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Rob Stehlik wrote:
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?m=derek
>
> Wow, Derek, nice walkers! I love pneumatics. I gotta build me a pneumatic
> walker someday... Need more small cylinders... Should order them from the
> UK... What did you use as your compressor? Do your walkers turn? Also, about
> the monkey thing, if you can build such classy walkers, surely you can build
> a monkey! Keep at it! I want to see as many monkeys as possible!
> Rob
Thanks, its fun building pneumatic walkers. I was inspired to build them based
on a walker website I read that said it was impractical to build walkers with
pneumatics. Can't remember the site now.
So far my walkers have only been able to walk in a straight line. Once I'd
finished version 3.5 I developed some ideas on how to make it steer, but I
haven't been inspired enough to start version 4.0.
The one thing I'm very happy about is that they are autonomous, so the
compressor and batteries are all on board.
Version 1 uses two compressor cylinders, and just used a delay timer in the RCX
to know when it had enough pressure to take a step.
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=62551
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=62552
They aren't very good pictures of the compressor. The problem with this design
was the 16 tooth gears took a lot of abuse from the backlash of the cylinders
passing from compression to the return stroke and back. There was a trail of
fine gray power left on the ground as this one walked by.
Version 3.5 uses four compressor cylinders, and a pressure sensor arrangement
to know when it could take a step.
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=62612
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=62620
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=62624
Again not very good pictures of the compressor. In this case I used belts to
drive the compressor cylinders, this way the backlash was taken up by the belt
and no gears where harmed.
Here is the pressure sensor:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=62629
Unfortunately yet another not very good picture. Under the plate at the head
of the cylinder is two small shock absorber/springs and a touch sensor. The
springs push against the cylinder's extension. When the pressure was high
enough the cylinder would compress the springs to the point it hit the touch
sensor.
Incase you are wondering Versions 2 and 3.0 where such spectacular failures it
wasn't even worth taking pictures of them. Although the main body design of
3.0 made it into 3.5.
One day I'll build another one, I would like to make one that can turn, and
walk over uneven ground.
As for the monkey I'll definitely keep trying. The problem is, like with the
walkers, I tend to go for the overly complicated solution. What I really need
now is a test course. Hopefully I can talk my dad into building me a short one
this weekend.
Derek
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Message has 1 Reply:
 | | Re: T-Shirt
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| (...) TEST COURSE!! ARGHHH for the test course, all you need is 2 rungs. at least to figure out the basics. go to canadian tire or some such and get a few bits of copper pie or dowel. the in time once you have the basics works out you can build a (...) (23 years ago, 24-Aug-01, to lugnet.org.ca.rtltoronto)
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Message is in Reply To:
| | Re: T-Shirt
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| (...) walker someday... Need more small cylinders... Should order them from the UK... What did you use as your compressor? Do your walkers turn? Also, about the monkey thing, if you can build such classy walkers, surely you can build a monkey! Keep (...) (23 years ago, 24-Aug-01, to lugnet.org.ca.rtltoronto)
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