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UDTBC-10 (my new 3'' piston valve)

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: unisonmind » Sat Feb 02, 2008 10:57 am

well i was trying to find a clean barrel support for 3 days and then i was walking around at work stoped to help a customer and there it was

and the fancy rubber thing i stole from clide right off the home page pic
(thanks clide)

and yes it was clear primer
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THE DIFFERENCE BETWEEN A FLOWER AND A WEED IS A JUDGEMENT
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Unread postAuthor: Fnord » Sat Feb 02, 2008 12:33 pm

That'll make a nice inside-shooting-for-the-winter gun :)

Great job, it seems you have created one of the few large-bore cannons that don't look like a mess of parts.

It's nearly perfect, but it's going to need paint!
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Unread postAuthor: iknowmy3tables » Sat Feb 02, 2008 1:15 pm

you are truly a craftsman unison
so clean
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Unread postAuthor: clide » Sat Feb 02, 2008 10:18 pm

unisonmind wrote:and the fancy rubber thing i stole from clide right off the home page pic
(thanks clide)


I actually stole that from somebody else, unfortunately I can't remember who it was.

Slick gun, that thing will pack a wallop.
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<a href="http://gbcannon.com" target="_blank"><img src="http://gbcannon.com/pics/misc/pixel.png" border="0"></a>latest update - debut of the cardapult

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Unread postAuthor: mtronic » Fri Feb 08, 2008 6:07 am

one word.....omfg...... wow that is HUGE!!!!! Cant wait for the vids :D
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Unread postAuthor: glass_05 » Thu May 01, 2008 12:05 am

great looking gun. that is exactly what i want to build. how do you seal the back plug. i see an o-ring and something else. also did u just drill holes and run bolts through to keep it from shooting out?
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Unread postAuthor: Tooo Easssyy » Thu May 01, 2008 4:57 am

wow............
that looks awesome, great job with it, looks in great condition especially the piston valve.

get some movies with it soon to see what it really does, yeah !!!!!!
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Unread postAuthor: unisonmind » Thu May 01, 2008 2:33 pm

glass_05 wrote:great looking gun. that is exactly what i want to build. how do you seal the back plug. i see an o-ring and something else. also did u just drill holes and run bolts through to keep it from shooting out?


the back plug is a 3''nptx1.5''npt bushing(i use the npt x npt and not a slip x npt because it is more heavy duty)-- the yellow stuff is epoxy-- i put the bushing in a 3'' coupling and filled the gap with epoxy to give the plug good fit in the tee then used a file to put the o-ring grooves


Tooo Easssyy wrote:wow............
that looks awesome, great job with it, looks in great condition especially the piston valve.

get some movies with it soon to see what it really does, yeah !!!!!!


i was going to go blow something up today but it snowed ya i know its may but i live in colorado but i did make this little video the other day at work


[youtube]http://www.youtube.com/watch?v=5OsIM47-Mag[/youtube]
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Last edited by unisonmind on Thu May 01, 2008 3:00 pm, edited 1 time in total.
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Unread postAuthor: glass_05 » Thu May 01, 2008 2:52 pm

could u list a more detailed parts list? and any other information that would be usefull. i plan on making a gun very similar to this
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Unread postAuthor: JDP12 » Thu May 01, 2008 4:53 pm

first start by searching, then by reading the wiki, then search some more. isn't that complicated
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Unread postAuthor: glass_05 » Thu May 01, 2008 9:15 pm

okay. just noticed the new video. it helped me alot. i was wondering what the piston sealed against but now i can clearly see that. thank you!
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Unread postAuthor: dongfang » Fri May 02, 2008 2:06 pm

Hi,

Wow, very similar in size to my own Orange Accelerator.

That´s a beauty! I like the chamber in particular.

Are u sure those bolts are large enough? I would have used a few more or a little larger bolts.

Regards
Soren
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Unread postAuthor: unisonmind » Fri May 02, 2008 6:28 pm

ya i used 8 bolts and they 3/4'' long x 6mm so i think it should be fine-- what do you have in your cannon?
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Unread postAuthor: dongfang » Fri May 02, 2008 6:57 pm

Hi,

I used 12 * 6mm´s.

In another cannon, I had a 63 mm (ID) tee and 8 * 6mm bolts to hold the breech. That was too small / too few. There simply was too much (shear) pressure on the bolts when the piston hit the bumper; they started to deform the PVC. I have now changed that cannon to 8 * 8mm.

My rule of thumb (awaiting more verification - overkill or just right?) is now something like: Blot count * bolt diam. = tee diam.

Regards
Soren
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Unread postAuthor: unisonmind » Fri May 02, 2008 7:04 pm

ya maybe ill put some 8mm in there-- i used 9-4mm in my GB cannon so i was thinking 6mm would be ok but like you said overkill is not a bad thing - maybe ill even go with 3/8'' i have the room
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