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Unread postAuthor: jackssmirkingrevenge » Wed Apr 15, 2009 7:32 am

SPG wrote:I regularly use syringes recreationally*, does this make me insane?


There's recreation and recreation ;) you can actually make an effective launcher with a 1mL syringe and separate needle, just stick the needle into a bar of soap to block it and then attach it to the syringe, press the plugner and pow, instant dart gun.

In the T-piece have you got any kind of "hop-up"/similar to prevent the BBs rolling out the barrel?


In this case no, the mag is for pellets and they don't need to be held in.

If so what about an inline magazine? Basically just a barrel extension running rearwards from the T-piece, with the air from your valve coming up the T instead so that it enters between the first two BBs?


Like this?

Image

I remember you proposing the idea back on spudtech, I had forgotten about it but now that you mention it, it might be just the sort of system that will work well for my upcoming high pressure variation :)
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Unread postAuthor: Ragnarok » Wed Apr 15, 2009 7:51 am

jackssmirkingrevenge wrote:I don't nick them, I borrow them on a permanent basis ;)

Yes... because I haven't used the phrase "Borrowed indefinitely without permission" myself more than once.

Warning: Link heads to TV Tropes. The site is like Pringles turned up to eleven - after you start, you can never stop reading it. EVER.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: SPG » Wed Apr 15, 2009 9:28 am

jackssmirkingrevenge wrote:There's recreation and recreation ;)

And there's procreation, oh wait, that's a turkey baster isn't it?

jackssmirkingrevenge wrote:Like this?

Image

I remember you proposing the idea back on spudtech, I had forgotten about it but now that you mention it, it might be just the sort of system that will work well for my upcoming high pressure variation :)


That's exactly it, I just couldn't be bothered to draw it. I imagine you could use a commercially bought hop up for the same thing, but why bother when you can make it? If you could get a reasonable seal behind a magazine follower you could even have the mag airsprung. And if you were planning on making this thing vaguely rifle-like then the magazine itself could go in the stock. I wonder if there's a way to make it detachable, quick release maybe?

PS. As an aside, I'm finding it interesting to see a convergance between repeaters and valved hybrids, this whole set up would work just as well hybridised.
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Unread postAuthor: psycix » Wed Apr 15, 2009 10:15 am

jackssmirkingrevenge wrote:
psycix wrote:So I also did it with a simple T...
I can tell you, results were pleasing...


Then show us! yeeesh! You're the biggest tease I know, and you don't even have breasts!

:roll: :D

Check my thread or youtube channel. :)



@the latest diagram
Maybe that making one little tiny hole in the back of the magazine helps to prevent doublefeeding. The tiny leak will ensure that the pressure behind the ammo is always less then that in front of it, pushing the bb's back during the shot.
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Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

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Unread postAuthor: SPG » Wed Apr 15, 2009 11:56 am

If you wanted to be really flash you could throw in a little pop-up bolt like this:

Image

EDIT: Click HERE to see it again, and then just refresh till you're bored.

EDIT: no don't bother, see below
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Last edited by SPG on Wed Apr 15, 2009 1:31 pm, edited 1 time in total.
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Unread postAuthor: psycix » Wed Apr 15, 2009 1:18 pm

Ooh me likey. Will get hard in practice though. Maybe it should pop up in a cross piece.

Oh your refresh trick doesnt work :(
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Unread postAuthor: Fnord » Wed Apr 15, 2009 8:09 pm

Oh your refresh trick doesnt work

Hitting ctrl+f5 (or whatever your browsers "forced refresh" is; look it up) will work.
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 15, 2009 11:55 pm

The pop-up bolt adds unnecessary complexity, if you're going to go through the trouble might as well make a blow-forward valve.
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Unread postAuthor: Skywalker » Thu Apr 16, 2009 8:37 am

Jack! Woohoo! You finally made the stinking pop-off gun work! Way to go! :D And it turns out the extra complication of the linkage from the piston to a valve at the inlet to the firing chamber was unnecessary, huh? (That is, the blowgun doesn't overwhelm the valve and make it fart/stick open.) That's nice.

I'm tempted to try building one in steel for 1/4" steel slingshot ammo and 300-400psi... I'm a bit short on cash and time a.t.m., though.

Here's my take on how to load the ammo:

Image

Pop-up bolt?!? Now we've thought of everything! lol.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 16, 2009 12:24 pm

Skywalker wrote:Jack! Woohoo! You finally made the stinking pop-off gun work! Way to go! :D And it turns out the extra complication of the linkage from the piston to a valve at the inlet to the firing chamber was unnecessary, huh? (That is, the blowgun doesn't overwhelm the valve and make it fart/stick open.) That's nice.


Thanks :)

The critical parameters to stop it hanging were having the valve outlet open even when the piston had moved just a fraction, as well as having the piston seat bigger than the outlet.
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Unread postAuthor: Copperboy » Fri Apr 17, 2009 4:39 am

Congrats Jack! Awesome sound it makes! Fnord had an interesting layout a few pages back (think it was nr 3), that haven't really been discussed. It seems to meet the criterias for it not to hang. What do you guys think?
Again nicely done!
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 17, 2009 4:52 am

Thanks :)

Copperboy wrote:Fnord had an interesting layout a few pages back (think it was nr 3), that haven't really been discussed. It seems to meet the criterias for it not to hang. What do you guys think?


This one?

Image

It has a lot of dead space, apparently Fnord has been doing some experimenting in the meantime though which I'm sure he'll share eventually :)

In the meatime, my third version of this valve for use with the HPA tank (850 psi :twisted: ) is finally complete and ridiculously overengineered, I'll have a play with it when the epoxy cures and give you the results, keep watching this space ;)
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Unread postAuthor: SPG » Fri Apr 17, 2009 5:10 am

JACK !!!!!! I can't believe you said that, surely you could just fill a lot of the deadspace with epoxy.
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Unread postAuthor: psycix » Fri Apr 17, 2009 5:30 am

keep watching this space ;)

Or fill it up with epoxy like the one in the above diagram.

Cant wait to see it! Dont dare to fail now! :wink:
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 17, 2009 6:36 am

psycix wrote:Cant wait to see it! Dont dare to fail now! :wink:


Too late :(

Image

No pop-pop-pop, just a fish with no eyes.

Dammit.

Similar thing happened with my attempt at a pop-off piloted piston with a very small chamber - maybe it does need an expansion chamber after all, hmmm...
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