I started with the hose handle.
Make sure it is threaded at BOTH ends. I picked mine up at Lowe’s a while back, and never did much with it. We’ll be using this baby in strange and unusual ways. I glued a bit of 1” thinwall over the front of the handle. We’ll be flipping it around, so as to get rid of the annoying angle often produced by these things. In the former bottom of the hose handle, which will be at the top of the gun, screw a ½”x3/4” adapter that has been cut down and wrapped in Teflon tape like so. It will be attached to the central T by a stub of pvc.
The airtank is a 1 ½’ pvc coupler; in one end is a plug, and in the other is a 1 ½”x3/4” slip/thread bushing.
Wrap the former front end of the hose handle in Teflon tape, and screw it in—but not before you drill a hole in the side of the tank and add about 8-10” of vinyl tubing. Drill a hole, jam in the tubing, and cover the whole thing in epoxy putty.
As for the pump, I used a $5 ball pump from Wal-Mart. I drilled a hole in a cpvc endcap, jammed my tubing through it, then covered it in epoxy putty. However, the putty failed to hold the cap to the end of the pump, so I covered the end of the pump in hot glue and seated the epoxy (which had been pressed flat against the end of the pump) into it. Presto--perfect seal.
Here we can see how this thing is coming together...
In order to get around the common problem with homemade airguns—too much air volume, leading to long pump times and too much power—I designed this thing around a 9" RSCB assembly, which holds 6 darts. The clip is surrounded by a bit of 1” thinwall, which is held to the central T by a screw, and the stock is glued onto this piece, as is the pump (mounted on the side).
I didn’t have any suitable barrel material handy, so I tested it using a foot of cpvc. It shoots almost as hard as my SNAPbow. With a little brass/petg, this thing should be like a 6-shot, sexy-lookin’ Big Blast. Due to the single check valve and large- diameter pump, it’s bloody hard to pump—2 good strokes is all I can manage (I’m 6’ tall, 200lb., and work for a living), which serves as a sort of OPV; it has plenty of volume, but you can’t pressurize it enough to make it dangerous.
Gun porn. Here it is with a SNAPbow and a NF. Little fella, eh?
In response to the plethora of Ancient God naming practices on these boards, I dub this gun...
The PixieBlast 9000. Enjoy.
This post has been edited by rork: 02 December 2008 - 09:59 PM