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RR Assisted Bolt Action

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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RR Assisted Bolt Action

Unread postAuthor: PVC Arsenal 17 » Thu Jul 22, 2010 10:15 pm

Copied from my post on NerfHaven:


Here's something I put together over the last few days, still far from finished but as of now it's in a functioning state.

Image

This blaster was designed for taking out long range targets in Humans Vs. Zombies, NOT nerf wars.

It uses what I call "assisted bolt-action." It's best described as the halfway point between bolt-action and semi-automatic. A fraction of a second after firing, the bolt opens. Due to the non-resetting trigger, the bolt stays open to allow the player to load a new dart. The trigger is then manually reset by pushing it forward which in turn closes the bolt and advances the dart. Because the action of pulling and manually resetting the trigger is so minimal compared to cycling a bolt, I call the process "assisted". The player never manipulates the bolt directly, only the trigger valve.

As you can see I have yet to install the actual trigger to the valve, but that'll be done soon. I still have to clean it all up a bit and then give it a healthy makeover with bright colored duct tape so it looks ridiculous as a nerf blaster should. More to come...
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Last edited by PVC Arsenal 17 on Sat Jul 24, 2010 12:19 am, edited 1 time in total.

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Unread postAuthor: Lockednloaded » Thu Jul 22, 2010 10:43 pm

awesome gun you got there! I like all your nerf guns, but its a shame you don't build a whole lot of destructive guns these days..

The loading mech is kind of iffy, don't you have to keep the trigger pulled until you load another round. That sounds kind of awkward

thats an air cylinder in the back right?
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Unread postAuthor: PVC Arsenal 17 » Thu Jul 22, 2010 10:52 pm

Thanks for the reply.

Yeah the air cylinder is housed in there. The sleeve valve does not have a spring to reset itself so once you pull the trigger you can let go and do whatever and the bolt will remain open.
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Unread postAuthor: Clarke » Thu Jul 22, 2010 11:06 pm

Wow if this thing was all metal or had a paint job instead of the white PVC it would look a lot better. Great gun either way, what valve are you using as a pilot ?
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Unread postAuthor: PVC Arsenal 17 » Thu Jul 22, 2010 11:18 pm

The pilot is an 1/8" sleeve valve.

PVC was chosen because it's cheap, light, and easy as hell to work with. It'll look absurd by the time I'm done with it, which is the point. It cannot look threatening. Most of the exposed metal will be taped over in blaze orange or neon green.
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Unread postAuthor: Clarke » Fri Jul 23, 2010 12:29 am

I thought the red sleeve infron of the handle was a slide valve, good choice. I dont see how PVC is less threatening than metal :?
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Unread postAuthor: PVC Arsenal 17 » Fri Jul 23, 2010 12:59 am

Slide valve, sleeve valve, same thing.

Here it as after being duct taped up.

Image

Pretty ridiculous right? I think so.

A different color grip will be molded and the tank will be covered in something colorful.
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Unread postAuthor: blind909 » Fri Jul 23, 2010 2:41 am

Thats pretty cool, looks like it was painted, great use of duct tapee, i did the same to my homemade airsoft rifle with some acu duct tape.
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Unread postAuthor: Clarke » Fri Jul 23, 2010 3:22 am

ok i retract my statement lol but nice setup anyways buddy
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Unread postAuthor: Gaderelguitarist » Fri Jul 23, 2010 8:09 am

I would love to see this thing covered in a thermoformed plastic shell. Something bright like your tape, yet somewhat blaster-like.
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Unread postAuthor: PVC Arsenal 17 » Sat Jul 24, 2010 12:19 am

I'd love to do something like that if it wasn't such a pain. It would certainly add some strength to the gun to protect it from falls. It's pretty solid, though. If anything is going to break I expect it to be the barrel. (Which has been shortened since the pictures were taken)
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Re: RR Assisted Bolt Action

Unread postAuthor: jackssmirkingrevenge » Sat Jul 24, 2010 12:44 am

PVC Arsenal 17 wrote:It uses what I call "assisted bolt-action." It's best described as the halfway point between bolt-action and semi-automatic. A fraction of a second after firing, the bolt opens. Due to the non-resetting trigger, the bolt stays open to allow the player to load a new dart. The trigger is then manually reset by pushing it forward which in turn closes the bolt and advances the dart. Because the action of pulling and manually resetting the trigger is so minimal compared to cycling a bolt, I call the process "assisted". The player never manipulates the bolt directly, only the trigger valve.


Sounds vaguely like the PTRD :)
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Re: RR Assisted Bolt Action

Unread postAuthor: PVC Arsenal 17 » Sat Jul 24, 2010 8:49 pm

jackssmirkingrevenge wrote:Sounds vaguely like the PTRD :)


That's genius.


Here's a picture showing how I worked out the trigger as well as what would have been the new grip...

Image

Word to the wise: stay away from Sculpey III modeling clay. That stuff is horrible.

The trigger is a thin bolt hoseclamped to the sleeve valve. The flat top part of the hose clamp runs along a section of aluminum u-channel to prevent the assembly from rotating. Pretty damn solid.

And two videos demonstrating the action in case my explanation was unclear:
http://s237.photobucket.com/albums/ff15 ... 002124.mp4
http://s237.photobucket.com/albums/ff15 ... 002125.mp4

Excuse the quality... cell phone camera.
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Unread postAuthor: Lockednloaded » Sun Jul 25, 2010 1:06 am

now I really understand the loading, doesn't seem so bad. I might even use this for a cartridge feeding gun.. thanks for getting my ideas flowing :idea:

PS
Where'd you get that co2 reg from?
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Unread postAuthor: jhalek90 » Sun Jul 25, 2010 11:11 am

very nice. What pressure was the video at? seems like 20-30.

On a side note, try and get some PEGT plastic pipe... it fits the streamlined nerf darts, as well as home made darts perfect, and it nests in 1/2 pvc.

You could simply slide a piece in your barrel, use homemade darts or streamlines , and remove it when you need to fire suction cup darts or taggers.

It may be possible for me to mail you some for the cost of postage.

How long is your barrel?
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