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40mm Rubber Bullet gun VIDEO UPDATE

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: Hotwired » Wed May 13, 2009 4:58 pm

Something to aim for :)

Build up your engineering database, get a couple of thousand bucks and you can create your very own shiny anodised aluminium launcher.

Although to be fair, you could count on the fingers of one head the number of launchers in here engineered to this degree.
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Unread postAuthor: Ragnarok » Wed May 13, 2009 5:06 pm

Wait, what? Fingers of one head?

I'm trying to work out if you were making a bizarre metaphor or a typo.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: Hotwired » Wed May 13, 2009 10:44 pm

Well, what number do you come up with? :P


Another random thing, actually not random at all but I've noticed something:

Image

Top half of the main valve body there is clearly a bolted down plate, that makes sense to me because as far as I know you can't mill an I shaped passage in a solid block of metal very effectively.

Could either bolt together two milled T passages or mill the two parallel passages out and mill down through one of them to make the joining passage.

I'm perplexed when looking at the new version:

Image

Welded and machined off before anodising now?
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Unread postAuthor: Ragnarok » Wed May 13, 2009 11:08 pm

Hotwired wrote:Well, what number do you come up with?

Well, clearly as this exists, the number is at least one more than zero - zero of course being the number of fingers my head has attached to it.

I'm rather bewildered. I take it you are using a bizarre metaphor, but certainly not one I've ever heard before.

Also, in answer to your question, it depends on how you exactly you define "engineered to this degree". Obviously, the HyGaC20 isn't quite as mechanically complicated, but it's still certainly designed, machined and built to very high standards.

But whichever way you look at it, no, there aren't a lot...
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Unread postAuthor: Hotwired » Thu May 14, 2009 12:12 pm

There is an unsaid "other" in there.

By saying "to this degree" this is the standard to which I'm comparing others and therefore it isn't being counted.

Can barely squeak in here without declaring its duration, frequency and amplitude :P


Dammit, I was going to post something else and now I've forgotten it. Was on topic too.
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Unread postAuthor: Solar » Thu May 14, 2009 1:05 pm

The new version of the bore site manifold(the submarine conning tower looking thing) has a solid top and has a 45 degree hole bored into it that changes the direction of the flow instead of using two right angles.
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Unread postAuthor: Hotwired » Thu May 14, 2009 3:02 pm

Ah, that's another way. Cuts down on the part count and keeps the block a solid piece.

I remembered what the other thing was now.

Why would you configure it for a closed bolt?

I've been playing with some designs and I have to use a closed bolt which means it has to be magazine fed or it can't be semi automatic.

I don't actually need either of those (actually I don't want it, dratted thing can only point upwards or sideways) so I'm fiddling with a manual bolt setup.
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Unread postAuthor: Solar » Thu May 14, 2009 4:56 pm

The closed bolt would reduce motion of any mass(bolt and piston assembly) in the split second before the shot is fired. It is claimed that a closed bolt will fire more accurately, but the open bolt system works just fine for this application. As long as the bolt opens briefly you can feed it semi. Wether a blowback or with a pneumatic piston. FYI, the tube magazine will be finished tomorrow. I will take some pics before I ship it.
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Unread postAuthor: Solar » Fri May 15, 2009 3:36 am

I posted a link in my original post as well.

http://s16.photobucket.com/albums/b12/s ... n002-1.flv
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Unread postAuthor: Ragnarok » Fri May 15, 2009 8:56 am

Well, if no-one else is going to comment...

It looks impressive. It'd obviously be great to see how it works with a magazine rather than single shots, but you can't deny that it does work.
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Unread postAuthor: CpTn_lAw » Fri May 15, 2009 9:07 am

I agree, it's a nice piece of work you made there, and it's accurate! where do you get your rubber balls? I mean, are they boucing balls? Nice to see the actual action of the gun, nice little vapor cloud ^^
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Unread postAuthor: Solar » Fri May 15, 2009 12:45 pm

They are dog toys from http://www.petco.com .Search for "toy buddies mini tennis balls" on their site.

I should have the magazine parts back from the shop today. Will post another vid of the test later.
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Unread postAuthor: Hotwired » Fri May 15, 2009 2:06 pm

External moving parts make things more interesting somehow ^^

I didn't think the ram would operate that fast, been a while since I last saw one at work.

Very nice.
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Unread postAuthor: daniel323 » Fri May 15, 2009 4:33 pm

gun looks very impressive firing

it would be awesome in paintball!
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Unread postAuthor: Solar » Fri May 15, 2009 5:25 pm

Scored the perfect spring for the magazine today out of a CAR butt stock kit from CAA. Had to buy the whole damn thing, but the magazine will work much better. Should be done in about an hour or so.
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