Making a 2" Piston without O-Rings or Sheet PVC

anatov · Mon Jul 16, 2007 3:46 pm

This is kind of tricky, because I have no visual intel to show you guys. So I will use very descriptive words, bear with me...

1. First off, you're going to want to have an old inner tube from a bicycle lying around. This is the inside of the bike's tire, and can withstand a fair amount of pressure. Another item you'll want to have is a short length of 1.5 inch pipe, about 2 - 3 inches, and also two 2" or 1.5" endcaps, or sheet PVC, if you can get it it makes this a lot easier but the endcaps will work just as well. A piece of threaded rod or a bolt helps and some washers and nuts for the bolt are also required. In addition to this you're going to want to have a couple of basic tools, one of them a Dremel or rotary tool of some sort, or you can attempt to improvise.

2. Ok, you have your items, now to get to making the piston. Remember those endcaps, well if you have a Dremel you're going to have to take the straight line cutter and cut the top of the cap to get a small flat disk. Do this twice, and voila, two flat disks, it's freakin genius...

3. Next you're going to want to cut off about a 6-inch piece and then proceed to cut that piece of 6-inch tube in half along its length, producing a flat rectanglish piece of rubber. Take one of the two disks and place it upon said rectangular inner tube thingummy. Then cut around it with a razor blade, cutting tool, laser beam, whatever floats your boat. You now have a disk of rubber to go with your disk of plastic; now cut another one and punch a hole through the middle of the rubber disk as well as through the plastic disk the size of the threaded rod.

4. Next, drill four holes in a cross pattern about 3mm from the center of each plastic disk. After you do this, take your threaded bolt, and attach everything in this order from top to bottom:

Nut
Washer
Rubber disks 1+2
Plastic Disk
1.5"Pipe
Plastic Disk
Washer
Nut

After you do this, take the same inner tube from before, and cut two pieces of inner tube about 1 - 2 inches long, depending on your piston's length. Also, remember to cut one about half an inch to three-fourths of an inch longer than the other. Take the inner tube pieces and submerge them in hot water to make them more pliable and remove the white powder on the inside of the inner tube. After that, take about a foot to a foot and a half of duct tape and wrap it around the piston. Then take the previous inner tubes and stretch them over the pipe on top of the duct tape and make sure that the longer inner tube goes on last and overlaps the bottom inner tube, as well as that they both overlap the duct tape.

If anyone has any questions or doesn't understand just PM me.

e1337 · Thu Jul 26, 2007 1:23 pm

Post pics please

spud yeti · Thu Jul 26, 2007 1:48 pm

Hmmm, interesting, thank you for sharing this absolute epiphany with the world....
(btw, I chose a lazer beam to cut my inner-tube...)

anatov · Fri Jul 27, 2007 9:11 pm

Are you being sarcastic?

anatov · Fri Jul 27, 2007 9:30 pm

Not the lazer beam part, though.

Fnord · Fri Jul 27, 2007 9:47 pm

L.a.s.e.r
Light Amplification by Stimulated Emission of Radiation

You don't want Joanna see that, or she will drive to your house and eat your puppies.
(link)

Good tut, need some pictures for the noobs though

iPaintball · Fri Jul 27, 2007 9:58 pm

Why would she do that?

Fnord · Fri Jul 27, 2007 10:09 pm

I had a witty response, but I decided not to post it.

I'll just leave you guys to speculate.

Counterstriker · Wed Apr 02, 2008 5:36 pm

Sorry to kick an old topic.. But I am constructing a 2" chamber sealing gun. You say that PVC sheet is good.. Will plexiglass do any good?

anatov · Wed Apr 02, 2008 7:22 pm

Plexi could work, but I'd reinforce it with something, maybe a bit of epoxy if you can spare it, but if you can't I don't think it'd be too bad.

bigbob12345 · Wed Apr 02, 2008 7:26 pm

just a heads up, barrel sealers are easier to construct and GGDT say they yeild a little higher performance but i realize you will probably ignore this and go along with your plans

brother361 · Wed Apr 02, 2008 7:29 pm

listen to bigbob dude

Counterstriker · Wed Apr 02, 2008 7:31 pm

I know, I just want to have my own Tee valve. I finally got GGDT to work on my pc.. And got all the specs down and ready to go.

bigbob12345 · Wed Apr 02, 2008 7:33 pm

So you want your valve to be unique

I was actually thinking of making a chamber sealer for the same reason but got frustrated with the orings sealing right and just converted into a barrel sealer

Counterstriker · Wed Apr 02, 2008 7:35 pm

bigbob12345 wrote:So you want your valve to be unique
I was actually thinking of making a chamber sealer for the same reason but got frustrated with the orings sealing right and just converted into a barrel sealer

Yah, exactly! I want to just be able to say I made one, It'll make me look cool on youtube