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CR mkI

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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CR mkI

Unread postAuthor: frankrede » Mon Aug 13, 2007 6:25 pm

This is my coaxial piston rifle.
It is piloted by a 1" modified sprinkler valve.
I still need to install a fill valve via steel T.

Edit:Notice the sprinkler valve top that Dr gave me?
The guns till needs to cure and it should be ready tomorrow.
It has a 3/4"sch 40 barrel and a 1" sch 40 barrel.


Future upgrades: semi auto/burst loader.
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Last edited by frankrede on Mon Aug 13, 2007 6:43 pm, edited 2 times in total.
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Unread postAuthor: Acdcmonkey1991 » Mon Aug 13, 2007 6:27 pm

Looks nice, clean construction. Put up damage pics ASAP.
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Unread postAuthor: mopherman » Mon Aug 13, 2007 6:34 pm

very clean. did you use clear primer? where were you going to put the fill valve?
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Unread postAuthor: frankrede » Mon Aug 13, 2007 6:44 pm

mopherman wrote:very clean. did you use clear primer? where were you going to put the fill valve?
In between the sprinkler and the chamber.Via a 1" steel t with a bushing down to 1/4"
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Unread postAuthor: potatoflinger » Mon Aug 13, 2007 7:08 pm

looks nice, can't wait to see some damage pics.
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Unread postAuthor: frankrede » Mon Aug 13, 2007 7:20 pm

Thanks, and it is soon to be semi automatic.

idea. that idea was ditched dude to the fact I wanted interchangeable barrels
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Unread postAuthor: CS » Tue Aug 14, 2007 2:28 am

Where you get the modified cap for the sprinkler...? Isn't that something DR/ RobcSmall offer? (Wasn't aware they had started doing that)

Anyway, noice launcher. I just recently built a a handheld launcher (bit smaller) just because ease of use.
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Unread postAuthor: frankrede » Tue Aug 14, 2007 2:35 am

pimpmann22 wrote:Where you get the modified cap for the sprinkler...? Isn't that something DR/ RobcSmall offer? (Wasn't aware they had started doing that)

Anyway, noice launcher. I just recently built a a handheld launcher (bit smaller) just because ease of use.
Dr gave it to me at the Vegas meet, and I have to say they are a beaut. I hope he starts offering for sale.
And about this cannon, any details?
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Unread postAuthor: CS » Tue Aug 14, 2007 2:52 am

Nothing special. 1" chamber, 1/2" barrel, 1/4" QEV, blowgun trigger. Just stuff I had in my shop, and I wanted something a little less dangerous when my friends have the destructive urge. Would post it, but yeah nothing special. I might build something of merit in the future.

Anyways, the threads not about me, so everyone else refrain from responding to this post.
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Unread postAuthor: frankrede » Tue Aug 14, 2007 2:58 am

Sounds fun nonetheless.
But ya, A question for evryone should I make this semi auto and ditch interchangeable barrels?If so what barrel size and any good ideas on a ammo that would work well in a semi auto gun with a 1/2" or 3/4" sch 40 barrel?
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 14, 2007 3:33 am

something spherical is probably your best bet, likemarbles/ballbearings
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Unread postAuthor: spud yeti » Tue Aug 14, 2007 9:24 am

Looks like a nice, fun gun to have. I think you should make it into a semi-auto marble/paintball gun. I definitely think semi-auto outweighs interchangeable barrels though.
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Unread postAuthor: frankrede » Tue Aug 14, 2007 3:33 pm

spud yeti wrote:Looks like a nice, fun gun to have. I think you should make it into a semi-auto marble/paintball gun. I definitely think semi-auto outweighs interchangeable barrels though.
Ya the upgrade will cost me about 10$, I still need to see if my piston seals fine before any mods happen.
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Unread postAuthor: Acdcmonkey1991 » Tue Aug 14, 2007 5:51 pm

I think you should go with a 3/4 in. barrel, but how do you plan on making it semi-automatic ?? (If you don't mind me asking)
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Unread postAuthor: frankrede » Tue Aug 14, 2007 5:56 pm

Its quite simple, I'll post pics after its done.I just did testing at 125 psi and it was quite loud!
But I the piston doesn't seal for crap. so I'll make a couple more pistons and maybe even some with o-rings.
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