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pneumatic circuts

A place to ask general spud cannon related questions.
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should this idea be used?

yes it has the potential to create new rapid sytems in spudguns
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no it's way to complicated, unreliable and expensive
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maybe only in very simple 1-2 stage systems
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maybe only in very simple 1-2 stage systems
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pneumatic circuts

Unread postAuthor: iknowmy3tables » Sun May 20, 2007 3:31 pm

as I think about more advance spud guns I think about ways to make spud guns preform certain task based on the flow of air, and pressurization of the chamber. I begin to think about these complex pneumatic circuits that use various relief valves, pistons, needle valves, and check valves connected to the chammber I heard such systems are used in pacemakers, and are similar to pneumatic computers.

hears an example: say I wanted a fully automatic gun with closed bolt. when the flow is opened to the actuator port of the piston the chamber begins to pressurize. at 30psi the first relief valve goes off and powers a piston that pushes the the locking bolt's action to open and return, at 70psi another relief valve goes off and power a piston that cuts off the piston from the chamber and exhaust it using a diverting valve and a return spring closes the bolt, at 100psi the last relief valve goes off and powers the piston valve's actuator which is probaly a diverter like the sleeve valve. so the gun fires and check valve leading twords the chamber exhaust the other smaller pistons to make them reset, and the whole thing stars over

this is pretty complicated so I'm wondering of this idea of using complicated pneumatic wiring should be avoided or abandon
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Unread postAuthor: sandman » Sun May 20, 2007 3:52 pm

um, maybe a picture would work better as explaining your theory.

i think i got it, but im not sure
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Unread postAuthor: iknowmy3tables » Sun May 20, 2007 4:17 pm

it doesn't matter if you don't understand my example, the whole thing is about relief valves that open at Xpsi, to power small systems on the pneumatic cannon such as a loading bolt or the valve

arrangement of the relief valves and pneumatically powerd systems is like programing the gun to do this and that at X pressure

p.s. I just realized that the first relief valve/ first stage doesn't need a relief valve
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Unread postAuthor: singularity » Sun May 20, 2007 5:43 pm

alright how are you going to find out what pressure the cannon is at electronically? do you have an electronic pressure gauge, if so please give me a link to it. i dont exactly understand what your concept, a diagram would really help. are you talking about some sort of elctronic loading firing system. like first bolt pushed ammo into chamber, second chamber pressure is cut off, third pilot valve is opened cannon is fired? is that what you talking about but like instead of having to do that manually a computer controlled sequence would do all of it. i am really good at electronics if you need any help with the actually circuit i could probably help.
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Unread postAuthor: iknowmy3tables » Sun May 20, 2007 6:21 pm

no it's 100% pneumatic the relief valves actuate only at a certain pressure, pop relief valve are sometimes build with threaded outputs and come in other pressures than 120psi
Image
you should have heard of pop-saftey relief valves, I just avoided saying that because people might think of the normal 120psi valve on their compressors that vents directly to the atmosphere only, and not about the the threaded output valves
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Unread postAuthor: boilingleadbath » Sun May 20, 2007 7:30 pm

Fully-automatic spudguns utilizing pneumatic circuits have been done. (I think it was Mr. Plow of spudtech - a.k.a. jacksmirkingrevenge)
...ok, <a href="http://www.spudfiles.com/spudtech_archive/viewtopic.php?t=11932">not quite</a>.

(he used some electronic switches)

But, certainly, no reason it <i>couldn't</i> be done... it's just that Mr.Plow felt electronic systems must have been better in some way.
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Unread postAuthor: iknowmy3tables » Sun May 20, 2007 8:11 pm

oh god :shock: you must tell me more, because I have been planing on a select fire belt fed and I was hoping to be the first, the video link doesn't work but I must know more!!
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