Subject:
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Re: pneumatic cylinder: why not hydraulic ??
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Newsgroups:
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lugnet.technic
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Date:
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Wed, 14 Jul 2004 19:11:08 GMT
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Viewed:
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4296 times
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In lugnet.technic, Kevin L. Clague wrote:
> In lugnet.technic, Mark Bellis wrote:
> > One key thing about hydraulics has always been "avoid leaks". To switch the
> > fluid, just invent something I've wished for for years - the reverser switch.
> > This switch has four ports, used in opposing pairs. Clockwise in a circle they
> > would be A, C, B, D. In the middle position all ports are blocked. Pushed one
> > way and A-C and B-D are connected. Push the other way and A-D and B-C are
> > connected. The equivalent is to use four switches, with ports A to D being the
> > middle ports of each switch. Connect the outer ports of the switches so that
> > you get a crossover of the pipes without any leakage to the atmosphere in any
> > position, whilst moving all four switch levers together. With ports on a switch
> > being L, M and R, connect 1L to 3L, 1R to 4R, 2L to 4L and 2R to 3R. Connect
> > the inputs to 1M and 2M and a cylinder to 3M and 4M.
>
> > Mark Bellis
>
> Hi Mark,
>
> Is the cheapo ASCII art diagram below what you are talking about? We are
> viewing the switches/circuit from above. What is not shown is that the handles
> are all linked together.
>
>
> +-----+ +-----+
> +-----+ +-----+
> | | \ / | |
> | \ / |
> | \ / |
> | \/ |
> | / \ |
> | / \ |
> | | / \ | |
> +-----+ +-----+
> +-----+ +-----+
>
> Kevin
The basic rule is that all tubes connecting two switch side ports must go to the
same port on the two switches, to avoid leaks. You can see in your diagram that
the diagonal connections don't do that, so they will leak.
In a line, this is the arrangement:
+--A--+ +--B--+ +--C--+ +--D--+
.| | | | | | | | | | | |
.1 2 3 1 2 3 1 2 3 1 2 3
Folded back, the arrangement is this:
.1 2 3 1 2 3
.| | | | | |
+--A--+ +--C--+
OOOOOOOOOOOOOOOOO <- studless beam in the middle
+--B--+ +--D--+
.| | | | | |
.1 2 3 1 2 3
In each case, all four switches move together in the same direction left and
right.
Connect A1 to C1.
Connect A3 to D3.
Connect B1 to D1.
Connect B3 to C3.
Connect the input to A2 and B2 (from ports 1 and 3 of a single switch).
Connect the output cylinder to C2 and D2.
Use the holes in the beam between the switch fixing holes to put the B-C and A-D
tubes through, to keep it tidy.
You can chain these reversers together if you need to.
Mark
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Message is in Reply To:
 | | Re: pneumatic cylinder: why not hydraulic ??
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| (...) Hi Mark, Is the cheapo ASCII art diagram below what you are talking about? We are viewing the switches/circuit from above. What is not shown is that the handles are all linked together. +-----+ +-----+ +-----+ +-----+ | | \ / | | | \ / | | \ / (...) (20 years ago, 11-Jul-04, to lugnet.technic)
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