Auto Loader 32mm

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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velocity3x
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Fri Apr 02, 2010 4:35 pm

I posted pics in the Pneumatic Forum a couple of months ago while I was preparing to make a video. The cannon incurred a mechanical problem soon after posting the pics so, I removed them. I've spent the past month making design changes throughout and testing. These pics are of the final (almost) design.

SPECIFICATIONS:
Barrel = 1.251id x 1.75od x 72"
Ammunition = 1.250 Ball Bearing
Semi-auto
Operating Pressure = 1,000psi
Pressure system = Continuous fill.
Chamber / Barrel = 1:1
Trigger Mechanism = Pneumatic actuated ball valve, 0.630 id
Last edited by velocity3x on Fri Apr 16, 2010 10:42 pm, edited 2 times in total.
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Gun Freak
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Fri Apr 02, 2010 4:39 pm

Wow..... VIDEO PLEASE!!! NICE gun. :D
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Demon
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Fri Apr 02, 2010 4:51 pm

... INSANE ...

I love all that shiny clean solid full metal construction ...

You CAN'T skip making a video !
(I wondered why it suddendly disapered ... )
Last edited by Demon on Fri Apr 02, 2010 4:51 pm, edited 1 time in total.
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MrCrowley
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Fri Apr 02, 2010 4:51 pm

Holy crap that is nice. Your last version was good enough but you really out-did your self on this one. Yeah...we're gonna need a video too :P
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Demon
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Fri Apr 02, 2010 4:54 pm

Maybe a principe schematic ?
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velocity3x
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Fri Apr 02, 2010 5:00 pm

Demon wrote:(I wondered why it suddendly disapered ... )
Because of the minor malfunction I went into self-imposed exile! I used that time to redesign the things that I found offensive.
randompkguy
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Fri Apr 02, 2010 6:12 pm

any pics of the inner workings of that schweet arse reg you built?
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POLAND_SPUD
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Fri Apr 02, 2010 6:29 pm

why is it limited to 60rpm? due to flow requirements or because of its loading mechanism?
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velocity3x
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Fri Apr 02, 2010 7:00 pm

POLAND_SPUD wrote:why is it limited to 60rpm? due to flow requirements or because of its loading mechanism?
The rof is governed by several of things. As I recall, a 1.250 bearing weighs about 2045 grains. That's a lot of mass to move around quickly.
Last edited by velocity3x on Fri Apr 09, 2010 6:04 pm, edited 1 time in total.
thedeathofall
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Fri Apr 02, 2010 7:18 pm

Each operation has to run reliably and not crowd the next......it's all a matter of time. 60 rounds equates to about 17.5 lbs of steel down range in 1 minute. How much faster do you think it should run?
Valid point... I must ask for some velocity specs of this. Also, how do you fill the chamber? I assume, you have a scuba or HPA pump at the shop in order to reach 1000 psi per shot.
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velocity3x
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Fri Apr 02, 2010 7:39 pm

thedeathofall wrote: Also, how do you fill the chamber? I assume, you have a scuba or HPA pump at the shop in order to reach 1000 psi per shot.
No velocity specs at this time but, coming soon.
I have several size "K" cylinders of nitrogen. When the cylinders are full they contain 2500 psi (200 ft^3+). I don't have a way to refill them with hpa. When the pressure drops to low, I exchange them for full cylinder. Needless to say....rapid fire can quickly empty a type "K" cylinder.
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deathbyDWV
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Fri Apr 02, 2010 8:20 pm

That is really cool and clean. Very nice build.
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POLAND_SPUD
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Fri Apr 02, 2010 8:49 pm

but as I understand the loading mechanism and the main valve operate independently, right ? so while the loading mech loads ammo the gun can be filled at the same time... so the question is 'what takes more time ? filling or loading the next round
it's all a matter of time. 60 rounds equates to about 17.5 lbs of steel down range in 1 minute. How much faster do you think it should run
I realize that increasing the ROF is not exactly the most practical thing you one can do with a gun like this... though I would still like to know what is the most limiting factor here


what is this http://www.spudfiles.com/forums/files/p ... 13_966.jpg ?
uhmm it looks like an air cylinder but it seems it's attached to some sort of a lever... is it an air operated ball valve ?[/quote]
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MrCrowley
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Fri Apr 02, 2010 9:02 pm

POLAND_SPUD wrote: what is this http://www.spudfiles.com/forums/files/p ... 13_966.jpg ?
uhmm it looks like an air cylinder but it seems it's attached to some sort of a lever... is it an air operated ball valve ?
Trigger Mechanism = Pneumatic actuated ball valve
Looks like it :wink:
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Crna Legija
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Fri Apr 02, 2010 9:05 pm

wow :shock: that's a true beauty

lol is your rear sight a pc fan cover, looks like the old school war plane guns would have.

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