Subject:
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Re: pneumatic cylinder: why not hydraulic ??
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 8 Apr 2004 21:56:34 GMT
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Viewed:
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3023 times
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In lugnet.technic, Mark Bellis wrote:
> I get the impression you've complicated things by putting different switches at
> different lever angles. My reverser idea puts the switch lever pivots 16mm
> apart, all in a line with 2-beams between: BSBSBSBSB along a beam of length 17
> holes, so an 8-beam and a 10-beam with plates above and below should suffice.
> The levers have toggle joints on top, with a 14-beam connecting them. This beam
> can be pushed by 2 cylinders if required. All the switches move together over
> their full movement range.
I'd love to see a picture of your reversor, as verbal explanations by themselves
are often much harder to comprehend.
>
> This reverser deliberately sends air from the unpowered side of the cylinder
> back to the unpowered input hose, with no leaks to the atmosphere. It is just
> as important to release air correctly as it is to not release it incorrectly!
> These reversers can be daisy-chained and so a single switch can provide the
> first stage of reversal, forming an exclusive OR gate. This is useful because
> the single switch can be mounted on the end of a robot arm, whereas the 4
> switches are too heavy and need to be on the base. On my pick and place robot
> they sit on the base, pushed by cylinders in parallel with the grab, so they
> form a counterweight. The grab is an easier load, so it always moves first.
Again, I'd like to see this. My pneumatic mux that can act as a polarity
reversor, can just as easily be used for an XOR gate with one piston and four
switches.
Are you claiming you can do XOR with one switch and one piston? If this is
true, you've got my attention. Single phase or double (i.e. do you have outputs
from the gate to both expand *and* contract the next piston?)
I'm very curious about your reversors. LEGO pneumatics are a very strong
interest of mine.
>
> Of course the new switches can be closer together, so only a 12 beam is required
> for 10 holes, and 1 14-beam for 12 holes to mount the switches.
>
> The only place I've used offsets between switch lever angles is in pneumatic
> steering, when I want to get cylinders to stop half way. My other gates have
> the switch levers all at the same angle, 'cos you know that all switches will
> block or pass air at the same time.
Again, I'd love to see pictures of reversor, AND, OR and XOR gates. I'm always
interested in alternate solutions, better, worse or the same.
I can perform AND/XOR with one piston and seven switches. Mark Terabain can do
full adder much better than I can. I have not taken the time yet to figure out
how his design works, but I can testify that it indeed does.
>
> Mark
Kevin
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Message has 1 Reply:
 | | Re: pneumatic cylinder: why not hydraulic ??
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| (...) A XOR gate has two inputs, one with 1 switch and one with 4 switches. The 4-switch one is a standard reverser and the 1-switch one has the air supply on the middle and the two outer ports go to the input ports of the reverser (the middles of (...) (20 years ago, 10-Apr-04, to lugnet.technic)
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Message is in Reply To:
| | Re: pneumatic cylinder: why not hydraulic ??
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| (...) I get the impression you've complicated things by putting different switches at different lever angles. My reverser idea puts the switch lever pivots 16mm apart, all in a line with 2-beams between: BSBSBSBSB along a beam of length 17 holes, so (...) (20 years ago, 8-Apr-04, to lugnet.technic)
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