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Allmost Done! [Updated with damage pics]

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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Unread postAuthor: Shrimphead » Thu Sep 14, 2006 10:09 pm

That's because reducer bushings are socket x spigot. Spigot means that it fits into a coupler, not normal pipe.
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Unread postAuthor: SpudStuff » Thu Sep 14, 2006 10:24 pm

Image

The large diameter is the O.D. Of the pipe. you need to install it into a Socket AKA a coupler,elbow,other bushing, ect...
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Unread postAuthor: jrrdw » Fri Sep 15, 2006 5:00 am

If it blows i'll have to do it that way, thx for the advice.
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Unread postAuthor: rna_duelers » Fri Sep 15, 2006 6:06 am

Nice nice,and this cannon looks like it will own ass.I would trust those reducers.Have you GGDT this valve/gun yet?I would like to no some figures becuase it looks like like it will work rather well.
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Unread postAuthor: jrrdw » Fri Sep 15, 2006 7:06 am

ChambersX2 = 3" X 5'
Barrel = 2" X 8'
Elbows X 2, 90 degrees
Connecting tubes X 2 = 2" X 1'
Pilot chamber 1 = 2" X 7"
1, 4 way X 2"
Piston fits inside a 2" sch40 pipe, (the pilot chamber) X 3 1/2" LONG
Max pressure i can get from my aircompressor is 110psi
Thats it, i don't think i missed anything, you tell me what the GGDT tells you, then i'll tell you what it told me.
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Unread postAuthor: jrrdw » Thu Sep 21, 2006 5:31 pm

I didn't have the barrel in far enough, the video is a bit dark, some of it, so here's the tare down Basterd !
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Unread postAuthor: jrrdw » Fri Oct 06, 2006 2:47 pm

Well the blow gun must not be venting the pilot chamber fast enough, because the piston still won't open! Basterd! What next? Mod a sprinkler valve?? What do you guy's think? Who else has had a problem with the piston not opening. What did you do to fix it?
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Unread postAuthor: WOW!! » Fri Oct 06, 2006 3:08 pm

Sweet! Nice job on that, and the reducers will be fine, I had them on my lanucher and they never blow up and I used it at like 80psi I think. As for the piolt vavle go with a modded sprinkler valve. O and did ya ever get that mini?
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Unread postAuthor: MrCrowley » Fri Oct 06, 2006 4:15 pm

jrrdw wrote:Well the blow gun must not be venting the pilot chamber fast enough, because the piston still won't open! Basterd! What next? Mod a sprinkler valve?? What do you guy's think? Who else has had a problem with the piston not opening. What did you do to fix it?


why not a 1" ball valve?
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Unread postAuthor: jrrdw » Fri Oct 06, 2006 4:38 pm

Well i did it, i broke down and ordered a 1" modded valve from Bcvids. If this does make it work i'm gonna give it up! So i guess i have to cut the end cap back off to attach the new sprinkler valve, so i probly need a 2" cupler, then reducer to the valve. I think i'll name it Basterd! Jet black and crome with red letters, what do you think about my paint sceem?
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Unread postAuthor: Flinchy » Fri Oct 06, 2006 6:01 pm

awesome, that cannon looks very similar to a cannon i have in my shop im working on right now. except for im just using two 1" sprinkler valves for the two 5' long 3" PVC chambers. ha, your one of the first to use a wood piston, im anxious to learn how that turns out. good luck.

-Flinchy
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Unread postAuthor: mark.f » Sat Oct 07, 2006 6:07 am

the reducers that said 3 to 2" wouldn't fit inside the 3" pipe i'm useing for chambers


That's because bushings fit into a coupler, buddy. :wink:
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Unread postAuthor: jrrdw » Sat Oct 07, 2006 8:54 am

SpudStuff wrote:Image

The large diameter is the O.D. Of the pipe. you need to install it into a Socket AKA a coupler,elbow,other bushing, ect...


Yea he said about the same thing, but thx anyway.
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Unread postAuthor: rna_duelers » Sun Oct 08, 2006 2:41 am

Have you got this to work yet?My piston cannon wouldnt fire properly with the blow gun attached with some hose so i just attached it to the valve itself and now it works.Is the piston the same size as the barrel becasue there might be no surface area for the airto push on for it to open.Was the 4 way intersection 3"??And what weight is the piston and how big is the pilot volume?LOL enough questions.
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Unread postAuthor: POS » Sun Oct 08, 2006 2:55 am

what's the diameter of the barel comapred to the one of the piston. The piston should be bigger, and when depressurising the pilot chambern the piston should seal it of from the main chamber.

I had the same problem on my first gun. The cnamber emptied trought the pilot valve, cause there was to little difference between the diameter of the barrel and the piston. Try to make the pistons diameter al big al possible.
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