011 Posted November 15, 2011 That is enormous!!! How will it move forward? Were just testing the pneumatics first before installing some turn tables? Thats HUGE! I am really surprised that 1 xl motor and a pump could lift up that beast... As am I.. I had trouble with an RC motor pumping the pnuematics that lifted my moc but this is much larger lol, that's nice. I'm thinking Wild Wild West! I so want to watch that film, I have not seen it for ages, was it any good? Hahahaha. I was thinking about the same movie. Its pretty funny, definitely worth watching!! Quote
Burf2000 Posted November 16, 2011 Author Posted November 16, 2011 The turntables are on each lego already and I have already started fitting the pistons for the moving of the legs however I ran out. Just waiting for a few more to turn up. I usually use the RC motors as pumps as they are really quick, however I found that the big hand pumps (being motorised) delivered more air randomly. They can however kill a xl motor Hopefully get another video up at the weekend Quote
allanp Posted November 16, 2011 Posted November 16, 2011 Could you have two hand pumps opposing each other. This way the springs should cancel each other out and whilst the motor would still technically be pumping one at any given time, you would get double the air flow. Quote
Burf2000 Posted November 17, 2011 Author Posted November 17, 2011 That would work, people also remove the springs :) Not sure I am willing to do that Quote
matias bendtsen Posted November 17, 2011 Posted November 17, 2011 Not sure I am willing to do that It is possible to remove the springs and put them back. Quote
Burf2000 Posted November 17, 2011 Author Posted November 17, 2011 Oh cool, ok I will have a go, thank you :) Quote
apemax Posted November 17, 2011 Posted November 17, 2011 That looks awesome. Can't wait to see it start walking. Well done. Quote
Santiago Ontanon Posted November 17, 2011 Posted November 17, 2011 That's pretty awesome! I've always liked walkers, and I've build some of them myself. But this one is enormous!! Please keep us up to date of the progress!! Quote
allanp Posted November 17, 2011 Posted November 17, 2011 That would work, people also remove the springs :) Not sure I am willing to do that If you have two facing each other you may not have to remove the springs as they tend to cancel each other out, mostly they do anyway. You will still get some resistence from them when they are facing eachother at an angle due to the movement of the crank. But this can also be emininated using linkages. Quote
Burf2000 Posted November 17, 2011 Author Posted November 17, 2011 If you have two facing each other you may not have to remove the springs as they tend to cancel each other out, mostly they do anyway. You will still get some resistence from them when they are facing eachother at an angle due to the movement of the crank. But this can also be emininated using linkages. I will give that a go at the weekend when I try to make it walk :) Quote
Alasdair Ryan Posted November 17, 2011 Posted November 17, 2011 Have you given it a test drive yet or will this be the first time it moves?. Quote
chorlton Posted November 18, 2011 Posted November 18, 2011 It is possible to remove the springs and put them back. Could you not use pneumatic arms as the pumps? Are they not exactly the same mechanism, just without the spring? Quote
matias bendtsen Posted November 18, 2011 Posted November 18, 2011 Could you not use pneumatic arms as the pumps? Are they not exactly the same mechanism, just without the spring? No, because when you stretch it makes a vacuum and when you compress it it blows the same amout of air out again. Quote
Burf2000 Posted November 20, 2011 Author Posted November 20, 2011 Small update. So I have added rams to each leg so that it can move forward and also wired up motors to switch the values. However its got a little heavy and so I need to improve the lift and balance a bit. Hope to do some of it tonight Quote
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