Yeah i'm in Australia. The sizes and types of pipe that i can buy around me are very limited. Very expensive here too. The highest pressure i went to with this thing was about 1400 kpa. The battery i was using with tape wraped around it was destroyed. Now i am using a large screw/bolt/something with...

Yay iv'e built my first gun. Name: "AA" 56 Type of cannon: Pnuematic Chamber size: [2 5/32" X 15"] [CI: 56 cubic inches] Barrel size: [11/16" X 27"] [CI: 29.2 cubic inches] Gas source: Compressed air Valve: Simple ol' ball valve for the trigger and a schrader valve for filling http://203.161.71.70/a...

Can't belive i didn't think of a rubber seal.

Thanks for the quick replies.

For my chamber iv'e got a t piece coming out that reduces to a 0.5" / 15mm end cap where i'm going to put the pressure gauge. I have all the parts but i don't know how to make a good seal around the gauge.

If anyone could give me some tips that would be great.

Heh i'm gonna pump it to 200 psi anyway.

What are those metal clips you use on the front of the mini pneumatic to keep the barrel still and those two on your other cannon called?

Those look awsome.

I don't see why not, the pressure ratings on those pipes are like 300+ so i would think 180 psi is safe enough.

Does it get more dangerous as the chambers get larger?

Yeah i want to get to around 200, i'll make sure to get a metal one then.

Probably be very hard going over 100 psi with a bike pump.

Hi everybody.

Does anyone know how much pressure a schrader valve can take before breaking? I am planning to use one with a small pneumatic spud gun to be pumped up by a regular bike pump.

Thanks.