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Full Metal Launcher

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Full Metal Launcher

Unread postAuthor: Mr.Tallahassee » Thu Aug 11, 2011 11:56 pm

This is my newest finished project. The chamber is 3/4''x12'' steel pipe running through a Tee into the copper valve. The piston is hot glue with a 1/4'' thick slice of a rubber stopper as the sealing face. The barrel side of the valve is appox. 1/2'' porting through a 3/4''x1/2'' fitting adapter and into a 1/2'' threaded adapter. I may change the chamber setup with a three-way valve to use with my co2 tank and maybe a regulator. It seems to pack a monster of a punch but i have yet to test it above 80PSI.
[youtube]http://www.youtube.com/watch?v=gfhvz_ikj2g[/youtube]
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Unread postAuthor: daniel0663 » Fri Aug 12, 2011 12:44 am

Not bad :wink:
I've always found that Hot-Glue pistons were not really suitable for piston valves....
especially with certain lubricants which sort of degraded the glue and became all sticky.
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Unread postAuthor: Mr.Tallahassee » Fri Aug 12, 2011 12:58 am

Thanks! White Lithium Grease is what I used so I don't know how it will react. It seems to be doing fairly well but I'll keep an eye on it. I actually made three different pistons trying to get it right. Finally did it though. Next buy is a three-way -valve-(edit) and a HPA tank. Semi-auto! :twisted:
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 12, 2011 2:26 am

I see what you did there ;) looks promising, let's see it run!
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Unread postAuthor: nathanhd123 » Fri Aug 12, 2011 3:29 am

Nice gun. Now lets see some damage pics.
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Unread postAuthor: Mr.Tallahassee » Fri Aug 12, 2011 7:40 pm

Guy's, damage pics are delayed because my small 300PSI compressor failed on me today. It won't get above 160PSI and even then it starts to smoke. So much for 300PSI! :x Next shopping trip is for a fridge compressor. It'll have to wait for some cash flow since that flow is very restricted. :(
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Unread postAuthor: Technician1002 » Sun Aug 14, 2011 8:51 pm

Those small 12 volt emergency compressors are not up to the task of high pressure and long run times. The claims of high pressure are with the hose plugged for a few seconds. They are only intended to top off a low tire to maybe 35-45 PSI then be switched off. They were never built to fill a tire to 300 PSI. It won't run long enough to do the job and not go up in smoke.
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Unread postAuthor: Mr.Tallahassee » Sun Aug 14, 2011 9:02 pm

They most definitely are not. However, using my main 125PSI tank, I got it to pump to 180 once. I'm just going to make a hand pump for this task since I'm planning on using a 20oz CO2 bottle for a chamber at most.
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