design for new gun

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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spudthug
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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)))
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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A-98
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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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spudthug
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Wed Mar 21, 2007 7:59 pm

lol ok....one more question...where would my psi guage be???
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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A-98
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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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spudthug
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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
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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A-98
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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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spudthug
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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
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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A-98
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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.
Image
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spudthug
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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..
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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A-98
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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
Last edited by A-98 on Wed Mar 21, 2007 11:18 pm, edited 1 time in total.
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MrCrowley
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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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A-98
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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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MrCrowley
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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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spudthug
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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......
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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MrCrowley
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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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