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Design on a Coaxial Piston Cannon

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Gippeto » Fri Aug 26, 2011 9:47 am

Your machinist should be familiar with it. It's basically a pipe without a seam. Some varietys are used to make things like hydraulic cylinders...these tubes have a precision bore. :wink:

Can be heavy, but you're not building a "light weight" anyway. :)
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Unread postAuthor: saefroch » Fri Aug 26, 2011 10:41 am

Oh lord... we've been over this SOOOO many times before. Don't worry about a lighter piston versus a heavier piston's bumper requirements. Just remember that a lighter piston opens faster and therefore offers better performance.
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Unread postAuthor: Atattack » Fri Aug 26, 2011 12:08 pm

I went today to machine shop and had him make it to same specs as JSR had in his pic. Hoping they get it done today so I can put it together this weekend. Will keep you guys up to date.
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Unread postAuthor: Moonbogg » Fri Aug 26, 2011 2:41 pm

Its your baby now JSR. You bought it! :lol:
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 26, 2011 3:26 pm

I feel somehow responsible for this launchers' success now :? :D did you give them the chamber pipe so they can get as close a tolerance as possible?
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Unread postAuthor: Atattack » Fri Aug 26, 2011 9:21 pm

You should JSR :D, you have helped me a lot design this thing. I did take chamber pipe to shop yesterday and they did a great job. I just got done cutting 1/2" neoprene for piston and also for the bumper. Just JB welded them into place and put clamps on. Gonna let em sit until Sunday, then take em to shop on Monday to have it welded together. Gettin' there. Will take some pics of piston once I can unclamp it.
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Unread postAuthor: Gun Freak » Fri Aug 26, 2011 9:23 pm

Jb welded rubber sealing face to the piston?? Bad idea... Why didn't you bolt it?
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Unread postAuthor: Atattack » Fri Aug 26, 2011 9:24 pm

I did both, bolted it into piston which I had tapped and also put a 1.5" washer on it. Figured both would give a great fit.
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Unread postAuthor: Gun Freak » Fri Aug 26, 2011 9:28 pm

Well then.

I beg your pardon :tongue3:
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Unread postAuthor: Atattack » Fri Aug 26, 2011 9:33 pm

All good man, my bad, I should have mentioned that.
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Unread postAuthor: Gun Freak » Fri Aug 26, 2011 9:33 pm

Can't wait to see this thing done!!
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Unread postAuthor: Atattack » Fri Aug 26, 2011 9:36 pm

Any suggestions on type of valve I should use to fill the chamber? I have a 3/4" elbow. Is a schrader(sp?) the best? Will need to to be able toehold 400 psi.
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Unread postAuthor: Gun Freak » Fri Aug 26, 2011 10:08 pm

I would just put a tee behind the piston with a schrader on one port and the pilot on the other. That way the pilot volume is kept to a minimum.
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Unread postAuthor: jackssmirkingrevenge » Sat Aug 27, 2011 12:47 am

Looking forward to seeing it :)

In my experience an ordinary schrader valve is good for at least 850 psi.
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