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Nerf Gau-19

scratch built Gatlin Gun

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#1 StrmCkr

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Posted 12 April 2020 - 08:01 PM

this is a long time project that has sat in my cad design phase for the better part of 6 years, with all the free time now applicable to me

i finally decided to bring the concept to life

 

this build is based on the real world Gau-19 ,

the reason i have chosen this is from the limitation of rotating air chambers adding extra chambers increases space by a lot, three barrels is the easiest to work with. 

 

this gun's internals for air chamber is based off the Nerf Long shot as dimensions are easy to attain online with out gutting my first edition, and working components are cheap and easy to effectively acquire. {springs,seals} 

 

this build features a unique brass breach brass breach lower half.PNG

 

all components are 3d printed and designed in cad. gau-19.PNG

 

this will be a DC powered device that uses air pressure to launch darts.

 

 a work in progress and this post is where i am at with the build so far.

 

Barrel:

3 barrel setup.PNG

3 barrel with race test fit.PNG

brass breach lower half.PNG

 

Bearing Races:

race lock ring.PNG

race with bearings.PNG

race locked ring test fit.PNG

airchamber with front race and gear ring.PNG

rear race on back plate.PNG

airchamber race with bearings.PNG

 

Air Chamber:

air chamber.PNG

air chamber with gear+ back plate.PNG

air chamber back seal.PNG

 

Piston:

piston rods and rams.PNG

 

Breach support:

support column.PNG

 

Breach Spring slide guides :

breach sping slides.PNG

test fit.PNG

 

Attached Thumbnails

  • back plate test fit.PNG

Edited by StrmCkr, 12 April 2020 - 08:09 PM.

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#2 snakerbot

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Posted 16 April 2020 - 12:44 AM

This is too mechanically complicated for my tastes, but I love that it's being attempted. Good luck!

 

Are you printing the plunger tubes? Did you insert anything in them to serve as the tube itself, or are you expecting the printed surface to work?

 

How are you planning on loading darts into the breeches as everything moves?


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#3 StrmCkr

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Posted 17 April 2020 - 02:22 PM

This is too mechanically complicated for my tastes, but I love that it's being attempted. Good luck!

 

Thanks.

yes its a bit mechanical, which is why it sat on cad for a long time had some issues sorting out how to get the gun to prime the air chambers easily without a heavy gear system found a simplified solution and set to work on bringing it to life. 

 

since this is a concept demo piece:

 

Are you printing the plunger tubes?

 

yes its these: http://nerfhaven.com...-1586739115.png

 

Did you insert anything in them to serve as the tube itself,

 

 - no i do not have anything inserted into them atm, they are water tight and hold air pressure: if they do fail then ill looking at acquiring aluminum inserts for the Nerf long shot and install 3, or custom fab them from aluminum tubing depending on whats easier to acquire and cost

 

      what i am planning on doing is  using a 36MM ring slightly heated and pressed through the tubes to fix the uneven internal surface caused by printing

 

or are you expecting the printed surface to work?

 after fixing the internal surface to smooth  then i expect them to function to a point:  surface friction if it exceeds 180 C will deform them --  mitigation by slowing the rotational speed down and sufficient air flow

 

How are you planning on loading darts into the breeches as everything moves?

 

i have 2 plans: 

  a pressure feed cassette aligned to dead center on the bottom of the gun{feed off the side of the gun}: 

the breech mechanism picks up a dart as the system rotates {the black slot rails hold a spring loaded breach slide that moves with rotation}

 

if that wont work i'm looking at a timed rotating system that brings a dart off the cassette and aligns it right to the breach then the breach grabs it

 

the cassette  its self  adapted to clips/drums for testing when it works

 

project 2 kicks off cad files

          a linear link-less back pack  holding 1k-2k rounds. :ph34r:


Edited by StrmCkr, 17 April 2020 - 06:40 PM.

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#4 snakerbot

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Posted 19 April 2020 - 12:18 PM


 - no i do not have anything inserted into them atm, they are water tight and hold air pressure: if they do fail then ill looking at acquiring aluminum inserts for the Nerf long shot and install 3, or custom fab them from aluminum tubing depending on whats easier to acquire and cost

 

      what i am planning on doing is  using a 36MM ring slightly heated and pressed through the tubes to fix the uneven internal surface caused by printing

 

or are you expecting the printed surface to work?

 

 

I'm less worried about pressure/airtightness at these low pressures than I am about smoothness. I'd recommend using some tubing stock - aluminum like you mentioned, or polycarbonate, or PETG, or something.

 


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