#1
Posted 20 August 2006 - 11:37 AM
I currently have the ambition of making a 100% homemade pump gun (no store-bought valves or pumps). To jump to the point, here's what I've come up with for the valve:
As you can see, it is a rather simple design (simpler even than this one, I believe). The only real trouble would be getting the O-ring glued in place; although it wouldn't even have to be exact center. And holes would have to be drilled to the exact diameter of your firing pin, of course.
Anyways, I was wondering just whether or not an O-ring and a Neoprene washer would be able to make an airtight seal with one another. I was also thinking it might be possible to do with just a Neoprene washer, as this is what Hasbro appears to use (if you've ever looked down one of their valves).
It would of course require some lubrication; the tigher the fit, the less lubrication required.
The good thing is that the spring is in the perfect position to push the washer against the O-ring if there's no pressure to do so, so the valve will always be sealed (ever had a gun not seal until you pump it up halfway?).
Questions, comments, suggestions... anything else -- all welcome.
...and ideas are bulletproof. "
#2
Posted 20 August 2006 - 01:30 PM
Edited by Powersniper{}, 20 August 2006 - 01:30 PM.
Me- WHAT?!?!
David- Uhh... I forgot.
#3
Posted 20 August 2006 - 04:00 PM
...and ideas are bulletproof. "
#4
Posted 20 August 2006 - 05:06 PM
Your rear trigger might not work, because the pressure might push the trigger back if the seals weren't quite perfect, but the first one is a good design.
#5
Posted 20 August 2006 - 06:28 PM
The front-trigger looks alright. It would probably lose some air around the button when opened, just because of how bothersome that seal is going to be, but it shouldn't be a huge issue.
The rear-trigger, however, could be a bit of a problem. The operating rod seal would have to hold pressure perfectly, instead of just keeping the leak low.
I might look into this a bit myself. I've been looking for an air equivalent of the clothespin trigger (cheap, simple, universal, easy to build) for quite some time now.
#6
Posted 20 August 2006 - 06:56 PM
I might look into this a bit myself. I've been looking for an air equivalent of the clothespin trigger (cheap, simple, universal, easy to build) for quite some time now.
This is so easy I feel bad to explain it. Something I'm surprised no one has done.
When my brother made his first Nerf homemade, he used O-rings. It worked well, but was difficult to make. There's something easier. It's called rubber sheeting. Cut a circle of it out and it seals against PVC fairly well. You can redesign Dr. Nerf's valve to use it and construction is as easy as threading a bolt through a rubber sheet.
I'd make this myself, but I don't make Nerf homemades any longer. That and I'm poor.
#7
Posted 20 August 2006 - 09:40 PM
What were you planing on using for your valve between your homade pump and your homemade valve?
#8
Posted 21 August 2006 - 03:29 PM
threading a bolt through a rubber sheet.
I already use this for pretty much everything I can. The thing is, I want a main seal that will not leak, period, and won't need lube. For that, nothing beats two sealing faces pushing on each other.
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