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Semi-Auto Action

A place to ask general spud cannon related questions.
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Semi-Auto Action

Unread postAuthor: FreakyShotGlass » Tue Jun 19, 2007 12:53 am

I finally got round to making a semi-auto marble cannon on the weekend. At first I tried to use a paintball style blowforward design like this but it didn't work, tolerences required were to close and I don't have a lathe or access to pvc rod. So then I got thinking and came up with this design and it works perfectly.
Here is a little animation of the action that i made, some clearer 2D diagrams will come as soon as I install CS3.
Image
It should be pretty obvious how it works and where the magazine should go.
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 19, 2007 1:32 am

essentially it's the same concept as the other design, just built differently - videos in action please!
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Re: Semi-Auto Action

Unread postAuthor: experament-u2 » Tue Jun 19, 2007 2:23 am

FreakyShotGlass wrote: So then I got thinking and came up with this design and it works perfectly.


have u made it if you have post a video or some picture
please :D

oh and what program did you use to do the rendering? bongo?
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Unread postAuthor: FreakyShotGlass » Tue Jun 19, 2007 2:30 am

Ive made a gun with it but I left it at a mates house, I'm going to go get it tomorrow so I'll put some vids up then. I used 3DS Max for the render.
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Unread postAuthor: Hotwired » Tue Jun 19, 2007 4:29 am

So how is this semi-auto?

It looks fully automatic to me, just needs a constant air supply and a constant paintball feed - which could have the feed port blocked off by the bolty thing moving forward.
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 19, 2007 4:43 am

Hotwired wrote:It looks fully automatic to me, just needs a constant air supply and a constant paintball feed - which could have the feed port blocked off by the bolty thing moving forward.


that would take a lot of trial and error to get the spring tension correct enough for it to cycle continuously.

For semi-auto you need a separate valve to feed the air in pulses.
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Unread postAuthor: noname » Tue Jun 19, 2007 9:46 am

That's a really good animation, wish I could so stuff like that. Basically, that's clide's semi auto paintball gun.
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Unread postAuthor: to_live » Wed Jun 20, 2007 4:19 am

hmmm sorry but im a bit of a newb at stuff like this, could you possibly label it for me please?
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Unread postAuthor: Jumpin Jehosaphat » Wed Jun 20, 2007 2:48 pm

Ooh, I want to make one. Has anyone ever made a chart or list of all the different pipe specifications that can fit into one another?
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Unread postAuthor: sandman » Wed Jun 20, 2007 3:36 pm

look at the wiki, it has pipe stuff in there, but idk about pipe that fits into other pipe
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Unread postAuthor: us sniper » Wed Jun 20, 2007 11:55 pm

What type of valve are you using to control the flow of air. Does anyone know where I could get a 555 timer circuit. I think that this gun would be perfect hooked up to a bottle of co2. To control the fps of the paintball all you would need to do is change the tension on the spring
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Unread postAuthor: keep_it_real » Thu Jun 21, 2007 12:08 am

How did you stop the balls from rolling out? Did you do something like clide's golf ball gun or something else. And I'm guessing your using a clip or a hopper.
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