Subject:
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Re: Pneumatic switching circuits
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 28 Jan 2005 02:44:02 GMT
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Viewed:
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2569 times
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In lugnet.technic, Joseph Greene wrote:
> Ok, I've look through mr Clagues site and I undertand the basics. But I have a
> problem in trying to design my pneumatic/switch circuit for this big nasty
> walker of mine:
>
> So fist a legend:
> _ = Extended
> ~ = retracted
> / = transition - retracting
> \ = transition - extending
> Each `Leg' is actually a set of legs
> Leg A Up/Down Cylinder = UDA
> Leg A Fore/Back Cylinder = FBA
> Leg B Up/Down Cylinder = UDB
> Leg B Fore/Back Cylinder = FBB
> Here's what I want to see:
>
> UDA /~\___
> FBA ~\__/~
> UDB ___/~\
> FBB ~\__/~
>
> Note: Positioning of cylinders on Leg A
> Forward Movment = Extending
> Backward Movement = Retracting
> Leg B is the rever Forward Movement is retracting.
>
> so here is the problem
> UDB Extension has to switch pressure to UDA Retract Port. no sweat..
> But After the FB Transition UDA has to Extend (While UDB is still extended )
> BEFORE UDB Retracts
>
>
> So I think I have a way to do this..but I'm running into walls...
I understand the above very well, but I do not understand the stuff below.
>
>
> ->---0----
> \ \
> SW SW
>
> ->---0---
> | \
> SW SW
>
> ->---0---
> / \
> SW SW
> ->---0---
> / |
> SW SW
>
> ->---0---
> / /
> SW SW
>
> and the revers would flip the switches in reverse order!
>
> Cool.. Anyone done this? Any ideas The mechanics of it are killing me.. and some
> of my LEGO.. I already busted 1 axle pin...
>
> there are alternatives.. but this one would look the smoothest.. in my opinion..
> There is of course the old - Break out the RCX and code it answer.. which is a
> possibility.. but I'm trying to do it all Pneumatic/Mechanical...
I admire you doing it all pneumatically.
I ended up having to have two pistons that were purely timing switches. There
were races in the circuit where things didn't stay pressured when needed, so the
two extra pistons/switches were race killers. I've used this circuit for
quad242, its succesor, and hex363, and phd.
Kevin
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Message has 1 Reply:
 | | Re: Pneumatic switching circuits
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| <SNIP> (...) OOPS.. I changed diagramming method to a physical ascii art diagram without clarifying it.. Below is 2 switches actuated by a slider which pushes first one switch handle (left switch) from far left to far right then when pushed past the (...) (20 years ago, 28-Jan-05, to lugnet.technic)
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Message is in Reply To:
| | Pneumatic switching circuits
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| Ok, I've look through mr Clagues site and I undertand the basics. But I have a problem in trying to design my pneumatic/switch circuit for this big nasty walker of mine: So fist a legend: _ = Extended ~ = retracted / = transition - retracting \ = (...) (20 years ago, 27-Jan-05, to lugnet.technic)
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