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Finally, 4SPC completed (4" Sweet Piston Cannon)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Finally, 4SPC completed (4" Sweet Piston Cannon)

Unread postAuthor: LikimysCrotchus5 » Sat Apr 19, 2008 4:20 pm

I know i havent been posting frequently, but i have been just lurking, finding the right moment for me to post a comment. But im still here :)

Well i finally got my 4 inch piston cannon completed. It was a big project, but i managed to get it done. All my parts are pressure rated, but i have my concern about the pipe because i saw some lines on the pipe and i dont know if those are possibly stress lines, so i will take a picture as soon as i get the camera from my mom.

Enough rambling and on to the Specs:
Pilot: 3/4 inch QEV from mcmaster piloted by a 3/4 inch ball valve
Piston: 3 inch endcap
Sealing face: 1/8 inch thick neoprene from Mcmaster
Barrel: 3" 10'
Chamber: 4" 8'

My fittings are mostly from Sprinkler.com except the 4x3 bushing, which i screwed up the first time, so i bought it from Mcmaster.

She gives nice recoil at 30 with no barrel.

I have used my cannon a little and it was good, but i still have some problems to fix and some things to finish.
I need:
a barrel support
a breech loading
something to support my sealing face
paint it
name it

I have used my gun to 60 psi, and its pretty powerful, but i havent been using ammo that completely fits 3", but that wont be a problem as soon as i make some pykrete.

Since my piston is an endcap, and the face is rounded, i need to make it straight, so that my piston wont leak. So i at first had a 4 inch OD grinding wheel, which didnt last long because when it would slam against the barrel to seal, it would start to break, until one side was just completely broken. So that was removed and i tried it without. Worked fine, until 30 psi, where the sealing face passed the ID if the barrel and it would release the air.

So my question is, which washer would be good enough for a something to support my sealing face, where in the presence of force would not bend nor deform?

Would this be good? 91117A260 on mcmaster

Pictures are not possible now due to the lack of a camera at the moment, but will be here soon.

EDIT:
Image
the cannon

Image
Pilot setup with a 1/4 cross from mcmaster

Image
3" 10' barrel

Image
Front of piston

Image
Side of piston

Image
Back of piston

Image
Comparison from small piston tee gun to my big one

Image
Broken grinding wheel that was my sealing face support

So what do you think? I have a question but i forgot it, if i remember ill edit.
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Last edited by LikimysCrotchus5 on Sat Apr 26, 2008 7:27 pm, edited 7 times in total.
4SPC, My 4" piston 3" porting cannon
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Fix up 4SPC
Start Stirrup pump
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Unread postAuthor: jrrdw » Sat Apr 19, 2008 4:26 pm

Name it "Finally". For the sealing face, use a metal washer that is allmost the inside diameter of your barrel. That will keep the rubber from sucking into the barrel.
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Unread postAuthor: STHORNE » Sat Apr 19, 2008 4:33 pm

sounds like an awesome gun. hope you find a camera soon... I wana see some pics of this beast you speak of lol.

name suggestion = the "Breath-Taker"
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Unread postAuthor: Blitz » Sat Apr 19, 2008 4:49 pm

Heh heh, this will be more powerful than CF -- nice job! Can't wait to see it.
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Unread postAuthor: Eddbot » Sat Apr 19, 2008 5:55 pm

or "Finality"
message too short
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Unread postAuthor: LikimysCrotchus5 » Sat Apr 19, 2008 6:50 pm

That not a bad idea eddbot, i like breath taker as well, or breath giver, because of how much air this thing outputs :lol:

Thx jrrdw, ill just look for one on mcmaster and them ill confirm it with you if you think its good.
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4SPC, My 4" piston 3" porting cannon
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Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
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Unread postAuthor: STHORNE » Sat Apr 19, 2008 6:54 pm

for the name, you could even do something bad ass like...

"Grave-Digger" or "Death Whistle"

but its all up to you....
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Unread postAuthor: LikimysCrotchus5 » Sat Apr 19, 2008 7:21 pm

You got some nice ideas for names.
Im not that creative so i will rely on you guys.

I will take those into consideration though.

Would this be good? 98264A200 on mcmaster
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Last edited by LikimysCrotchus5 on Sat Apr 19, 2008 7:26 pm, edited 1 time in total.
4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
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Unread postAuthor: elitesniper » Sat Apr 19, 2008 7:22 pm

The ''Why Cannon''?
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Unread postAuthor: STHORNE » Sat Apr 19, 2008 8:25 pm

Why the "why" lol.
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Unread postAuthor: XxtriviumxX » Sat Apr 19, 2008 8:25 pm

The "4" Piston Cannon" :roll:

Cant wait for some pics. :D
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Unread postAuthor: LikimysCrotchus5 » Sat Apr 19, 2008 8:27 pm

Well i need something more creative, lol but thx or suggesting.

My mom should be home soon from the auction so i will be taking the camera and loading pictures.
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4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
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Unread postAuthor: bigbob12345 » Sat Apr 19, 2008 8:35 pm

how bout something simple like the 4in sweet piston gun or 4inSPG
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Unread postAuthor: STHORNE » Sat Apr 19, 2008 8:51 pm

that sounds pretty cool for something along military lines.

or even simpler, "4SPG"
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Unread postAuthor: bigbob12345 » Sat Apr 19, 2008 8:55 pm

4SPG
I like it
Lets see if LikimysCrotchus5 likes it too
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