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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: roughboy » Tue May 15, 2007 12:39 am

when building a piston gun is it important to install a bumper?

Is a bumper really important? even on an all steel piston cannon?



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Unread postAuthor: A-98 » Tue May 15, 2007 1:07 am

yes, very, very , very important. i have an o-ring bumper on a piston that weighs less than a gram, but i still have one.
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Unread postAuthor: jackssmirkingrevenge » Tue May 15, 2007 2:15 am

It's a simple thing to add and has its benefits in the long run - even steel will deform from repeated impacts, and after a while that will easily jam your piston.
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Unread postAuthor: TwitchTheAussie » Tue May 15, 2007 2:22 am

Yup go with the O :lol: Cant wait to see it.
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Unread postAuthor: chaos » Tue May 15, 2007 2:35 am

you guys have just made me relize how important these are, ill put one on mine asap.

yer use one mine is steel and it will help keep your piston from jamming.
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Unread postAuthor: jackssmirkingrevenge » Tue May 15, 2007 2:49 am

chaos wrote:you guys have just made me relize how important these are, ill put one on mine asap.


Didn´t yours have a spring already?
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Unread postAuthor: chaos » Tue May 15, 2007 3:10 am

Yer its got one. why, dont i need one if i got a spring?
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Unread postAuthor: jackssmirkingrevenge » Tue May 15, 2007 3:25 am

Well, a bumper is something that prevents the piston from slamming into the chamber endcap at full force - in this case, you have a spring for a bumper :wink:
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Unread postAuthor: AmYisroelChai » Tue May 15, 2007 11:56 am

Jack how strong would you say the spring needs to be for it to be a succesfull bumper? Also wouldnt the spring itself warp?

I am trying my first Barrel sealer now and I have a decent spring I want to try out for a bumber. I am concerned because it compresses with about 1-2lbs of force...
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Unread postAuthor: jackssmirkingrevenge » Tue May 15, 2007 2:41 pm

Personally I'd rather use a shock-absorbing bumper like rubber padding instead of a spring - simply because the spring won't allow maximum acceleration at the time of firing when it's most critical, which will hurt performance a little.
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Unread postAuthor: Panzerfaust » Tue May 15, 2007 2:50 pm

I use a piece of thick rubber hose folded over behind the piston. At first i used some pipe insulation foam tube but that got sucked into the pilot.
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Unread postAuthor: chaos » Tue May 15, 2007 4:04 pm

my barrel sealer has a spring that allows the piston to operate at 50psi, and it gets coilbound (fully compressed) when i shoot it, maybe a rubber washer behind the spring would help.
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Unread postAuthor: roughboy » Wed May 16, 2007 12:05 am

what if my piston is made of hot glue do i still need a bumper?
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Unread postAuthor: A-98 » Wed May 16, 2007 12:10 am

tis a good idea. basic rule of thumb, if its under pressure, your main valve, and moves, you need a bumper.
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Unread postAuthor: hi » Sun Jun 10, 2007 11:54 pm

sorry for kicking up an old thread, but im working on another piston valve and i have a spring and some hose for a bumper. can i use both just for extra safty? does it really matter?
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