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Mounting Options

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Should I weld or screw the spring in place?

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Unread postAuthor: Esgaruith » Sun Dec 10, 2006 9:10 pm

Hi, I am new to the forums, but have been spudding a while. Anyway, I had this idea of using cast iron pipe for my pneumatic, mainly because the store that carries it, carries the extreme pressure (6000 PSI). I was wanting to use a ball valve with a 2" ball I.D. but ball valves take so long to open compared to burst discs. My idea was to drill a small hole in the end of the handle, and then either welding a loop on the pressure chamber, or putting a screw into it, then using a very high tension spring to open the valve quickly. :?
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Unread postAuthor: SpudStuff » Sun Dec 10, 2006 9:53 pm

That will work fine. It has been done many times.
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Unread postAuthor: Esgaruith » Sun Dec 10, 2006 10:51 pm

What, screwing it in, or welding it on? I am not thrilled about the idea of a screw shooting out with 5500 PSI behind it
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Unread postAuthor: noname » Sun Dec 10, 2006 11:20 pm

The screw wn't pop out with 5,500 psi (how the hell would you get pressure that frickin, high?!) behind it. The surface area is so small that only a fraction of that pressure, like 100 psi would launch it anywhere if it did pop out, which is almost impossible to have happen. The threads will hold it in very tightly. If there IS 100 psi shooting the screw out, it will go about 19 (random number, I think you know that already) inches because the flow the the "valve" that has just been made is about 1/4" max.
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Unread postAuthor: drac » Mon Dec 11, 2006 9:45 pm

Yikes! Don't try 5500 PSI in cast iron! That's asking for death, besides, unless you have an extremely long barrel, you're not gonna notice much speed benefits.

Keep the pressure low, it's safer and just as fun, for your safety.
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6K PSI

Unread postAuthor: Esgaruith » Mon Dec 11, 2006 11:39 pm

If you didn't read my earlier post, here is a repeat: The store near me only sells the extreme pressure cast iron pipe capable of sustaining 6000 PSI.
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Unread postAuthor: MisterSteve124 » Tue Dec 12, 2006 4:09 pm

Do you have a compressor that can pump up to 5500psi?
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Unread postAuthor: Esgaruith » Tue Dec 12, 2006 6:41 pm

I don't personally, but I can rent a scuba tank and fill it to 5500PSI for about $35 USD. The tank is about 1500 CI
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Unread postAuthor: boilingleadbath » Wed Dec 13, 2006 4:10 pm

I won't weld it on either, as that might weaken the metal or something... so I'd use a screw into a peice of plastic, and then epoxy the plastic to the metal.
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Unread postAuthor: drac » Wed Dec 13, 2006 9:21 pm

Ahh, me and my misreading. I thought that you meant extreme pressure as in pressure tanks. In that case you'll be fine, my bad. :oops:
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