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In lugnet.technic, Mark Tarrabain wrote:
> Brian H. Nielsen wrote:
> > While working with Mark's full adder design, the XOR gate in particular, I
> > found something which may be useful in some pneumatic constructions.
>
> Egad! Another madman joins the fray! ;)
>
> > In Mark's fulladder http://www.members.shaw.ca/markt1964/fulladder3.jpg
> > consider just the XOR gate (the 3 switches on the piston on the right). There
> > are actually 3 outputs from the XOR gate. The bottom switch outputs AND, the
> > middle switch outputs XOR, and the top switch would output NOR if it weren't
> > plugged up. These 3 functions are mutually exclusive and one and only 1 will
> > always be true. This can be used to retract pistons attached to the outputs
> > whose values are false.
> >
> > Setup just the XOR gate and connect each output to the expansion port of a
> > piston. Now, with the 3 pistons in compressed mode connect the 3 compression
> > ports all to the same T, forming a closed system on the compression ports. Now
> > when the XOR gate is pressurized one piston will be forced to expand and create
> > positive pressure in the other pistons compression ports causing them to
> > retract.
>
> Am I misunderstanding you or are you suggesting that the pressure
> created by the expansion of one piston would actually be sufficient to
> compress *TWO* others? Unless the pistons had no loads at all, I'm not
> sure if that would really work.
I think the idea here is that they are mutually exclusive - only one will be
expanded at any one time, so when a different one is expanded, it effectively
only has to retract one other - the one that was previously expanded.
ROSCO
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Message is in Reply To:
 | | Re: A better full adder!
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| (...) Egad! Another madman joins the fray! ;) (...) Am I misunderstanding you or are you suggesting that the pressure created by the expansion of one piston would actually be sufficient to compress *TWO* others? Unless the pistons had no loads at (...) (21 years ago, 1-Jul-03, to lugnet.technic, lugnet.robotics)
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