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My air cannon

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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My air cannon

Unread postAuthor: jsefcik » Thu Jul 21, 2011 12:47 am

4 inch pvc, chamber schrader valve filling
chamber is 14 inch
barrel is 36

1 inch orbit sprinkler valve modified

hopefully the website works




http://imageshack.us/photo/my-images/854/dscf8174.jpg/
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Unread postAuthor: jhalek90 » Thu Jul 21, 2011 12:52 am

looks like a decent first cannon, with the exception of a few important things.

The end cap and bell reducer are DWV (non pressure rated parts.)

The pressure gauge should be threaded through 2 layers of PVC, like your fill valve.

The chamber looks to be made from cell core PVC. Not pressure rated

EDIT: please don't double post.
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: jsefcik » Thu Jul 21, 2011 12:55 am

I know the primer job isnt the best, My Dad helped when i wasnt around so please bere with me

I thought my parts were good for pressure wise but, Thanks for letting me know.Ill take that into consideration next time


Edited by jrrdw, double posting.
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Unread postAuthor: jhalek90 » Thu Jul 21, 2011 1:15 am

Use the edit button instead of double posting. The admins will be after you if you don't.

Double posting is when you post two messages in a row, instead of using the edit button. Just in case you really did not know that.

Image
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jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Doctore » Thu Jul 21, 2011 7:35 am

Looks great!!! :D
But next time take care about DWV parts!!!
Any damage pictures???
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Unread postAuthor: mattyzip77 » Thu Jul 21, 2011 8:27 am

hey nice cannon for a first. looks almost exacly like my first, blue thunder, and I also used a bell reducer. I have had no problems yet up to 120 p s i, but thats me. keep your pressure low, and you should be fine. but always BE CAREFUL and BE AWARE!!!also, next time tap your blow gun right into the sprinkler valve for quicker opening time!! any questions??? pm me!!
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Last edited by mattyzip77 on Thu Jul 21, 2011 11:13 am, edited 1 time in total.
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Unread postAuthor: jsefcik » Thu Jul 21, 2011 11:10 am

@MAttzip, Really, so take off the hose? I was told it will not make a big difference unless i had technolgy to proove it.I'll take it off and see if i have a difference.

Im guessing just using a brass threaded nipple?

Also this is my first air cannon but i have my BIG BERTHA, and 3 small little ones but they are combustion
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Unread postAuthor: MrCrowley » Fri Jul 22, 2011 5:31 pm

Really, so take off the hose? I was told it will not make a big difference unless i had technolgy to proove it.I'll take it off and see if i have a difference.

Unless your hose is shorter than 6", it probably will make a noticeable difference. Your hose does seem quite long, so give it a go and see if you can tell the difference.

Im guessing just using a brass threaded nipple?


I also used a bell reducer. I have had no problems yet up to 120 p s i, but thats me. keep your pressure low, and you should be fine. but always BE CAREFUL and BE AWARE!

They do sell pressure rated bell reducers so you should ask the member if theirs is pressure rated before telling them it's unsafe.

jsefcik,

Have you checked to see if all your pipe and fittings have "NSF-PW" printed on them?
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Unread postAuthor: jsefcik » Fri Jul 22, 2011 5:47 pm

@Mr crowley I'm going to take off the hose period, =) just checked and it does say nsf on them,I was reading the wrong side
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Last edited by jsefcik on Sat Jul 23, 2011 6:55 pm, edited 1 time in total.

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Unread postAuthor: MrCrowley » Fri Jul 22, 2011 5:49 pm

jsefcik wrote:@Mr crowley I'm going to take off the hose period, =) just checked and it doesn't say nsf on them,

Hmm sounds like they are probably not pressure rated. Personally, I wouldn't use them much above 60PSI.

This may help in the future:
http://www.spudfiles.com/spud_wiki/inde ... sure_rated
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Unread postAuthor: bignmeaty » Fri Jul 22, 2011 7:29 pm

Typically in America, most fittings sold 2" inch and smaller at Loews and Home Depot are NSF PW and anything bigger is DWV from my experience.. I wouldnt worry about the bell reducer, it looks pretty meaty and glued properly.
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Unread postAuthor: MrCrowley » Fri Jul 22, 2011 7:41 pm

I wouldnt worry about the bell reducer, it looks pretty meaty and glued properly.

The trouble is non-pressure rated fittings have short socket depths and are prone to literally flying off the joint even when glued properly. It's difficult to tell from the picture but it looks like the bushing that is glued in to the front, smaller diameter, part of the bell reducer has very little socket depth. Common sign of a non-rated fitting.[/quote]
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Unread postAuthor: jsefcik » Sat Jul 23, 2011 12:06 am

well ive taken it to about 120 psi with no problems
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Unread postAuthor: mattyzip77 » Sat Jul 23, 2011 12:17 am

120 with the broken air gauge???? just curious??? lol. watch out for them cliffs tomm........... 8)
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Unread postAuthor: jsefcik » Sat Jul 23, 2011 12:27 am

no, its kinda broken, still works but the inner wall with the numbers on it is bent, works but i have to tap it to get past 80, Im just going to replace it
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