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Rifle based ETG

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LAN_403

Killa-X

Sun Mar 13 2011, 01:28AM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

I thought I might as well start sharing my project, and progress as I go.

* Capacitor Bank: 450V 9600uF for roughly 980J of power
(May hook it for 900V, not sure)

* 800V 350A Stud Diode
* 1200V 650A SCR (I want a STUD)

So. The scope of my project, I wanted to make a Rifle based ETG. That way I have a barrel which will give the projectile enough time to accelerate. In the past, I did PVC pipe. 12 inches long. I manage to shoot a flash capacitor through the bottom of a soda can. The next shot exploded the PVC plastic adapter. Due to this, I moved to solid steel tubing. This is 4mm thick steel pipe, with a threaded endcap. Weakest point, the threads. 1KJ should be fine for this system. JUST IN CASE it explodes, I understand metal is lethal at high speeds. I am placing the endcap inside a 2" diameter 4mm thick steel tube. The side facing me, the gun holder, will have a 1/2" steel plate welded to the pipe. So, my PVC system had a lot of leaks. This is air tight. It should shoot a LOT better.

Now. Why am I making an ETG? Obviously not to do harm to life (people..animals..etc). The reason I'm making an ETG is for three things.

1) To have it as a proof of concept
2) To present it to my electrical teacher, Showing how you can make a gun with capacitors and foil (points to number 1)
3) To mess around with, meaning to shoot it at targets, just like someone does with a spud gun.

I understand the dangers of weapons, and rules against making such things. I am one who takes saftey as a priority, and design things so when stuff goes wrong, I'm safe. I also tend to enjoy putting way too much money into looks. I'm even buying a full metal 1:1 scale replica of a handgun for a handle =)

PICTURES!

* Barrel with capacitors

* Muzzle for looks (Sound dampening too)

* Protection pipe to shield myself in case of explosion

* Test design front view

* Cad design (The stock sucks, I know, I'm still working on it

Let me know what you think! Will update as things are made.

[Edit: F. Any images you include in your post must be less than 400 pixels wide. If the image is too large, link to it with a URL tag rather than actually embedding it with an IMG tag. If it's something you intend to attach to a post, the board will automatically resize it for you, and create a link to the full-size image. Offending images may be removed at any time -- if you post oversized images, don't be surprised or angry if you find all your images deleted. ]

HazzWold 1993

Sun Mar 13 2011, 09:59PM

Registered Member #2563 Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280

None of your pictures show up for me :(

Killa-X

Sun Mar 13 2011, 11:13PM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

HazzWold 1993 wrote ...

None of your pictures show up for me :(

On some kind of mobile? They are just imageshack..Usually works fine in any location you got internet...

HazzWold 1993

Sun Mar 13 2011, 11:41PM

Registered Member #2563 Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280

At a library, on Windows 7, IE8..

Killa-X

Mon Mar 14 2011, 02:47AM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

Ah. Weird they block sites probably I guess. Maybe at home you can view it fine hopefully.

Well, I did some tests today and it failed. I was able to blow the projectile out of the barrel at a slow rate with little breath, or fast with lots of breath. When i did 400J, nothing came out. So...I think the issue was the wire. I made this quick with what i had, 20awg wire. Before you go OMG REALLY?! ON 1KJ?!?!?!?! Yeah. I know. But it last 3 shots, and the contacts (touching the foil) was all gone.

I'm hoping the gun sucked DUE to the contacts evaporating. And that it works better when i get 12awg. Hopefully!!!

HazzWold 1993

Mon Mar 14 2011, 06:56AM

Registered Member #2563 Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280

I can see it now! at home.. btw nice work!

cedric

Wed Mar 16 2011, 09:24AM

Registered Member #2941 Joined: Fri Jun 25 2010, 08:08AM
Location:
Posts: 143

the coil is around the iron barrel ?!!

Electroholic

Wed Mar 16 2011, 10:22AM

Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720

I'm in the middle east, and the pix are not working for me.
Try imgur next time.

Patrick

Wed Mar 16 2011, 10:23PM

Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639

OOooooo! Killa-x nice work! I need one of these, I even have an pellet rifle plastic grip-stock from a dead weapon. I will repurpose it for this device.

EDIT: I could be persuaded to part with 8 of my 50RIA60 (600V) SCR's. not sure if they meet your specs though.

EDIT: The pics show up fine for me.

Killa-X

Wed Mar 16 2011, 11:16PM

Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039

cedric wrote ...

the coil is around the iron barrel ?!!

Its an ETG. Electrothermal, shoots with plasma by evaporating foil with high capacitance.

Well I need to buy a new barrel because a weld seem down the inside of the barrel is causing issues. I got something in mind but no idea if regular plumbing parts will fit on conduit...The thick wall threaded ones

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