Posted 10 May 2006 - 03:48 PM
Posted 10 May 2006 - 04:32 PM
The pump is very easy to construct, but it lacks a major thing. It is missing check valves. A good pump should have two, one for input and one for output. An input check valve could be emulated by a hole that is drilled into the pump body at a point just before the end of the pump stroke (so that it can intake air when the pump is retracted). The output check valve would connect the pump to that gun. Its purpose is to keep the air inside of the pressure chamber.
Does your gun have an "output" check valve as described above? If it does not, it may not keep pressure at all.
While trying to build my new homemade gun I found out that my ball pump I bought won't be able to withstand all the pressure when pumped up to so many psi.
Posted 10 May 2006 - 05:23 PM
Edited by schoute1587, 10 May 2006 - 05:24 PM.
Posted 10 May 2006 - 06:28 PM
1: Don't use a ball pump. Instead, buy a handheld bike pump from walgreens, the kind that has an extension hose that screws on to the end. Cut the end off this extension hose, and put in a hosebarb. Tap the hosebarb into your chamber wall, and you have a nice and sturdy pump connection.
2: Aren't the ends of ball pumps threaded? See if you can find a nipple that fits these these threads, and tap that into the chamber wall.
A homemade pump would probably be better, but I like storebought ones because of how slick, compact, and cheap they are.
Posted 11 May 2006 - 05:28 PM
Posted 11 May 2006 - 08:32 PM
So, the thing I think I'm missing is: you use a one-way valve, right? Lets air in but not out? And even then: you shouldn't be able to draw out the pump shaft, because that would create a vacuum.
I'm so confused. Anyways, if there's something obvious I'm missing, then... well I guess I'm dumb. But I'd still like to know how it works. Thanks to anyone who helps.
...and ideas are bulletproof. "
Posted 11 May 2006 - 10:22 PM
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