I think it's pronounced "NOOB." You probably should have researched first by the way. :wink: Nevertheless, here are some popular ones -Nail darts -Dowel -Batteries are supposed to work -I find chewing gum is alright -If it's schedule 40 PVC, I find that 1/4" carriage bolts pack a punch -Cast things:...

For a good sealing face, I found these washers at Home Depot with neoprene sealed to one end. When screwed onto a piston with a screw, they work magnificently, although they might need a slight bending in order to accomodate a non-linear lip and piston. If the piston isn't moving forward however, yo...

If you put a pop-off valve on the pilot, couldn't you the air firing system automatic?

...Why do you want to build a jet engine?

I'd recomend you build yourself a piston valve. They're strong, easy to open, and are the most bang for your buck.
I'd also recomend you research
Here's a great starting point:
http://www.spudfiles.com/spud_wiki/inde ... =Main_Page
Have Fun!

I hear some mice pads work as long as they aren't porous.
And do you mean a 4.5 inch barrel?

I hear on the spudwiki that schedule 40 PVC sleeved in Schedule 40 PVC works.

http://www.spudfiles.com/spud_wiki/inde ... verage_can

Cheers

Have you ever made a epoxy casting if you did you would know that taking a blowtorch to it ruins it don't use solder then a epoxy casting is present use epoxy. Well, I haven't used epoxy in it (I'm terrible with the stuff) so I used gorilla glue. But yeah, that probably won't stand up to a blowtorc...

Maybe you could try to make your own schrader valve. Gipetto's Easy Shockpump how to has a 3/4" version, and I've just made a 1/2" version of it using copper. You could open it mannualy just by pushing it open (if you can press it down hard enough) to pilot your gun. And since you seem to be able to...

Sweet! Would it be possible to switch to a piston valve though? A sprinkler valve is probably restricting the flow a little bit.
Hehe, I lol'd when the guy lost his balance from the recoil
Out of curiosity, what are you shooting?

Looks awesome! I hope you don't use a bike pump though...
I noticed in your picture it looks like you have DWV fittings there. I assume suitible high pressure fittings will be used on the real gun?

I think this happened to me. What happened was that I activated pilot, and all the air rushed out the pilot (then a blowgun.) Then just as the last of the pressure was escaping; then the piston moved back and opened, only to let out a small gust of air. A larger pilot and a better piston remedied th...

One of my friends had a friend that had a cousin that said that the naval academy was hell based on the movie Annapolis.
That's all I know.

Probably a stupid idea, but have you considered a combustion? If you hook up a regulator to a bottle, you could probably get a pretty fast rate of fire (not of course like a real paintball gun) without having to worry about CO2. Just an idea. :D Anyway, do you think you could build your own gun and ...

You didn't actually mention your budget did you? Yeah, I didn't. As awesome as the milling machines look, I'm only getting about $110 of birthday financial support (I of course can invest my own money, but don't seem to have much right now). Milling machines cost about $400 at their cheapest, so th...