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Project Nerf Cocker

an electro pneumatic nerf gun...

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#1 jrbill2006

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Posted 25 June 2003 - 10:30 PM

First off I would like to grant credit to the guy who invented the front block for the autococker cocking system. Second, this design for the pneumatics was heavily influenced by the above front block

I am working on a gun that is electric, 2 solenoids, 1 open/held closed, 1 closed/held open. The open one closes a split second before the closed one opens. there is also a small chamber for the air without draining your tank. the tank is 4'' PVC with a 2 way coupler w/2 ball valves built into the coupler which will be built into the tank. One of the sides will be hooked to the gun for caonstant air, the other will be a stem valve inside an endcap to fill without unhooking your tank and so you can also close it off if you get a leak. The other ballvalve could be shut so you can take the tank off with the tank still pressurized. It would be hooked up behind the the solenoid valves but against your shoulder like a spyder via a cheap form of a bottom line hose made of heavy rubber hose.

The trigger will be homemade out of pvc and will work on electrical relay that is house right above the trigger, the batteries will be housed in an aluminum box that is use for electrical switches.

Now the pneumatics. They are still in design, but they are going to be hooked up on the back for cocking with a similar setup like the autococker, but slightly modified, These would be activated by the cocking rod hooked to the trigger, like the original. The shells are going to be ejected from the top and fed from the bottom via clip that i am going to design and keep secret. But when the bolt gets to a certain point a spring loaded flipper will eject the shell from the top and the bolt will close again putting the next shell into place.

If you havn't noticed yet im a tech junkie that loves mechanics and ballistics. Anyway coment, critique and qutestion, i still need to fine tune my plans before building. See ya.
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#2 taber man

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Posted 26 June 2003 - 08:06 AM

that plan kicks butt, and could you get a picture on the topic when you are done? just wondering. sounds awsome though!
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so this is a signature... wow, they're a lot smaller in person... o.O;

#3 p8ntballsnowman

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Posted 26 June 2003 - 01:48 PM

I think the person would be Budd Orr for the invention of the front block. Cool idea.
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#4 boltsniper

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Posted 28 June 2003 - 12:20 PM

That sounds really interesting and really ambitious. Correct me if I`m not understanding fully, but you are going to emulate a autococker paintball marker in PVC with compressed air, correct? I worked on a similar action using CO2 for a new Nerf rifle. I had moderate success until the PVC failed and the gun self destructed. The bolt slamming back and forth created incredible impact forces. I abandoned that idea for a gas operated action for my semiauto. What kind fo shells are you planning on using? I use 1/2" PVC that works fine, but I`m sure you could use many other materials. How come you are going to keep your magazine secret? The trick to a sprung magazine is to find the right spring. I used a linear coil spring...like you`d see in retail stores to push merchandise forward. The magazine I made holds 7 rounds, but the spring will allow up to around 15 rounds only the mag will be 2 feet long. A lot of careful attention and fine tuning is needed at the top of the mag to allow for only one shell to be ejected at each bolt pass rather than 2 or 3 or more. I`ve gotten mine to work quite reliably so I can assure you it is possible. Good luck with your gun. I can`t wait to see the finished product
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#5 jrbill2006

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Posted 20 August 2003 - 08:32 AM

MAny new developements have come along. I have figured out the back block setup, most of the homemande 3 way valve, the ram, and bothe the inline and front block regulator, not all are made of PVC. I am working so I can remove and upgrade stuff later. I haven't hade much expireice with brass or copper piping, but I am thinking about useing one of those for a barrel, except I want the barrel to be removable. The clip is one of those aluminum light switch boxes, but extremely modded(im not sure of the real name),It will hold around 11 shots.

Instead of having the dual solenoids, I wanted to do like a two way, for regulation. This is different than the regular auto cocker.

First off the cocking rod is longer, kind of like the 3way rod.But when it is fired forward the first inline regulated air fed valve is closed, and then the vale that will fire the gun is opened. When the ram arm, and back block come back, the process is reversed.

The tank has also been modifed, but i dont feel like explaing it, it is just much simpler and will have to be refilled every 25 rds with a foot pump, but that is a consevative estimate.

This project is coming along nicely, but will slw down slower than its already slow pace because school is being added to my plate of heaping stinking crap they call life. OUT.
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Thats the beatuy of Global History, or whatever the hell we are doing in here.
-Dr. Finan

#6 WebbZter

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Posted 20 August 2003 - 08:49 PM

I thought this visual aid might be helpful:

Autococker Animation.

It has a 3D animation of an autococker's firing sequence and a 2D animation.
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