in an indianna style cannon there is a valve constructed from PVC shown here in the ball value construction. http://www.ntxbg.org/pgOnTheWays/SCBG_Tech/articles/articles_12.html basically i have no idea where to get the material for this from, can anyone give me a hint please?
I got mine (Grey PVC rod) from McMasterCarr. Go to www.mcmastercarr.com and search for 'PVC rod'. Carl
thanks for that. do you buy PVC from there too and machine it into a magazine or is there another way
I haven't made my magazine yet, but I will make it from PVC rod. A PVC rod is solid, a PVC tube is hollow. So you machine PVC rod to make the magazine, valve body, and end caps, and use PVC tube for the accumulator body. Hope this helps, Carl
reply i thought that would be the way to go about it. i was thinking about buying an x y table for a milling machine and fixing it to my drill press kinda a manual cnc machine
yes im speaking with my local group, i have been for a few years now just time and money were major issues until now.
cool, I just wanted to make certain as there are some restrictive laws about projectile throwers down there and I am not very familiar with them. I have dealt with Kevin, who has a set of my cannons, trying to get them approved for use down there.
yes every cannon must be from a certified builder due to safety and gun laws. however there is talk about reducing the massive short supply of cannons by using a professional fitter and turner or a shop with a cnc machine however this could greatly increase the price of cannons. i just want to understand how they are made and it may in a few months allow me to build a few demos for testing to help ease this. also we prefer to have a builder in aust as buying from the usa can get quite expensive with the dollar fluctuations and shipping
Depends. A fairly typical 1/4 cannon needs about 2-3 cubic inches per barrel, at around 120 psi to fire at around 45m/sec. There are a LOT of variables, and barrel tolerances, barrel lengths, magazine sealing, flow inside the cannon, even altitude can change the cannon's performance. It's probably better to have a largish accumulator running at a slightly lower pressure, which can be readjusted as the gun wears and efficiency drops off.
yes that makes sense so a 3 cubic inch accumulator would be ideal at around 120psi. apparently there is a new guy building cannons who emailled me recently he is just trying to get them certified at the moment. so i think i will buy cannons off him to start with
For 1/4" cannons, how long should the barrel be? I am refering to the part which would protrude from the turret.
