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Piston Bumper

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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Piston Bumper

Unread postAuthor: squeaks » Sat Nov 18, 2006 8:54 am

Ok, I just finished a chamber sealing piston that I made out of Redwood(Bad idea) and after I fired it twice my pretty pink piston(hahaha, redwood, pink) was cracked really bad. I have a compression spring to help slow the piston in my gun, and I figure the main problem was the redwood, but should I get something else to help slow my next piston?
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Unread postAuthor: nicholai » Sat Nov 18, 2006 10:47 am

glue some 1/4" rubber on the ass end of it, that might help
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Unread postAuthor: Scope » Sat Nov 18, 2006 10:52 am

I haven't done it but from what ive seen people cut tennis balls in half and use them as bumpers... theres a good easy solution.
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Unread postAuthor: Infernal2 » Sat Nov 18, 2006 1:24 pm

You could use a really strong compression spring or use small cut sections of garden hose. Tennis balls work great too.
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Unread postAuthor: rna_duelers » Sat Nov 18, 2006 7:55 pm

Tennis balls work ohhk.But make sure you have a hole in the middle to vent it.
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Unread postAuthor: experament_u2 » Sat Nov 18, 2006 9:42 pm

just get some rubber or air hose and stick in the bak and it should work 8)
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Unread postAuthor: Hayseed_Andrew » Wed Nov 29, 2006 4:54 pm

Has anyone tried not using a bumper, like just leaving some air in the chanber to sorta cushon it, because I think that would make it quieter.
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Unread postAuthor: POS » Thu Nov 30, 2006 5:46 pm

I have been thinking something like that. When your gun operates at lets say 200 psi, you should have some kind of valve that shuts at 100 psi. That way, only half of the pressurizes air will escape. By the time it escaped, the ammo has been shot out of the barrel. When the valve shuts at a pilot presure of 100 psi, the piston will move forward again, saving some of the pressurized air in the chamber. That way, you can operate your gun at 200 psi, but you dont have to fill it from scratch, sinds the chamber will still have pressure little less then 100 psi.

Hope you understand what I mean .... :?
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Unread postAuthor: schmanman » Thu Nov 30, 2006 5:50 pm

I don't use a bumper in the swat gun. It works just fine, and after several hundred shots, nothing shows any signs of stress. I may put some hose in there, though.
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Unread postAuthor: Hayseed_Andrew » Thu Nov 30, 2006 6:27 pm

POS wrote:I have been thinking something like that. When your gun operates at lets say 200 psi, you should have some kind of valve that shuts at 100 psi. That way, only half of the pressurizes air will escape. By the time it escaped, the ammo has been shot out of the barrel. When the valve shuts at a pilot presure of 100 psi, the piston will move forward again, saving some of the pressurized air in the chamber. That way, you can operate your gun at 200 psi, but you dont have to fill it from scratch, sinds the chamber will still have pressure little less then 100 psi.

Hope you understand what I mean .... :?


Ya that's ecactly what I was thinking of, and I was thinking that maybe, since that little bit of air is there to cushon it, that the valve wouldn't make as much noise because it isn't actually slamming into anything, just sorta stopping when it compresses the air.
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Unread postAuthor: Monkey621 » Thu Nov 30, 2006 6:28 pm

I want to see if using a REALLY strong spring will work to keep some air in. I'm going to try it in my first piston. I can always tune it by putting in incrementally less powerful springs. You might be able to keep some air in it that way or somehow make it semi-auto.
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Unread postAuthor: Hayseed_Andrew » Thu Nov 30, 2006 6:30 pm

ya maybe but i was just looking for something to make it quieter.
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