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Cannon Accumulator Help

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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Unread postAuthor: jackssmirkingrevenge » Sat Sep 17, 2011 5:45 am

What was wrong with using a QEV?
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Unread postAuthor: daniel0663 » Sat Sep 17, 2011 5:50 am

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Unread postAuthor: jazzman56 » Sat Sep 17, 2011 5:52 am

What pressure can a QEV take , would this one do:

http://www.ebay.com.au/itm/Pneumatic-3- ... 287wt_1139

Sorry but, i'm having a hard time on working out the dead space for my cannon:

What is the best way to fill and fire one of these, as a 3/4 tee (as bunnings don't have any smaller sizes) fitting on the back of this connected to a ball valve and shrader is a large amount of dead space.

How do i reduce this space


Thanks once again JSR and everyone else for contributing
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 17, 2011 6:32 am

jazzman56 wrote:What pressure can a QEV take , would this one do:

http://www.ebay.com.au/itm/Pneumatic-3- ... 287wt_1139


That one is going to take a bit more than 300 psi to blow it up.

Thanks once again JSR and everyone else for contributing



have a look through this thread: http://www.spudfiles.com/forums/my-firs ... 23319.html
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Unread postAuthor: jazzman56 » Mon Sep 26, 2011 6:13 am

Can i use this epoxypaint to coat the inside of the extinguisher to prevent rust?


http://www.itwpf.com.au/galmet/product.aspx?productid=22
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Unread postAuthor: Gippeto » Mon Sep 26, 2011 8:21 am

Is there some reason you cannot simply use :a piece of black iron pipe, an end cap, and a reducer?

2" pipe should get you to 500cc in a reasonable length.
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Unread postAuthor: Moonbogg » Mon Sep 26, 2011 1:59 pm

Maybe I am just ignorant of the wonders of a good epoxy, but I am afraid for your safety if you use any kind of glue, epoxy or whatever to hold the fitting in place. Again, I am actually afraid for your safety because of this. I am not joking.
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Unread postAuthor: jazzman56 » Mon Sep 26, 2011 6:29 pm

Moonbogg,

Thankyou for your concern but the diagrams and method outlined on this thread of how to place a fitting in and epoxy it in. Have NOT BEEN CARRIED OUT as a deduced that this was to hard for me to do at the current level of time. (Thanks JSR for the diagram and all your help :D :D :D ).

Gipetto,

I would have used a length of galvanized steel pipe BUT there is no sizes over 3/4 inch (20mm) and is ridiculousness overpriced. It's cheaper to by a extingusher than to buy steel threaded pipe pieces :(
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Unread postAuthor: jackssmirkingrevenge » Tue Sep 27, 2011 12:47 am

Moonbogg wrote:Maybe I am just ignorant of the wonders of a good epoxy, but I am afraid for your safety if you use any kind of glue, epoxy or whatever to hold the fitting in place.


I think it's just lack of experience with good quality adhesives. I cannot stress enough the importance of a join being well designed and adequately supported, but once it is the pressure it can take is quite impressive.
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