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In lugnet.technic, Kevin L. Clague wrote:
> In lugnet.technic, Mark Tarrabain wrote:
> > Oh yeah... it also requires rubber bands on the pistons to retract them
> > when there's no pressure, but since rubber bands are likc less than a
> > penny for half a dozen, I'm thinkin' that's probably not a serious problem.
>
> Nope they are an accepted part of the process.
While working with Mark's full adder design, the XOR gate in particular, I
found something which may be useful in some pneumatic constructions.
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.
Minimizing the length of tubing used to interconnect the compression ports
results in better compression strength. I have not tested to see how many
switches it can drive when being compressed like this, but it seems to have a
decent strength. This should work even stronger in setups with only 2 pistons
which are always being driven at opposite times.
Brian
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Message has 1 Reply:
 | | 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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Message is in Reply To:
| | Re: A better full adder!
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| (...) Very impressive! Two pistons! (...) Well, I can eliminate one switch on the Cin/A/NOT A piston. You don't need to throw the switches the full range do you? You can get the release from A/NOT A, and have to have it come from the local switches, (...) (21 years ago, 28-Jun-03, to lugnet.technic, lugnet.robotics)
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