Subject:
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Re: Questions from a pneumatics newbie.
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Newsgroups:
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lugnet.technic
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Date:
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Tue, 10 Jun 2003 21:28:01 GMT
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Viewed:
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884 times
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In lugnet.technic, Mark Tarrabain wrote:
> Kevin L. Clague wrote:
>
> > This set includes 10 large pistons and two large pumps, as well as new form
> > factor swtiches.
> >
> > The pistons are also a new form factor, one that no longer makes it easy to butt
> > two pistons together. Might not be what you want if you are into pneumatic
> > computing.
> >
> > Kevin
>
> This shouldn't be a problem for me. I've come up with my own design for
> pneumatic logic gates (without using negative pressure even!) where each
> piston is attached to the handle of one or more switches very much like
> in your Synchropillar design where the base of the piston just attaches
> to a liftarm or beam that pivots. The beauty of this arrangement is
> that it won't require any rubber bands and I will be able to position
> the pistons wherever it's convenient for the model, rather than always
> requiring them to be end-to-end. And multiple inputs to the same gate
> do not have to adjacent. What I've got drawn here so far is a design
> that uses the position of 2 cylinders as inputs and requires 3 switches.
If you have a scanner or digital camera, you could upload your drawings to
brickshelf.
> By changing how the pneumatic tubing is wired between the switches,
> any 2-input combinational logical output and its complement can be
> produced as output, so the fundamental design is highly reusable. My
> design uses positive air pressure as a logical 1, and exhaust as a
> logical 0. I don't know this for sure yet, since I don't have the
> components to play with, but I suspect that the design I have may
> require a heavy duty air supply... probably moreso than your pneumatic
> logic.
Hmmm.... If a zero is pressure release, how will the piston contract with no
rubber bands? If the piston doesn't contract then the switch posistion won't
change.
>
> I'd really like do up what I've done in Ldraw to show what I mean, but I
> have no pneumatic Ldraw parts, and I'm not sure how I'd do the tubing
> anyways.
I use the pneumatic LDraw parts created by JP Brown.
You can get them here:
http://www.users.qwest.net/~kclague/pneumaped/index.htm
Read down near the bottom of the page.
To create the tubes you can use a program called LSynth that I wrote. YOu can
get it at http://www.users.qwest.net.
>
> I'll be seeing if I can draw up a mux, and demux on paper later this
> afternoon. After that, I'm going to see if I can do some sequential
> logic. Wow... I'm having so much fun with this, it should be illegal. :)
Muxes are easy without pistons. Demuxes are much harder if you want the
non-decoded outputs to be forced to zero. If floating is OK, then they are
easy.
I'm very interested in how you'll do your sequential logic. I have a scheme for
doing that.
Nice to have another computer hardware person motivated. I look forward to
seeing your designs.
>
> BTW, how much is that set?
$120 US.
>
> > > Mark
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Message has 1 Reply:
 | | Re: Questions from a pneumatics newbie.
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| (...) The premise would be that I would actually be supplying inputs to both ends of a destination piston. Since my gates produce *BOTH* the required combinational logic output and its complement on two separate valves, I just hook both airflow (...) (21 years ago, 10-Jun-03, to lugnet.technic)
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Message is in Reply To:
| | Re: Questions from a pneumatics newbie.
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| (...) This shouldn't be a problem for me. I've come up with my own design for pneumatic logic gates (without using negative pressure even!) where each piston is attached to the handle of one or more switches very much like in your Synchropillar (...) (21 years ago, 10-Jun-03, to lugnet.technic)
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