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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Tue, 9 Aug 2005 20:17:40 GMT
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Viewed:
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3036 times
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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.
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.
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.
Mark
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Message has 1 Reply:
 | | Re: Classic timing circuits and XOR gates (long)
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| (...) Out of date reversors. Now my reversors are simply four switches in the same configuration as in XOR gates. (...) Good thing I don't use that design any more ;^) (...) Yes, you can make the engine run more or less efficiently which maps to (...) (19 years ago, 12-Aug-05, to lugnet.technic)
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Message is in Reply To:
| | Re: Classic timing circuits and XOR gates (long)
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| (...) (SNIP) (...) your diagram is particular to your overall circuit, right? (...) Absolutely..... I've found that a single can do the task, but only at maximum pressure. (...) Agreed... I had to add race killing by synchronizing leg up and down (...) (19 years ago, 9-Aug-05, to lugnet.technic)
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