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How you reckon this will turn out ? (Will it work )

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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How you reckon this will turn out ? (Will it work )

Unread postAuthor: Stifler69 » Tue Dec 02, 2008 2:03 am

Ok well I've had this project sitting in my work shop for awhile and all my mates say it wont work but i though i should ask the masters (you).

All the dimensions are in the pictures as shown.

Will there be enough psi to shoot a Golf ball a fair distance ?
or what psi would i need to pump it up to ?

Cheers for all the help
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Attachments
P021208_17.15[01].JPG
Barrel for gold ball to be fired out of...
P021208_17.15.JPG
Barrel for gold ball to be fired out of...
P021208_17.14[01].JPG
Air Pressure chamber
P021208_17.14[01].JPG (35.1 KiB) Viewed 403 times
P021208_17.14.JPG
Air Pressure chamber
P021208_17.14.JPG (38.74 KiB) Viewed 403 times
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Unread postAuthor: starman » Tue Dec 02, 2008 2:17 am

You seem to have enough chamber space and barrel length to have some decent fun with...it's going to be a little heavy I think. You don't describe how you intend to vent the chamber into the barrel....ie. valve, and seal the chamber.

Uummm all metal...pressure wise, practically, your quick connects and whatever valve you use will be your limiting factor.
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Unread postAuthor: MrCrowley » Tue Dec 02, 2008 2:26 am

Hmm with a 2" piston valve and a couple hundred PSI, that golfball will really fly.

Though that's require making a very strong piston valve. A ball valve could work decently if you had a longer barrel.
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Unread postAuthor: Stifler69 » Tue Dec 02, 2008 2:31 am

The weight doesnt bother me at all, i really wanted it to be heavy...ish

I was planning on putting a sprinkler valve in but if i want to get this thing up to higher pressures then that probably is the best thing to use.....Do you have any ideas ???


MERGED: Please don't double post. Edit your posts instead

Ahhh thanks MrCrowley !, Im not really sure where to start in making a strong piston valve... and i know everyone will just say look them up but is there an easy or simple diagram or way to make one.
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Unread postAuthor: MrCrowley » Tue Dec 02, 2008 2:45 am

Stifler69 wrote:Ahhh thanks MrCrowley !, Im not really sure where to start in making a strong piston valve... and i know everyone will just say look them up but is there an easy or simple diagram or way to make one.
This might help:
http://www.instructables.com/id/Golfbal ... That-Shoo/
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Unread postAuthor: ALIHISGREAT » Tue Dec 02, 2008 2:45 am

square tubing doesn't have very good pressure rating compared to round tubing.
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Unread postAuthor: Stifler69 » Tue Dec 02, 2008 2:52 am

Thanks MrCrowley
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Unread postAuthor: Hydra » Tue Dec 02, 2008 3:21 am

Ahhh thanks MrCrowley !, Im not really sure where to start in making a strong piston valve... and i know everyone will just say look them up but is there an easy or simple diagram or way to make one.

This thing is great
http://www.spudfiles.com/forums/piston- ... t8157.html
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Unread postAuthor: Ragnarok » Tue Dec 02, 2008 5:20 am

No. Just No. Seriously. Don't even THINK about using square tubing for holding pressure.
It's not safe at all - no matter what pressure you use, forces get concentrated around the corners, and they WILL tear it apart.

The most dramatic failure of any pressure vessel I have ever seen wasn't so far as being square, but it was getting that way.
I was parallel testing it against a cylindrical vessel. It went at half the pressure of the cylinder - and had walls literally 10 times thicker.

I tried the same thing again at half the pressure - after a dozen or so cycles - it went from the repeated strains.

Pure "square", like your chamber, will be even worse - and in your case, it will be exacerbated again by the sides of different lengths.

It might not go the first time, but if you use any pressure worth using, it WILL go, and it will go VERY badly.
Metal or not, I wouldn't stand within 30 feet of that when it was pressurized, and I'd only be that close if I was in full riot armour.

In case I have not made it absolutely clear, do not even think about using square pressure chambers. Not even close to being worth the risk.
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Unread postAuthor: jackssmirkingrevenge » Tue Dec 02, 2008 5:45 am

gold ball


Throwing money away eh :D
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Unread postAuthor: CasinoVanart » Tue Dec 02, 2008 6:53 am

jackssmirkingrevenge wrote:
gold ball


Throwing money away eh :D


meh, as long as he throws it my way....
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Unread postAuthor: FishBoy » Tue Dec 02, 2008 7:06 am

Ragnarok wrote:No. Just No. Seriously. Don't even THINK about using square tubing for holding pressure.
It's not safe at all - no matter what pressure you use, forces get concentrated around the corners, and they WILL tear it apart.

The most dramatic failure of any pressure vessel I have ever seen wasn't so far as being square, but it was getting that way.
I was parallel testing it against a cylindrical vessel. It went at half the pressure of the cylinder - and had walls literally 10 times thicker.

I tried the same thing again at half the pressure - after a dozen or so cycles - it went from the repeated strains.

Pure "square", like your chamber, will be even worse - and in your case, it will be exacerbated again by the sides of different lengths.

It might not go the first time, but if you use any pressure worth using, it WILL go, and it will go VERY badly.
Metal or not, I wouldn't stand within 30 feet of that when it was pressurized, and I'd only be that close if I was in full riot armour.

In case I have not made it absolutely clear, do not even think about using square pressure chambers. Not even close to being worth the risk.


I'm with Rag on this one, just go to home depot and get some galvanized steel pipe or something.
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