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2" Barrel Sealing Tee 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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2" Barrel Sealing Tee Cannon

Unread postAuthor: frogy » Sat Jan 19, 2008 11:57 pm

Here's another cannon I've turned out in the past week...

After my time off Spudding I've made up so many projects... I've got a half a notebook full of concept drawings!!!

Here's another one of my projects... Completed in a day, except for painting, a 1" female, and a 90 degree elbow...

Old Valve: (Broke trying to fix bad pilot)
2" BST Parts [w/o-Hardware]:
2" BST Front [Interior]:
2" BST Rear (Seal) [Interior]:
2" BST Rear [Exterior]:
2" BST Needs Brass Elbow
2" BST Valve Finished:
2" BST Gun Finished:


Edit:
Gun Update!

This gun has went through quite a bit since the last update... I've broke the piston multiple times and have broke the valve completely since the first build... I've also went with various new pilot valves...

Broken Piston vs. Unbroken Piston: Both have thin neoprene
Image

Piston Comparison: Thin Neoprene vs. Thick Neoprene
Image

2" BST Front:
Image

2" BST Rear:
Image

Homemade Pilot:
1" to 1/2" BST

1" BST Front:
Image

1" BST Rear:
Image

1" BST Complete:
Image

Completed Gun Pictures:
2" BST Valve Finished w\ Sprinkler pilot:
Image

2" BST Gun Finished w\ Sprinkler pilot:
Image

2" BST Gun Finished w\ 1" BST pilot:
Image

You can obviously see that I test shot this gun, due to the broken piston... A giant spring to recoil the piston forward would have prevented that problem, but I don't have and giant springs :)

This gun is very strong for being bottlenecked from 3" to 1" back to 2"... Firing at 60 PSI or so I shot a plastic practice golfball (with holes all over in it) a good 150 feet with no barrel at all... I can't wait to get a golfball barrel on this thing :P

Sorry for the bad quality of the Finished gun images... I was taking the pictures from about 4-5 feet away while still on the close-up "Flower" image focusing settings... I'll take new ones eventually :P
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Last edited by frogy on Sat Feb 02, 2008 4:25 pm, edited 14 times in total.
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Unread postAuthor: LikimysCrotchus5 » Sun Jan 20, 2008 12:03 am

Nice. To bad you cant use it now :roll:

But it looks like we should see some nice results with that, as soon as it warms up.
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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: frogy » Sun Jan 20, 2008 12:05 am

Heh... I see you don't go to sleep either :)

It's only 12:05 AM :D


The nice thing is that I live about 3 miles from a Lowes store... so as soon as I wake up, I'll drive there and buy the parts to fix it...
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Unread postAuthor: LikimysCrotchus5 » Sun Jan 20, 2008 12:07 am

Now thats dedication.

Yea but im not too tired, ill go to bed when my body tells me to :)
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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 » Sun Jan 20, 2008 12:14 am

That looks like a very well made valve
It looks like the cannon you are going to put it on will get some pretty good power.
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Unread postAuthor: frogy » Sun Jan 20, 2008 10:05 pm

Finished this one off today!!!

Hope the blow gun doesn't blow out... I may have to buy a longer nipple, attach the blow gun with a compressor hose, or redo the end cap entirely...

I think I'm going to fire this gun at high PSI with a remote fired blow gun... I'm trying to get the end cap to break off... I hate the job I did on the end cap, and I could possibly throw out the $5 of PVC parts just for the reason that I drilled the holes to close together and too big... and then tapped them very crappily with a hex nipple...

Overall I like the valve, but the end plug just makes me mad for some reason... I hope it just blows out when I try to shoot the gun, since I haven't screwed it in with anything for reinforcement...

I wouldn't mind adding a spring to the piston also...

:shock: Wow... Talk about rambling... Do I ever shut up?
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Unread postAuthor: frogy » Mon Jan 21, 2008 3:16 pm

This gun is insanely powerful from what I expected...

My last 2" based BST wasn't as powerful, due to the very small gap between the piston in open position and the piston is closed position... It barely moved at all between the two positions, so the airflow was restricted...


Apparently the seal on the pistol is pretty shotty... (I tried to make it loose, but it's a tad to small). The blowgun doesn't vent air fast enough to create a vacuum to pull the piston back... So I unscrewed the blowgun...

Without having another ball valve... I was holding my finger on the hole while the gun was filling, shutting off the inlet valve, and then removing my finger off the blowguns previous hole... Even at 20 psi (the highest I could hold it in with my thumb), the gun was producing strong winds about 10 feet away :lol: weather forecaster...
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Unread postAuthor: elitesniper » Wed Jan 23, 2008 9:08 pm

wait so the piston valve isnt sevice able? :shock:
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Unread postAuthor: frogy » Wed Jan 23, 2008 9:45 pm

It's ok... I ruined it anyway... Sorry I didn't post images here...

Trying to hack saw off the end cap to replace it with a 2" to 1" bushing, I broke my miter box (if not already broken) and started sawing on an angle...
Ruining the $6 or so of PVC fittings... They could be partially recoverable though...

Image

Image


Here's the piston by the way:
Image

20.9 grams


Why does the piston need to be serviceable?

How would I make it serviceable anyway? Add 2" pipe instead of a plug... Then add a much longer piston and a 2" to 2.5" bushing with a 2.5" male and female cap?

A piston that fits in 2" pipe won't fit out a 2" male will it?
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Unread postAuthor: elitesniper » Wed Jan 23, 2008 9:47 pm

look at my thread , a 1 1/4 coupler fit perfectly in sch40 2'' pipehttp://www.spudfiles.com/forums/2-piston-1-5inch-porting-finaly-done-t12817.html
a piston should be serviceable because if it screaws up you can open it and fix it.
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Unread postAuthor: bigbob12345 » Wed Jan 23, 2008 10:21 pm

I learnt that serviceable lesson the hard way. I had a 2in piston a while back that wasnt serviceable and the piston got a little deformed and wouldnt seal. I ended up just sawing off the barrel and chamber and throwing away the valve(kept pilot assembley)Because it was useless.
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Unread postAuthor: elitesniper » Wed Jan 23, 2008 10:23 pm

what was your piston anyways?
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Unread postAuthor: bigbob12345 » Wed Jan 23, 2008 10:27 pm

It was hot glue and I accecedently left it next to a heating lamp the rest of the story explains itself.
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Unread postAuthor: frogy » Wed Jan 23, 2008 10:28 pm

I guess it won't cost that much more, but I'm probably just going to work with the current one...

I can screw in a small piece of 2" pipe and a 2" coupler, then extend the current 1" pipe with a coupler, so I have just enough room for a piston, which is constrained by a 2" by 1" bushing (slip x thread)...

Then I can hook up a sprinkler \ small tee for a pilot...
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Unread postAuthor: elitesniper » Wed Jan 23, 2008 10:30 pm

make sure your pilot volume isnt to big
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Last edited by elitesniper on Thu Jan 24, 2008 9:16 pm, edited 1 time in total.
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