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VARGAS Nitrogen (inert gas) powered cartridge gun system.

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: Gippeto » Tue Jun 29, 2010 12:02 am

Very bad ass! 8)

Staring down a 12ga is intimidating as all hell, but this...this is "need to change my shorts and kissing ashphalt in immediate submission"...the leos are gonna love it. :D

I know I do. :)
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Unread postAuthor: USGF » Tue Jun 29, 2010 12:30 am

jackssmirkingrevenge wrote:I clamoured incessantly for simplicity, and the use of commercially sized tubing, but noooo, you just had to overcomplicate things to show off what your fancy machines are capable of :P ;)

At least you ditched the original "honeycomb" design :D


JSR,

Sounds counter intuitive but when you make parts with a CNC machine, you simply load the material and "walk away". When you make stuff with tubing, epoxy, threaded joints, welding, soldering, etc, this all entails human labor. (more leak paths too)

Anymore, labor is the most expensive component of producing anything. Hence a lot of mass produced CNC parts like R/C car parts etc are really nice but pretty cheap. There is some effort in programming but once the program is proven, we simply bang out copies. You're right, still pretty cool what we can make. :D

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Unread postAuthor: jackssmirkingrevenge » Tue Jun 29, 2010 12:58 am

jagerbond wrote:engineering aside, its way too difficult to remove the material that deep with a lathe tool or a long endmill. If we decided to make it a 2 piece that would add more leak paths and milling setups associated with 2 parts. Maybe I am misunderstanding what you mean.


I'm not used to thinking in terms of CNC so my "this is how I would have made it" opinion is irrelevant in this case, because as Pete mentioned, once the machine is set and manufacturing away, the complexity factor is rendered moot.

I think JSR has already jizzed his pants at least 3 times


JSR has been jizzing his pants for several months now, as well as wearing out his fingers begging for a straight pull bolt action/semi automatic action :) imagine the clatter of those 3 inch shells! (can't really call them "cartridges" lol) though I think there are other configurations which Mike has in mind that are more practical for the task at hand.

You're right, still pretty cool what we can make.


Is property expensive in Hawaii :P :D
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Unread postAuthor: Moonbogg » Tue Jun 29, 2010 1:49 am

Thats a beautiful machine! Very impressive. I hope to get a chance to see it work.
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Unread postAuthor: inonickname » Tue Jun 29, 2010 6:23 am

JSR has been jizzing his pants for several months now, as well as wearing out his fingers begging for a straight pull bolt action/semi automatic action


That would of course be very impressive. But I'd say that once you carry a few 3" mortar rounds on the cannon, not to mention a bolt solid, wide and long enough to chamber and eject them, as well as the rest of the gun and mechanism...

It would weigh a metric shit-ton.

Impressive though.
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Unread postAuthor: dewey-1 » Tue Jun 29, 2010 2:18 pm

Mike and Pete;

Absolutely marvelous!
Happy to see your entrance into the pneumatic versions as well.

Now I see what you two have been up to for the last 6 months.
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Unread postAuthor: HunterT » Thu Aug 19, 2010 12:09 am

Very very nice indeed! :shock: I gotta learn to build stuff like this!
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Unread postAuthor: JDP12 » Thu Aug 19, 2010 7:13 am

Looks awesome! Lovin it!
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Unread postAuthor: bighead33 » Thu Aug 19, 2010 12:39 pm

it's simply a work of engineering perfection. i give it two thumbs up :D
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Unread postAuthor: jagerbond » Wed Dec 15, 2010 3:59 pm

[youtube]http://www.youtube.com/watch?v=dptkE5UZ8sM[/youtube]
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 17, 2010 6:58 am

Any progress on the multi-shot design?
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Unread postAuthor: Ragnarok » Fri Dec 17, 2010 9:24 am

It sounds like there's quite a long "lock time" between the trigger pull and firing. Is the lengthy hiss before the muzzle blast actually a delay in firing, or is the sound out of sync on the video?
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jagerbond » Fri Dec 17, 2010 2:19 pm

Ragnarok wrote:It sounds like there's quite a long "lock time" between the trigger pull and firing. Is the lengthy hiss before the muzzle blast actually a delay in firing, or is the sound out of sync on the video?


I think the noise your referring to is the pilot volume venting. We tend "squeeze" the trigger allowing it to "surprise" us with the shot so it may be the perceived delay. The piston is 2" and retracts only 3/8" so there is minimal pilot volume (1.17 cubic inches volume). When pressurized the piston differential is nearly 10 to 1 (.3 vs 3.14 inches surface area) so with both side equally pressurized, nearly the entire pilot needs venting before piston retracts.

Best,
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Unread postAuthor: jagerbond » Fri Dec 17, 2010 2:24 pm

jackssmirkingrevenge wrote:Any progress on the multi-shot design?


Not yet. What we've done so far with both NITRON and VARGAS may get us some funding... so we are working on proposals. Less play time, more paperwork. :( Hopefully they'll pay us a brazillian dollars!
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Unread postAuthor: Ragnarok » Fri Dec 17, 2010 3:05 pm

jagerbond wrote:I think the noise you're referring to is the pilot volume venting.

... really? That gives a lock time of over 150 ms.

At best, that's an irritating inconvenience that'll affect accuracy (particularly on moving targets). At worst, it's giving your target a loud sixth of a second warning.

If it really has such a long lock time, I'd say that's a major problem.
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