A few pneubie questions...
Posted: Wed Jul 02, 2008 12:09 am
I'd like to start off with saying hello to everyone! I've finally decided to pursue my dream of building a pneumatic rifle, and throughout my many hours of research, I've probably spent a good 10-12 hours lurking around spudfiles in the last day or so. I am still shocked at the gold mine of information here on such an underground topic.
Let me apologize up front for any typos/illogical phrases (such as the word illogical), I am running on little to no energy typing this.
I've read the first 15-20 pages of topics in the pneumatic cannon board as well as many other boards, and although I've learned quite a bit, I still have a few questions (the search box returns hundreds of results for any search, which isn't always practical).
A quick bit of background on my project before I get to the questions:
I am looking to build a sniper rifle, probably with a 1/2" or 3/4" barrel, breech/bolt loading, possibly interchangeable (more on that in the questions), and I plan to use a modded sprinkler valve. I Will have a bit of scrap 2" pvc left over from a home plumbing project, I was thinking I could use a portion of this for the chamber/tank (assuming it is pressure rated).
Below I'll list any questions that I can think of, but I promise I'll forget a few, and I promise that some previously discussed questions will make an appearance on my list, but here it goes:
1.) Is 2" pvc acceptable for a chamber/tank when the barrel is going to be 1/2" or 3/4"? Should I use something more/less narrow? (remember the 2" will be free if I decide to use it)
2.) What would be the most effective barrel length for 1/2" and for 3/4" for a sniper rifle?
3.) With the above barrel length, what would be the most effective chamber/tank dimensions? (I've been playing around with GGDT but I think I'm doing something wrong).
4.) Is CPVC worth it for any portion of the gun? (remember I'll be using a modded sprinkler valve, so max psi will be <150psi).
5.) Would it be possible/efficient to make interchangeable barrels with a 1/2" and a 3/4"? Remember, both would be breech loading, so they'd be inside of a thicker tube. What kind of parts/adapters would I need to make this possible?
6.) In addition to the previous question, would it be possible to have a third barrel, probably 1" or so (whichever size is used for golfballs)? this wouldn't be breech loading.
7.) Back to the chamber/tank, is it worth it to put a larger piece of pvc snug around my 2" tank for extra support, or is this not needed with my psi range (<150psi)?
8.) For the barrels, which type of pvc would be best, ex: sch40, sch80, cpvc, etc? If it helps, the ammo being used would probably be:
1/2" - probably marshamallows in residential areas, maybe some small marbles, AA batteries, and possibly small paintballs (which caliber for this type of pvc?)
3/4" - Maybe marbles if they don't work well with the 1/2", paintballs (which caliber?)
?" - Golfballs?
9.) I know I forget many of the questions that I had, so I'll edit them in between these lines when I think of them:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1.) Woo already remembered one! Would it be worth it to put both a schraeder (spelled that wrong) AND a quick connect on my chamber/tank, or will more holes make it weaker?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Thanks for taking the time to read this unorganized wall of text! (I promise it won't happen again)
Hopefully I can hit up Home Depot tomorrow morning if I can plan out a shopping list for my build before then.
I've reread this once or twice, but it is tiring, so if something doesn't make sence, please let me know.
[Good god this is like 650 words, sorry again for that]
Let me apologize up front for any typos/illogical phrases (such as the word illogical), I am running on little to no energy typing this.
I've read the first 15-20 pages of topics in the pneumatic cannon board as well as many other boards, and although I've learned quite a bit, I still have a few questions (the search box returns hundreds of results for any search, which isn't always practical).
A quick bit of background on my project before I get to the questions:
I am looking to build a sniper rifle, probably with a 1/2" or 3/4" barrel, breech/bolt loading, possibly interchangeable (more on that in the questions), and I plan to use a modded sprinkler valve. I Will have a bit of scrap 2" pvc left over from a home plumbing project, I was thinking I could use a portion of this for the chamber/tank (assuming it is pressure rated).
Below I'll list any questions that I can think of, but I promise I'll forget a few, and I promise that some previously discussed questions will make an appearance on my list, but here it goes:
1.) Is 2" pvc acceptable for a chamber/tank when the barrel is going to be 1/2" or 3/4"? Should I use something more/less narrow? (remember the 2" will be free if I decide to use it)
2.) What would be the most effective barrel length for 1/2" and for 3/4" for a sniper rifle?
3.) With the above barrel length, what would be the most effective chamber/tank dimensions? (I've been playing around with GGDT but I think I'm doing something wrong).
4.) Is CPVC worth it for any portion of the gun? (remember I'll be using a modded sprinkler valve, so max psi will be <150psi).
5.) Would it be possible/efficient to make interchangeable barrels with a 1/2" and a 3/4"? Remember, both would be breech loading, so they'd be inside of a thicker tube. What kind of parts/adapters would I need to make this possible?
6.) In addition to the previous question, would it be possible to have a third barrel, probably 1" or so (whichever size is used for golfballs)? this wouldn't be breech loading.
7.) Back to the chamber/tank, is it worth it to put a larger piece of pvc snug around my 2" tank for extra support, or is this not needed with my psi range (<150psi)?
8.) For the barrels, which type of pvc would be best, ex: sch40, sch80, cpvc, etc? If it helps, the ammo being used would probably be:
1/2" - probably marshamallows in residential areas, maybe some small marbles, AA batteries, and possibly small paintballs (which caliber for this type of pvc?)
3/4" - Maybe marbles if they don't work well with the 1/2", paintballs (which caliber?)
?" - Golfballs?
9.) I know I forget many of the questions that I had, so I'll edit them in between these lines when I think of them:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1.) Woo already remembered one! Would it be worth it to put both a schraeder (spelled that wrong) AND a quick connect on my chamber/tank, or will more holes make it weaker?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Thanks for taking the time to read this unorganized wall of text! (I promise it won't happen again)
Hopefully I can hit up Home Depot tomorrow morning if I can plan out a shopping list for my build before then.
I've reread this once or twice, but it is tiring, so if something doesn't make sence, please let me know.
[Good god this is like 650 words, sorry again for that]