Subject:
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Pneumatic switching circuits
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 27 Jan 2005 21:47:47 GMT
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Highlighted:
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(details)
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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
\ = 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...
->---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...
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Message has 2 Replies:
 | | Re: Pneumatic switching circuits
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| (...) This is something mr Clague did tackle on his page. In his Quad242 ( (URL) ), he did just what you're wanting to do. In fact, if you can decrypt this page: (URL) you'll understand the secret. I believe the key is having "and" gates, where two (...) (20 years ago, 27-Jan-05, to lugnet.technic)
| | | Re: Pneumatic switching circuits
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| (...) I understand the above very well, but I do not understand the stuff below. (...) 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 (...) (20 years ago, 28-Jan-05, to lugnet.technic)
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