Subject:
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Re: Classic timing circuits and XOR gates (long)
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Newsgroups:
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lugnet.technic
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Date:
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Fri, 12 Aug 2005 02:41:02 GMT
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Viewed:
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3358 times
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In lugnet.technic, Mark Bellis wrote:
> In lugnet.technic, Kevin L. Clague wrote:
> > In lugnet.technic, Mark Bellis wrote:
> > > In lugnet.technic, Kevin L. Clague wrote:
> >
> > (SNIP)
> >
> >
> > > Can I suggest that in order to avoid leaks (very important in walking robots!)
> > > you use the full XOR gate from my diagram:
> > > http://www.brickshelf.com/gallery/mbellis/Technic/Pneumatics/PnP-Robot/pnp_robot_circuit.jpg
> >
> > I've never had leak problems with a four switch XOR gate. The fifth gate in
> > your diagram is particular to your overall circuit, right?
>
> Yes, four switches in one bank (grab) and one in the other bank (wrist) make the
> XOR gate.
>
> (SNIP)
> > You can reverse the engine rotation using polarity reversors as I did here:
> >
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=414995
> >
> > Or with a differential as I did here:
> >
> > http://www.brickshelf.com/cgi-bin/gallery.cgi?i=559884
> >
> > Or with linkages as used in regular steam engines.
>
> I have the double reverser scheme in my shuttle circuit at the moment. I didn't
> see the need for finer phase adjustment yet, since the shuttle device will be
> either moving or stationary and will be designed to be aligned only to multiples
> of 90 degrees.
>
> You have odd extra switches in your reversers. I would use only four in each,
> wired like the top 4 grab ones in my P+P robot because the timing is designed to
> have a wide margin. A reverser is just the larger half of an XOR gate.
Out of date reversors. Now my reversors are simply four switches in the same
configuration as in XOR gates.
>
> I don't like the look of all those unused ports - looks like a lot of sources of
> leaks, especially with odd-angled levers! All my switches are moved together in
> logic designs, and all are at the same angle as each other, without any gain in
> lever mechanisms. The only model where I've bent the rules is pneumatic
> steering, getting cylinders to stop in the middle.
Good thing I don't use that design any more ;^)
>
> The diff scheme looks like it could take out some complexity - always a good
> thing. Better to get a cylinder to turn that by 90 degrees (gain of 2:1 gives
> 180 degree phase shift) in order to reverse the sequence. Something I can
> experiment with.
>
> Can you get any acceleration with your change of phase, like a real steam
> engine? It starts with lots of valve movement and gradually reduces the
> movement as speed increases, by reducing the reversing gear.
Yes, you can make the engine run more or less efficiently which maps to slower
or faster, depending on phase resolution lower than 90 degrees.
>
> Mark
Kevin
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Classic timing circuits and XOR gates (long)
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| (...) Yes, four switches in one bank (grab) and one in the other bank (wrist) make the XOR gate. (SNIP) (...) I have the double reverser scheme in my shuttle circuit at the moment. I didn't see the need for finer phase adjustment yet, since the (...) (19 years ago, 9-Aug-05, to lugnet.technic)
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