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In need of help

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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In need of help

Unread postAuthor: Spedy » Tue Jul 10, 2007 3:47 pm

Currently I can't build a spud gun, due to the fact that my Lowes doesn't carry 3" pvc and all the abs it has is foam-core..... Where do all you people get you 3" from? just wondering.
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Unread postAuthor: Kufive » Tue Jul 10, 2007 4:20 pm

I usually just get my pvc at Home Depot, not to expensive and every one i have been to carries most sizes from 1/4" - 4" diameters
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Unread postAuthor: rednecktatertosser » Tue Jul 10, 2007 4:30 pm

Look for a 'Ewings Irrigation Suppy' in your locality, they carry pressure rated stuff up to 10" around here
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Unread postAuthor: Spedy » Tue Jul 10, 2007 5:17 pm

wow, 10"? I don;t think we have Ewings in the US though..... I'll half to look around though.... Come to think of it, I haven't even checked my home depot yet. lol
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Unread postAuthor: singularity » Tue Jul 10, 2007 11:39 pm

look for a local plumbing supply store (the one near me is called Salem plumbing supply) they tend to a little bit pricier but they carry just about any type of pipe or fitting
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upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: homedepotpro » Tue Jul 10, 2007 11:46 pm

cell core abs is ok for spray and shoot guns, they are more shock resistant
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Unread postAuthor: Pete Zaria » Wed Jul 11, 2007 12:46 am

What kind of cannon do you want to build?

For a pneumatic, you want NSF-PW PVC, which many hardware stores don't stock (They only have the DWV stuff, not pressure rated).

For a combustion, the cell-core ABS would probably be fine. I've built two propane-powered combustion guns with cell core ABS with zero failures over several hundred shots. It's definitely safe for hairspray and aerosol fuels, but propane *could* eventually cause problems. I don't worry about it because if ABS does fail, it generally fails with very little or no shrapnel.

As suggested, try plumbing supply and irrigation stores. Also consider asking a construction company where they buy bulk pipe from, etc... until you find a source. Lastly, you can buy it online, but the shipping can be steep. McMaster sells pipe. You could probably get pimpman or bcpneumatics or sgort to ship you pipe.

Peace,
Pete Zaria.
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Unread postAuthor: pyrogeek » Wed Jul 11, 2007 12:49 am

We have a Connor Company plumbing place, which carries Schedule 80 PVC pipe. They don't carry the illusive 1.5in Schedule 21 though.

There are a couple home improvement stores around here that have pressure rated pipe, but indeed, Lowes isn't one of them. Menards and Farm&Fleet do though. No one store carries everything though, so I may go to one store for iron and brass fittings, another for PVC pipe and another for the respective fittings. It burns a lot of gas and time getting everything for spud guns.
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Unread postAuthor: psycix » Wed Jul 11, 2007 6:25 am

Getting the parts is easier than assembling them.....
Look around, go to every store you think they might have it.
That includes all home improvement/DIY-stores or however you call that.
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Unread postAuthor: Spedy » Wed Jul 11, 2007 12:14 pm

Cell-core is okay for combustions? didn;t have a clue. I am planning on using "Static Guard" for fuel.

Thanks for the tips everybody. :)
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Unread postAuthor: sandman » Wed Jul 11, 2007 12:17 pm

cell core ABS is
cell core PVC is not
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Unread postAuthor: spud yeti » Wed Jul 11, 2007 12:21 pm

Because ABS doesnt have much schrapnel, it "tears/ruptures, but PVC does have schrapnel.
BTW, correct me if im wrong!
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really good quote/phrase here
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Unread postAuthor: sandman » Wed Jul 11, 2007 12:34 pm

you are correct
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Unread postAuthor: Spedy » Wed Jul 11, 2007 5:53 pm

Okay, thanks everyone. But a though just popped up. is there any specific thing you need to solvent weld abs?
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Unread postAuthor: Kenny_McCormic » Wed Jul 11, 2007 9:04 pm

my local menards has an assload of pipe including the impossible to find sdr 21.
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