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TFS-Semi (Preview)

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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TFS-Semi (Preview)

Unread postAuthor: PVC Arsenal 17 » Sun Aug 23, 2009 2:31 pm

Just something I've been working on lately (unfinished):

Image

Image

Video demonstrating a single shot with shell ejection.


You can follow the original thread at NerfHaven here.

It's a Nerf gun btw.
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Unread postAuthor: POLAND_SPUD » Sun Aug 23, 2009 3:11 pm

wow I am impressed...
I like the way you attached the air cylinder...

could you post more pics (possibly showing internals) ?
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Unread postAuthor: PVC Arsenal 17 » Sun Aug 23, 2009 5:13 pm

Here are all the parts before they were installed in the gun:

Image

Image
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Unread postAuthor: twizi » Sun Aug 23, 2009 6:37 pm

looks great but how was that 200$ what the brass tee bellow the acuwater
a mini qev?from a paintball gun?
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Unread postAuthor: btrettel » Sun Aug 23, 2009 7:24 pm

It's really a masterpiece of simplicity. I love it and likely will steal many ideas for FANG from it.

Is there any reason the air cylinder isn't on top? When I was considering a similar arrangement (not quiet the same as I didn't think the tiny Clippard QEVs were adequate) I did it that way.

Are the PVC tubes a McMaster-Carr item (for example, something like 85095K91)?

I'd also like to say yours is yet another criminally unnoticed thread at NerfHaven. I'm almost convinced that they have their idols and are sticking to them regardless of what others produce.
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Unread postAuthor: PVC Arsenal 17 » Sun Aug 23, 2009 7:46 pm

@twizi: I suppose I exaggerated on the price, but not by a whole lot. I wasted a of lot money building this, it could have done cheaper. The QEV is made by Clippard, model #JEV-F2F2.

@btrettel: Thanks again for your compliments. I kept the cylinder on the side because I wanted the shells to feed from the bottom and eject from the opposite side, and of course to leave room on top for unnecessary iron sights and other nonsense add-ons.

Very close with the part # on the PVC tubes. :wink:

As far as Nerf Haven, yeah, I think you're right. The few that posted in my thread did seem impressed though. Only a couple had anything intelligent to say, but I'm not gonna mock them. There's a lot of young kids on there, you can't expect them to say a whole lot. I really just felt like sharing my progress with someone.

Simple as it may be, I'm disappointed that I didn't really achieve my goal. I wanted this thing to be easy to make. It wasn't horrible, but it's not something the average nerfer could just throw together with simple tools, and that's what I was trying to pull off.
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Unread postAuthor: inonickname » Sun Aug 23, 2009 8:33 pm

This is a nerf forum.

Duhh man don't post such non nerf stuff on a nerf forum!
I lold.

It looks very nice.. I'm still looking for a use for my QEV, so it may go into a nice nerf gun.. But I still need to find suitable darts/barrel.
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Unread postAuthor: twizi » Mon Aug 24, 2009 3:43 pm

how does the qev pilot is ther a leak somewhere?
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Unread postAuthor: POLAND_SPUD » Mon Aug 24, 2009 4:39 pm

how does the qev pilot is ther a leak somewhere?

what you say ? :wink:

well my guess is that you want to know how it works, right ? well technically it's just like FANG or my semi auto...
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Unread postAuthor: PVC Arsenal 17 » Mon Aug 24, 2009 5:48 pm

The way the QEV pilots is nothing new. It's very simple. It's connected to a 3-way, normally open valve. At rest, air flows through the valve to the QEV. When you pull the trigger, the valve shuts off the incoming air supply while at the same time venting the air behind the QEV, piloting it.
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Unread postAuthor: pizlo » Mon Aug 24, 2009 8:04 pm

oh man I lvoe this! I've always wanted to do something like this but I dont have the skills.
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Unread postAuthor: btrettel » Mon Aug 24, 2009 8:26 pm

I hadn't considered that you might be using any sort of sights. With that in mind the air cylinder would work best on the side.

To anyone who doesn't understand how the valve system here works look at the images below for a test gun I made about a year ago.

Image

Above is the gun without the trigger depressed. The gas chamber is filled during this stage.

Image

With the trigger pressed the QEV is piloted (which in turn fires the dart) and air flow from the gas reservoir is stopped.

It's a simple way to get semi-automatic operation from piloted valves. In PVC Arsenal's gun the air is piloted out of the holes on the side of the valve. The valve he's using is very good for this purpose as it doesn't have a bulky extra port like the one in my images here.
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Unread postAuthor: PVC Arsenal 17 » Thu Aug 27, 2009 3:39 pm

I made some shells out of 5/8" O.D. steel (.527" bore). They are heavier than my PETG shells and that's a drawback because it adds more to the overall weight of the gun, but I don't mind. The fact that they're steel means I can use small magnets to hold them inside the gun securely until the gun ejects them.
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 15, 2010 12:56 am

I had missed this one, a little complex for what I like to aim for but looking very good, kudos!
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Unread postAuthor: Crna Legija » Mon Feb 15, 2010 1:14 am

wow nice gun iv wanted to make something just like it, how big is the qev?

man nerfhaven really bichy about sp
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