how do you find CB ratios? im building a new gun, cuz my old one had too many problems, and i want optimum power.

thanks. if i still have leaks after i let the epoxy set for a while longer, ill try this method

ok ill let the JBweld set up overnight, then start testing it at higher pressures in the morning.

so i tried to fire my gun at 25 psi, and it wouldnt fire. is there a minimum pressure that it takes to fire a coaxial piston gun?


if you guys couldn't tell by my username, and all of my questions, this is my first time building a pneumatic gun, and i do not know too much about the whole piston ...

ok thanks. i started to fill the gap, and it looks like its working pretty well. i will probaly have another question in about an hour, but i think this answers it for now.

yeah i obviously did do something wrong. is there a way to get the endcap off, and is it neccesary to remove the endcap to fix the leak? there is only really one big leak, and the rest seals very nicely. i just need to fix this one spot, and i dont feel like cutting the endcap off (again).

so i got my gun all built, barrel seals very nicely, and i got everything glued up. so i went to pressurize it, and it sprung a leak on the joint between the chamber and the end cap. i am wondering what the best way to patch up a leak is. i cant see any reason why it should be leaking, but i hear a ...

over the summer i had a job as a welder/steel fabricator. one of the guys i worked with had an oxy-acetylene cannon, and we could launch a 4 inch solid steel ball about 400 feet. before you make one of these, make sure you use 1/4 in steel pipe, with an endcap with a very strong weld. otherwise, the ...

its a neoprene seal. didnt work so well.


so the glue finally did dry, and we fired up the air compressor. everything looked good when we checked it over. so we started filling it up, and at 50-60psi, the barell came flying out of the chamber! i guess we forgot to seal the barell. whatever, the ...

i think i have it working. i just added a little bouncy ball thing to the end of the piston, and it seals really nicely. i got a 3lb resistance spring, and it seems to be holding fine. just inside waiting for the glue to set up. going to go pressure it up, and see what it does

any ideas on if the piston i built will work, or should i just start over?

i was thinking about using a bouncy ball to seal the 1.5" barrel. i saw this on some one elses spud gun, and thought it would work well. also, how big of a spring should i use?

thanks

here is the end cap, its a little burnt up, but it still functions.

here is the part of the barrel that is recessed inside the chamber.

pic of piston