nerf365

I found myself wanting to make a rifle. I recently got a bike pump at a garage sale, so I started with the bladder.


Materials(So far):
2, 1 and 1/2" pvc endcaps.
2 hose clamps
Bicycle innertube
Hot glue and glue gun

Take your bicycle innertube and cut out a piece with the valve on it at any length depending on how much air capacity you want.

Take a cap and stretch one end of the piece of tube almost all the way over the outer edge of the cap. Do this on both sides of the tube.

Take a clamp and put it over the cap as close as you can to the open edge of the cap without going over open tubing. Tighten the clamp as tight as you can. Use a drill if possible. Again, do this on both sides.

Put glue over the tube at the point where the tube ends at each side(on and over the cap). Do this on both sides.

Put glue over the tube on the other side of the pvc cap.

Cover the whole clamp in glue.

Pump up about 4 times and check for leaks through the glue. If you hear a leak, cover it in glue. The glue should bubble wherever the leak is.

Empty the air. Let the glue dry. Pump back up and repeat process if you hear any more leaks.

Pump it up 5 times if you don't hear any more leaks. Around the edge of where the tube begins to inflate put glue all the way around each end and let dry.

Empty the bladder and look for an open area.


This will create a perfect seal when pumped.



This Bladder is pretty ugly but will work great.(Bladder empty)


Bladder connected to pump:


Bladder full:


I'm pretty sure that if you were to use Fishin' Glue and a clamp it would most likely work just as well and look a lot better.

I'm going to continue this post with the making of a gun with the bladder as soon as possible.

I don't see this pump bursting unless you over fill it. I usually pump it about 4-5 times maybe 6. You could probably do 7, but I wouldn't push it and risk it burting on me.

I was planning on making a gun and needed a pump but I could not find anything compact enough to use as a pump. I know a little about aquarium valves and I know how spring guns work.

Materials:
4" piece of 1" pvc
2 1" pvc end caps
Hot glue and glue gun
Paper Mate 1.2 M pen(What I used.)
Aquarium check valve
2 steel washers, 1 rubber washer, 1 nut, 1 bolt
Dremal or hot knife


Pump Depressed

Pump Extended

Start with a 4" piece of 1" pvc.


Take one of the 1 " end caps and dremel or drill a hole in the center.


Take your other cap and dremel or drill a small hole in it and glue your check valve into the hole. (Make sure you can blow air through the side that is going into the cap.)


Take your nut, put a steel washer on, then the rubber washer on, then another steel washer, and then the bolt. Make sure they are all centered and tighten the bolt.



Take the ink cartridge out of the pen.


Cut at the left side of the white line.


Stock pen(top), modified pen(bottom).


Screw on the plunger setup where you cut.


Put glue all the way around the pen where the M is.


Put glue about 1/2 of an inch inside of one end of the 4" piece of pvc.


Put the plunger inside the end of the tube without glue.
Put the cap with the hole over the pen.
Put the cap with the check valve on the other end.


EDIT: I don't remember the size of the washers. I am going to the hardware store tomorrow to check it out and will post the sizes. The sizes will be in the materials list.