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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Mon, 3 Oct 2005 21:29:14 GMT
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Viewed:
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4333 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:
> > > > In lugnet.technic, Mark Bellis 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 Out of date reversors.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.
>
> (SNIP)
> > >
> > > Mark
> >
> > Kevin
>
> Ah yes, like this
> http://www.brickshelf.com/gallery/mbellis/Technic/Pneumatics/Building-Blocks/4-switch_pneumatic_polarity_reverser.jpg
>
> Do you have any pictures of how you used the reversors? How successful have
> they been in your walkers?
Yes. I've used it in walkers to switch from forward walking to reverse walking,
and to switch from walking to turning and back. I move them by hand, rather
than with pistons. With pistons, I consider them XOR gates.
They work very well. Thanks for the tip.
>
> Mark
Kev
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