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RevoSemi

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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RevoSemi

Unread postAuthor: keep_it_real » Mon Apr 23, 2007 9:53 am

RevoSemi

[youtube]http://www.youtube.com/watch?v=AOJBshVzoAI[/youtube]
The first load is at 30 psi the second is around 50. I really don't know if thats right though because the regulator is a piece of crap.

[youtube]http://www.youtube.com/watch?v=8Iui90eljrI[/youtube]
This is around 70 psi I think. Ignore that kid that I called "chaseykin"


Description

RevoSemi holds ten nerfs although the tank that's on there right now can only hold enough for about 5 or 6 good shots. I don't have a compressor so I can't show you it's full capacity. It took probably 1 and a half to 2 months to make (I kinda forget but it's been a while). There is a regulator on there between the main chamber and the firing chamber. All I can say is that the regulator is realllllyyy slow and inconsistent. Sometime I'll just invest in a co2 regulator from palmers pursuit but 90 bucks is a lot. Anyway, I'm still not clear on whether it's ok to use regulated co2 in pvc.

Design
Surprisingly enough, I just winged this gun. The only thing I ever wrote down on paper was how the part that spins the revolving disk was going to work. I opened up a Nerf Maverick for some help on how it worked.
Heres my first prototype of the whatchyamacallit:
http://www.spudfiles.com/forums/revolver-t6497.html
That one didn't work. I made a new one that works ten times better. The only difference is there isn't as much space for the pin to slide around in. It's more of a track than teeth type things.

Stuff
Sometimes I have a feeling to whether a gun will work and I can tell you, I wasn't feeling to good until I fired off the first shot and amazed myself (thanks for the quote "hi"). First, I couldn't get the whatchyamacallit thing to work, then I had to do countless hours of sanding/filing to get a small piece of 1/2" inside 3/4" inside, 1", which was inside a 1" coupler and viola! I had a piece that turned when you moved the slide valve. My next biggest problem was getting a some sort of good seal between the cartridge and the sprinkler valve. What I did was cut out a small piece of wood with a hole in it and sanded it down (took way too long) so that it fit inside 1" sch 40. So when the gun shoots the wood shoots forward and hits the cartridge and the air goes through the hole. Normally, the piece only has to move a tiny bit so not much air is wasted. The last problem was the actual barrel. I made this barrel that looked way cool. I modeled it after the Ultimate Inline II by neospud. Later, I figured out that that since I didn't have a seal between the cartridge and the barrel that there was too much friction and it slowed the nerf way down or it didn't even make it out. After some hours of deep thought, I realized this with a certain amount of duh factor and I reluctantly took the barrel off. It doesn't look quite as cool but it's frickin' sweet.

I'll get some better pictures in a while.[/youtube]
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Attachments
PICT0084.jpg
Firing stuff. If/When I get a co2 regulator, I can take off the reservoir and it sort of turns into a 2 handed pistol (oxymoron)
PICT0083.jpg
PICT0082.jpg
Wooden bolt with a hole in it. It works better than I thought it would.
PICT0080.jpg
Ahhh
PICT0079.jpg
Yup, she's a beauty.
IMG_0350.jpg
Revamped Revosemi
Last edited by keep_it_real on Thu Mar 27, 2008 11:51 pm, edited 4 times in total.

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Unread postAuthor: chaos » Mon Apr 23, 2007 9:58 am

nice job man, really good use of moving parts and all... now all ya need to do is bump it up to 100psi :twisted:
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Unread postAuthor: mega_swordman » Mon Apr 23, 2007 10:15 am

Now that is really nifty. New, interesting, and has potential. I look forward to seeing it at the best of its abilities.
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Unread postAuthor: super spuder » Mon Apr 23, 2007 11:04 am

that is kool with the whole revolving thing, nice gun. you ahould make a revolver that shoots marbles :twisted: that would be kool
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Unread postAuthor: bboymatty » Mon Apr 23, 2007 11:45 am

looks like its a bit underpowered, especially for nerfs. You should definitely try upping the pressure to get some more power in those shots hey
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Unread postAuthor: Hotwired » Mon Apr 23, 2007 3:12 pm

I like the innovation in this :D

I particularly like the the rotating barrels, moving parts that have to have a decent seal are always tricky so good stuff getting it to work :)
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Unread postAuthor: skinner » Tue Apr 24, 2007 7:17 am

Very well done.

Its really good to see that someone has pretty much perfected a gatling gun style cannon, would be a real use if it was souped up to pump out 100 psi. and then had cartridges filled with paintballs, and when all of the cartridges are spent, replace the wheel and keep going, would be a killer in the feild.

Sweet work, keep it up.

--Skinner
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Unread postAuthor: keep_it_real » Tue Apr 24, 2007 6:35 pm

Thanks for the comments.

The only reason I'm not taking it up higher is because I'm scared of the wooden bolt breaking when it hits the cartridge. I thought about putting rubber on the front of the bolt but when the next cartridge comes around it would get stuck on the rubber. I rounded the bolt so this wouldn't happen.

On the other hand, I think I'm gonna go take another video with the pressure cranked up a bit.
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Unread postAuthor: wannabie » Tue Apr 24, 2007 8:07 pm

sweet gun how do you get the thingo to revolve looks like you pull back on that blue thing in the middle?
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Unread postAuthor: keep_it_real » Tue Apr 24, 2007 8:38 pm

Go to the link in my post under the design section. It shows a picture of the thing I made that turns the revolver. I made a better one than that though. It's just tighter. But yes, I pull back on the blue slide valve which shoots it and turns it a bit.
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Unread postAuthor: Solar » Tue Apr 24, 2007 11:23 pm

Congratulations. You are the only other person that I've seen in the last six years to use a cam for their drive mechanism. The Eclipse Semi-auto uses a modified ramping cam that is designed to reduce friction and is machined from 7075 tubing on a four axis CNC. It is the most precise way to achieve high indexing rates. The Pancor shotgun uses a Webley Fosberry style cam like the one Van Helsing used in the movie. This logic didn't work as well, so I went with a different variant that allowed a simple design for the linear conversion. These designs hail back to Dionysus and his revolving arrow launcher. [/img]
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Unread postAuthor: CS » Wed Apr 25, 2007 12:44 am

Noice launcher!

I find it hard myself to just get off my ass, and build something. Much less something of this magnitude. Good job in just turning a theoretical idea into a actual functioning gun. Aesthetically it also looks very nice, something hard to do when your trying to pull off a fairly new idea for the first time. Also from the sounds of it your using a rather limited tool supply. Nice work, if it means anything coming from me.
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Unread postAuthor: zeigs spud » Wed Apr 25, 2007 2:22 pm

very nice cannon, clean, cool looking, and did i say cool? lol
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Unread postAuthor: bobbyeggo » Wed Apr 25, 2007 7:04 pm

That's ultra nifty man.
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Unread postAuthor: Los Frijoles » Fri Apr 27, 2007 2:42 pm

That looks really insanly cool canon/gun/pistol. Very nice idea behind the design.
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