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Barrel in Chamber, Gun #4

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: JET47 » Tue Mar 25, 2008 9:41 pm

hey man, i spent a long time in the forums trying to get how piston guns worked, sorry if i didnt realize the pilot area had to be that that small lol.

ya ima have to redo that whole back peice i think. i don't know if the unscewable part is really worth it, since the different inside diameter makes me have to make the piston weird, i didn't mention that before.

i think ill extend the back of the chamber a little bit for the piston, and stick a 4"-1" bushing assembly on to save the ball valve, and mount the schrader valve somewhere in there. pity i dont have the threading tools down here >.<

i would have gone with the sprinkler valve in the first place, it looked the easiest, cept i don't think i could get one down here, im in the virgin islands, alot of places don't like to ship to us =( so i went for the piston instead
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Unread postAuthor: elitesniper » Tue Mar 25, 2008 9:53 pm

Its a good thing you went with a piston, they have way more power then a sprinkler would ever have :roll:
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Unread postAuthor: fireman565 » Tue Mar 25, 2008 10:08 pm

I think Starman was talking about using the sprinkler valve for the pilot valve, not the actual main valve, which would be a big improvement, if you could get one. Home Depot should carry them.

Lose the "Y". You don't need it. If you have a threader, thread the schrader into the pipe just behind the "new" bushing you need to replace the dwv reducer.. :wink: I couldn't find a 4" to 1" bushing, so I went with a 4" - 2" bushing, then a 2" - 1" bushing, piloting with a 1" sprinkler valve modded.

I tried the "threaded" approach to accessing the piston for maintainence. I couldn't get it to seal like I wanted. I instead went to a slip bushing. I just glued a section of pipe into the back of the tee which housed my piston. I then bolted it on with four small bolts with sealant. All I have to do is take the bolts out, and slip off the bushing/pilot valve for access.
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Unread postAuthor: elitesniper » Tue Mar 25, 2008 10:25 pm

He said he wished he had a threader. :)
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Unread postAuthor: Lentamentalisk » Tue Mar 25, 2008 10:30 pm

still you can just drill a hole in then put on lots of epoxy... thats what I did and I haven't been shot with a supersonic schrader valve... yet...

edit: I gotz me red starz!!!
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Last edited by Lentamentalisk on Tue Mar 25, 2008 10:33 pm, edited 1 time in total.
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Unread postAuthor: elitesniper » Tue Mar 25, 2008 10:33 pm

Gahh, when screws or threaded shraders pop out it wont even be strong, there is so little surface area for the air to act on.
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Unread postAuthor: Lentamentalisk » Tue Mar 25, 2008 10:37 pm

exactly why it is safe to epoxy in the valve in the first place, there is only around 1/10 to 1/20 of you psi in pounds of force pushing on it, so the glue doesnt even have to be that strong to stay in
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Unread postAuthor: MrCrowley » Tue Mar 25, 2008 11:09 pm

I didn't write <A HREF="http://www.spudfiles.com/spud_wiki/index.php?title=Identifying_Pressure_Rated_PVC">this</a> for no reason :)

It's about identifying DWV btw 8)
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Unread postAuthor: starman » Tue Mar 25, 2008 11:20 pm

fireman565 wrote:I think Starman was talking about using the sprinkler valve for the pilot valve, not the actual main valve, which would be a big improvement, if you could get one. Home Depot should carry them.


Yes I was talking about replacing the PVC ball valve pilot in the rear with a sprinkler valve. You're on the right track going with a piston, just be prepared to fiddle with it some to get it right.
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Unread postAuthor: elitesniper » Tue Mar 25, 2008 11:21 pm

Mr.C you should send that to every new member who joins, so we wouldn't have so many post about is this dwv?, OMG I I USED DWV!!, and so on. :)
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Unread postAuthor: MrCrowley » Tue Mar 25, 2008 11:27 pm

I know eh, I need to distribute that thing. Wish I had that when I started out...


Back in my day.... We didn't have nuthin'. We had to learn it the hard way, this new generation is so spoilt they don't even realise... :D

I just wish school study was as fun as spud study :)
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Unread postAuthor: elitesniper » Tue Mar 25, 2008 11:31 pm

Spudgun University :D what a dream :)
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Unread postAuthor: starman » Tue Mar 25, 2008 11:44 pm

elitesniper wrote:He said he wished he had a threader. :)

Surely they have a 7/16 drill bit and a 1/4" NTP tap available somewhere there. Not at the corner drugstore but it isn't plutonium either.

I could see sprinkler valves being irrelevant there...mucho grande rainfall in the caribbean...
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Last edited by starman on Tue Mar 25, 2008 11:47 pm, edited 1 time in total.
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Unread postAuthor: fireman565 » Tue Mar 25, 2008 11:47 pm

elitesniper wrote:He said he wished he had a threader. :)


Second image.... "IMG_0512 Medium Web view.jpg
Description: back end. schrader valve is screwed directly into the pvc (used a threading tool) with teflon tape


Lentamentalisk wrote:still you can just drill a hole in then put on lots of epoxy... thats what I did and I haven't been shot with a supersonic schrader valve... yet...


LOL... It's just the image of a schrader buried up in my forehead.. is the reason I either place a nut on the inside of the chamber, or epoxy it in... :D
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Unread postAuthor: JET47 » Sun Apr 06, 2008 1:32 pm

Ok,
remade the whole pilot end and plugged the piston, and it still wont seal >.<

pictures attached.

ive tried it with a nice bicycle pump and a 125psi compressor, no dice.
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Attachments
IMGP3899 Medium Web view.jpg
Piston
IMGP3897 Medium Web view.jpg
Sealing Face, supported from behind
IMGP3898 Medium Web view.jpg
Pilot Face, plugged and with a bumper
IMGP3902 Medium Web view.jpg
New Pilot Assembly, the sleeve is schedule 80, store didnt have any 40 when i went
IMGP3900 Medium Web view.jpg
Inside Chamber and Barrel, test ammo included, if it would ever fire. sry flash kindve made it too blinding to see
IMGP3900 Medium Web view.jpg (22.48 KiB) Viewed 226 times
IMGP3903 Medium Web view.jpg
Everything Lined Up
IMGP3907 Medium Web view.jpg
Going in.. theres a couple more i think this is enough pictures though lol
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