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design for new gun

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: spudthug » Wed Mar 21, 2007 7:52 pm

uhh im working on modifying ur first drawing i like that alot...umm lets both draw that and when were done we will compare and see what i need to do (if u want) ((u dont have to if u dont want to)) (((jsut if ur bored)))
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: A-98 » Wed Mar 21, 2007 7:57 pm

well, i wouldnt need to put in much more detail for that one, just a schrader attached to a T, with the bottome of the T going to the blogun, and the left side going to the schrader.

and i take it that you dont want info on a stock for the third one? thats (semi) good, cause i actually need to stop procrastinating, and do my homework.
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Unread postAuthor: spudthug » Wed Mar 21, 2007 7:59 pm

lol ok....one more question...where would my psi guage be???
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Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: A-98 » Wed Mar 21, 2007 8:03 pm

ums, anywhere, chamber, pilot...not the barrel :lol:

ya, you could have it tapped into the chamber, or have it on the pilot assembly. i would suggest using a co2 setup or a compressor for qev's. i personally havent used them but ive heard that they take some fast pumping to get them to seal with a bike pump.

EDIT: ok, ive found one link showing the internals of theQEV.
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Unread postAuthor: spudthug » Wed Mar 21, 2007 8:14 pm

well heres my upgraded drawing tell me waht u think and i use a compresser.....


[img]_0231[/img]


umm look at my first psot i dont know how to get this to work ill post it there
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: A-98 » Wed Mar 21, 2007 8:20 pm

that wont fill it, it has to be filled from the pilot side, not the chamber side. and if you have a compressor i would go with a quick connect instead of a schrader.
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Unread postAuthor: spudthug » Wed Mar 21, 2007 8:30 pm

wait do u have a drawing of where the schrader should go...im confused..

ok i think i get what u mean but coul i fill it through the blowgun??? or does there have to be a schrader..well anyway just look at my post and picture it the other way around...guage where valve is and valve where guage is problem solved...right??? be back after next commercial
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Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: A-98 » Wed Mar 21, 2007 8:42 pm

yup, problem solved, however, it may be a tad awkward.

ill draw and post in a sec

what are you watching?

EDIT: and there it be! im rather proud of it.
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Unread postAuthor: spudthug » Wed Mar 21, 2007 9:13 pm

i was watching mythbusters now im watching south park....sorry for long wait.. i was helping my mom


EDIT:ooo and if you use a quick dis connect does it fill faster??? wont that look akward with a quick disconnect..it might look better than a mess of reducers though...post now or in the morning well c ya...and i will get all the parts tomorrow (hopefully) except for the qev and psi guage...so till then c ya..
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: A-98 » Wed Mar 21, 2007 9:16 pm

its ok. i do that all the time.

and incase your wondering the gold is brass fittings tapped into a plug in the T

EDIT: and yes, the quick connect will fill it faster, but youll want a female one hooked up, and then a male-ballvalve-male setup to connect to your female quick connect on the compressor
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Last edited by A-98 on Wed Mar 21, 2007 11:18 pm, edited 1 time in total.
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Unread postAuthor: MrCrowley » Wed Mar 21, 2007 11:17 pm

How did you connect that elbow to the fire extinguisher?
Im serious,Don't yell at me, why can't you tell? I've made some threads by using a kitchen tap but its not reliable past 120psi. I used two FE's on my gun here:
http://www.spudfiles.com/forums/viewtop ... 422&#56422
But I had to get them welded.
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Unread postAuthor: A-98 » Wed Mar 21, 2007 11:21 pm

i think he took it a*spud thug rips of head, body falls limply onto ground*

actually, i have no idea, and i would rather like to know. it may be some special fire extinguisher
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Unread postAuthor: MrCrowley » Thu Mar 22, 2007 2:07 am

Maybe he bashed the s-hit out of the elbow over the FE, somehow sealed it and leak proofed it and screwed a few scrwes in :P
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Unread postAuthor: spudthug » Thu Mar 22, 2007 5:35 am

ok well im up now and ill tell u how i got that elbow on....ok first i got a little 1/2 adapter...it fit into the hole put not good enough for a seal...so i pounded it in and it only went half way....the elbow that is on the wont work anymore...there is a big a$$ slit in it and i blew into it and it leaked like crazy....i just tapped it on with a hammer because it was like 2 mm biger than the 1/2 and it fit prefectly and i was gonna solder it...but then it broke as i said...peice o crap..so now as u see in my newer designs i am using a half in tee....idk if u noticed im just clarifying


EDIT: so basically it was a ghetto fitting.....then it broke....damn......
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: MrCrowley » Thu Mar 22, 2007 2:18 pm

Check this 'How-To' I made,it could help you,
http://www.spudfiles.com/forums/viewtopic.php?t=5296&

I used it on my very first FE gun here:
http://www.spudfiles.com/forums/viewtopic.php?t=5126&

Which adapted to this:
http://www.spudfiles.com/forums/viewtop ... 422&#56422

Because two FE's are so heavy and put alot of strain on the modded fittings I decided to get the FE's welded to some galv fittings.
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