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Gatling gun prototype

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: iknowmy3tables » Thu Jun 26, 2008 4:52 pm

whoops deleted, my computer was acting up didn't think it posted before it froze and shutdown
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Last edited by iknowmy3tables on Thu Jun 26, 2008 6:02 pm, edited 1 time in total.

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Unread postAuthor: iknowmy3tables » Thu Jun 26, 2008 4:54 pm

deleted
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Last edited by iknowmy3tables on Thu Jun 26, 2008 6:14 pm, edited 1 time in total.

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Unread postAuthor: iknowmy3tables » Thu Jun 26, 2008 5:57 pm

your lucky you got that to work, must have been the rotational momentum,
me and jack tried something similar
http://www.spudfiles.com/forums/making- ... 12899.html
its for a completely different purpose but it annoyed the crap out of us to get the thing to cycle

however there's almost no point in making a motor when you can buy an air motor, they're closely machine turbines used in impact wrenches, and a handful of pneumatic appliances, I'd still try installing an air motor eventually because it will probably be more efficient and reliable
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Unread postAuthor: STHORNE » Thu Jun 26, 2008 6:50 pm

looks very innovative. nice work, can't wait to see the finished product!
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Unread postAuthor: trollhameran » Fri Jun 27, 2008 1:16 am

iknowmy3tables: It is the momentum from the drill that makes it work in this case because without that it hangs open for along time like Jack said it it did in the thread you posted. I will look into air motors that i can buy to see if i can find one that would suit this purpose but if i cant ill work on making a better version of mine.

Thanks STHORNE much appreciated
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Unread postAuthor: trollhameran » Mon Jun 30, 2008 5:50 am

i have now started work on the new frame, and a new way of opening and closing the valve rapidly, it will be based on an old fashioned water pump but instead of the handle being pumped by hand it will be pumped by a wheel with teeth on it connected to the shaft that the barrels rotate on, each tooth will pump the arm for a separate barrel. If that doesnt make sence i will be posting pics of what i have done so far and a diagram later on today
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Unread postAuthor: iknowmy3tables » Mon Jun 30, 2008 1:50 pm

it does really make any sense, are you talking about a the classic Gatling gun hammer cocking mechanism only it's used to cock an air piston like those in airsoft guns
http://science.howstuffworks.com/machine-gun4.htm (see animation for Gatling gun)
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Unread postAuthor: trollhameran » Mon Jun 30, 2008 3:02 pm

No the force form the air being input will push the piston down allowing air to escape and then the teeth on the wheel will push the piston back up as they rotate, then when the piston reaches the top again the piston arm slides off the tooth allowing the piston to drop down again.
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Unread postAuthor: iknowmy3tables » Tue Jul 01, 2008 8:05 am

why do you have the piston powered by air , why not inject the input air into the barrel, your really going to need a diagram to explain this
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Unread postAuthor: trollhameran » Tue Jul 01, 2008 3:46 pm

the piston is powered by air because then the piston is used to rotate the barrels and the air outlet is used for firing the projectile.

I am probably scrapping this design for now though as I have thought of an extremely simple yet quite tedious way of doing it. I will post diagrams of my new design once they are drawn which should be about 20 minutes
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Unread postAuthor: SEAKING9006 » Tue Jul 01, 2008 4:06 pm

I like how for about a few weeks, it's been nothing but theories and ideas, and now, all of the sudden, everyones drawing up diagrams and planning prototypes.
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Unread postAuthor: trollhameran » Tue Jul 01, 2008 4:10 pm

lol yeah I think it might be because a fair amount of the people on this site are at school or college and were all breaking up for summer now so we have alot of time on our hands. Also alot fo the theories on here require large amounts of money to be built which is a big problem for alot of us. I have every intention of building everyone of my theories when time and money allows me to. I have a large pad of paper filled with drawings and ideas most of which havnt been posted on here yet.
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Unread postAuthor: trollhameran » Tue Jul 01, 2008 4:18 pm

here is my really simple design, the shells are loosely based on Davidvaini's pre charged shell idea, they will be belt fed into the breaches of the barrels and each barrel will have a small ramp behind it and just to the side so that when the barrels rotate the the spring loaded ram on the first pic will be pushed back by the ramp then when it reaches the end of the ramp it will fire forward into the shrader valve attached to the shells piston which will move the piston forward just enough to compress the air in the shell slightly more, and push the small diameter pipe inside the shell into the burst disc, rupturing it and shooting the projectile infront of the disc out.

Image

Image[img]

Any question? ideas? or anything else you want to say about it?

I know it will beuite tedious and possibly expensive to make alot of shells but i plan to just make one or two to start with to make sure it works and then make around 50 so that it can be shot in bursts of 50 before being reloaded[/img]
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Unread postAuthor: SEAKING9006 » Tue Jul 01, 2008 4:25 pm

I don't think a schrader will be either fast or reliable enough, because of the way you have to fill a schrader. Maybe instead, you could and push a sharp pointed spike inside the sheel forward with a small diameter air piston inside the breech face, and pop the forward burst-disk.
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Unread postAuthor: trollhameran » Tue Jul 01, 2008 4:35 pm

The shrader is only there for filling the shells, otherwise i would get rid of it, the ram will only hit the shrader because it is at the back of the shell where the piston is and pushing the shrader forward will move the piston and small diameter pipe forward to burst the disc
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