Subject:
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Re: Pneumatics and the RCX -how?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 21 Oct 1999 20:54:51 GMT
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Original-From:
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Doug Carlson <dcarlson@net/NoMoreSpam/-info.com>
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Viewed:
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444 times
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I'd love to get a hold of some small RCX controllable valves also.
I just finnished building a six legged pneumatic walker that would
benefit from these for different walking motions.
Presently, it just walks forward with the tripod gate type motion.
It uses 20 of the small pneumatic cylinders (three per leg) with two inside
the body to
flip the air switches and has the Cybermaster rubber tipped thingies for
feet.
There are a few pictures and a short MPG movie at :
http://www.net-info.com/~dcarlson/pnwalker.htm
(just a temporary location for now, I'll add this to my main page listed in
my sig soon)
I hooked it up to a different compressed air source (@ 30 psi) for the
movie so i could capture more gate cycles.
With a LEGO compressor and three air tanks it just takes a couple steps
(quickly) and then waits for the pressure
to build up again. It takes almost 30 psi to flip the switches when using
the small cylinders to actuate them. This is actually a benefit because it
enables the pneumatic cylinders driving the legs to move before the gate
switches flip to the next state.
Doug
At 11:53 AM 10/21/99 +0000, you wrote:
>
> I have been searching for the answer to this one for a while. My intent is
> to find a supplier who has small electrically operated (solenoid) valves • which
> can be driven by the RCX output(s).
>
> I have found one so far, but the valves are very pricy. But I haven't given
> up!
>
> I do intend to find an alternative to driving the lego valves using a motor.
> That is simply a waste of energy. I have built lead screws around 10/32 nylon
> studding which convert motor output into linear motion, much like the drive
> from a pneumatic cylinder. They are hugely powerful and demolish designs • which
> fail to provide adequate limit switches! But there is something very
> charismatic
> about robot designs which use pneumatic parts, and thus my quest!
>
> If I am successful, I assure you, I will publish!
>
> JB
Doug Carlson
dcarlson@net-info.com
http://www.net-info.com/~dcarlson
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Message has 5 Replies:
 | | RE: Pneumatics and the RCX -how?
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| (...) if the number of mini-cylinders could be reduced by 10 by only using 1 on each leg (use 1/2 beams for bracing outside the cylinder) and maybe using single cylinders and links for moving the legs? The basic design has a wonderful symmetry that (...) (25 years ago, 26-Oct-99, to lugnet.robotics)
| | | Re: Pneumatics and the RCX -how?
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| (...) Very nice construction!!! Could you post some pictures of your hand-held controller too? (Whatever is on the off-screen end of the tether seen in the video clip.) Is that just a battery box, or is there more to it? (...) I had some thoughts (...) (25 years ago, 26-Oct-99, to lugnet.robotics)
| | | RE: Pneumatics and the RCX -how?
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| There are other models of pneumatic LEGO hexapods on the web already that use linkage for the foward/reverse motion as well as a single large cylinder for each legs vertical motion. (2 URLs) a couple nice examples which inspired me to build this (...) (25 years ago, 26-Oct-99, to lugnet.robotics)
| | | Re: Pneumatics and the RCX -how?
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| (...) Thanks! The only things off screen are the battery box and compressor. If you look at the picture of the underside you can see the two switches and cylinders that control the stepping motion. (URL) is the LEGO compressor I use with it most of (...) (25 years ago, 26-Oct-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Pneumatics and the RCX -how?
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| I have been searching for the answer to this one for a while. My intent is to find a supplier who has small electrically operated (solenoid) valves which can be driven by the RCX output(s). I have found one so far, but the valves are very pricy. But (...) (25 years ago, 21-Oct-99, to lugnet.robotics)
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