Think of acrylate glues like super/gorrilla glue like velcro. they are attatched to the objects, but it is what provides the bond. With a solvent, think of it as welding, it melts the two materials, and they reform inside of eachother, so it is like one section of pipe.

Heres the linky. http://i20.photobucket.com/albums/b228/ ... AG0067.jpg

or http://i20.photobucket.com/albums/b228/ ... AG0066.jpg

Its called The FM cannon(frusturation management)

Its a 2 inch barrel sealing piston cannon.

Well the acetlyene/oxy mix doesnt create too much pressure, its how it creates it. Propane deflagrates, a steady burn over the entire mix. Oxy/Acetylene detonates, an enormus pressure spike followed by a less powerrful burn. Its the same as high explosives compared to low explosives.

Doesnt it spin when it gets out of the barrel. When i shoot anything like that it always spins the bad way.

Right after the union, im gonna bond a hinge to the inside of the barrel, and attatch a bolt or nail to the hinge, and then attatch a spring to the hinge, and i'll drill a small hole in the barrel, and attatch some cable to it, and you pull it back and let go, and it pops the union.

I feel like such an idiot, because i cant register for the SpudTech.com forums. I go to the agreement page, read the whole thing, and click agree, and the page just refreshes. WTF.

You can buy them? Oh then that makes life much easier. Thanks alot

I made a small union, but you have put the burst disk between the threads of the piping. Is this right?, or is there a better way to make a union.

Also, would a spring loaded mechanism that pops the burst disk work?

A burst disk is a piece of material that acts as a valve. It sits between the barrel and compression chamber of a simple BD cannon. When the pressure gets high enough, it rips the material, or you can send a sharp object in to do that job. I think im gonna get a spring loaded popping device to do th...

I was about to go get materials for a ballvalve cannon, but just made a mini burst disk cannon out of a 1liter gatorade bottle and bikepump(shoots AAA batteries 200 yards), and was thinking should i make a burst disk cannon or a ball valve cannon. And, how is the best way to make a burst disk union ...

I am going to be making a basic ball valve pneumatic cannon, and was wondering how i get the schrader valve to stay in the back of the compression chamber without it leaking? I was thinking epoxy right?