Subject:
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Re: pneumatic help
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Newsgroups:
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lugnet.technic
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Date:
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Mon, 23 Aug 2004 17:17:32 GMT
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Viewed:
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26381 times
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In lugnet.technic, Vineet Honkan wrote:
> Kevin-
>
> I am in the design phase of my crane (the Demag AC 500-1 SSL) and currently I am
> working on the control system for the pneumatics. Following Ross Crawford's
> idea, I came out with something like this:
>
> http://www.brickshelf.com/cgi-bin/gallery.cgi?f=92653
>
> I am trying to control four pneumatic pistons individually, and simultaneously
> having them controlled by one master switch. Would this setup work? Any help
> would be appreciated. Thanks.
Hi Vineet,
I'll see if I can help. Your desciption "control four pneumatic pistons
individually, and simultaneously having them controlled by one master switch"
does not seem to match the second diagram. The primary reason is that you have
four pistons, but you are not trying to control all four individually.
In fact you've logically only got two pistons because you've connected two
pistons together mechanically at the base, and pneumatically at the pressure
ports. By the mechanical and pneumatic combining, you've created one larger
piston with double the throw length.
You've got four switches to provide individual control of the two large
pistons, and one final master swtich, making a total of five switches to control
two pistons. Are any of these switches mechanically linked to each other?
I've looked at the picture a lot, and cannot discern what problem you are
trying to solve. I need a more detailed description of the problem.
A more detailed description of how your solution is supposed to work would
help a lot also.
Are you shooting for this?
Piston 1 expansion port gets pressure when the master switch says it gets
pressure, or when V1 says it gets pressure.
Piston 1 contraction port gets pressure when the master switch says it gets
pressure, or when V1 says it gets pressure.
Piston 2 expansion port gets pressure when the master switch says it gets
pressure, or when V2 says it gets pressure.
Piston 2 contract port gets pressure when the master switch says it gets
pressure, or when V2 says it gets pressure.
If so, then the isolation switches are also part of the master switch, right?
Have you built the above circuit to see if it does what you want?
I'm happy to help when I have enough info to work with. This looks like an
interesting problem.
Kevin
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Message is in Reply To:
 | | pneumatic help
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| Kevin- I am in the design phase of my crane (the Demag AC 500-1 SSL) and currently I am working on the control system for the pneumatics. Following Ross Crawford's idea, I came out with something like this: (URL) am trying to control four pneumatic (...) (20 years ago, 22-Aug-04, to lugnet.technic)
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