Subject:
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Re: New technique: Cascaded Trinary Pneumatics (aka mid-stop)
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Newsgroups:
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lugnet.technic, lugnet.robotics
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Date:
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Mon, 3 Oct 2005 19:00:33 GMT
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Viewed:
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363 times
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In lugnet.technic, Mark Bellis wrote:
<snip>
>
> I have succeeded in directly cascading trinary pneumatic stages (where cylinders
> stop in the middle).
>
> This is a direct development of my mid-stop pneumatic JCB steering mechanism,
> which I first described here two years ago:
> http://news.lugnet.com/org/us/lugola/?n=916 (second paragraph from the bottom).
Hmmmm..... this paragraqph mentions two pistons and three switches....
>
> I've taken some photos and will post them as soon as they come back from the
> developers. They will include the trinary system in all positions, as well as
> the Octopus Arm logic that I mentioned earlier. There will also be my earliest
> use of my trinary actuation mechanism and a pressure limiter (I'm sure quite a
> few people have their own versions of the latter).
I look forward to seeing them!
>
> I took the actuation stage and the steering stage from my earlier work and added
> a combination of the two in the middle to make two cascading stages.
>
> I hope this will be useful for your walkers Kev. It's different from the way
> you were doing it. I have used opposing pistons for more power, and also extra
> frame members in tension to improve strength.
More ways are better!
>
> The mechanism works quite well but I will keep improving it, probably by beefing
> up the power to improve reliability (with apologies to vegetarians :-) ). This
> might involve adding more cylinders to ensure that the mechanism reliably
> reaches its maximum distance from the centre position in both directions. The
> switch connections and the actuation mechanism that keeps the switch levers
> exactly the right distance apart are my own unique designs, which work well.
>
> I remember how it took quite a while to work out exactly how far apart the
> switch levers needed to be and which parts to use to achieve that distance.
>
> I wish my digital camera would arrive so that I could speed up posting!
Me too!
>
> Mark
Kev
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