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spring Vs air (piston wise)

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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spring Vs air (piston wise)

Unread postAuthor: Dumb-kid » Thu May 22, 2008 4:55 am

copper sniper under construction

is it better to use a spring behind the piston or shreader vavle ??

which one work better?

:wink:
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Unread postAuthor: psycix » Thu May 22, 2008 5:40 am

Air pressure is far greater then the force a spring usually applies.
If springs were more powerful to acuate pistons, then we would have seen alot of spring-actuated pistons by now, wich isnt the case.
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Unread postAuthor: Dumb-kid » Thu May 22, 2008 6:26 am

sweeeet thankz psycix
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Unread postAuthor: jrrdw » Thu May 22, 2008 7:12 am

I use a spring in my cannon for 2 reasons. 1) To aid in resealing. 2) As a bumper. I adjust the tension by adding a piece of wooden dowel inbetween the sprinkler valve and spring, the wood also protects the sprinkler valve. The spring is bolted to the back of the piston to keep it centered in the pilot chamber.
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Unread postAuthor: sniper hero » Thu May 22, 2008 7:38 am

jrrdw can you post a picture of that?
I would go for air powered btw
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Unread postAuthor: psycix » Thu May 22, 2008 8:08 am

Indeed, for reseating a spring could be used.
This is mostly needed for chamber sealers and is also needed for guns that do not fill from the pilot side.
If you just got a normal barrel sealer that fills from the pilot side, a spring is not really needed. When pumping in air from the pilot side, it will probably be pushed forward and thus reseat.
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Unread postAuthor: Dumb-kid » Fri May 23, 2008 12:52 am

thankz guys well yeah its a barrel sealer
which i pump air in from the chamber, like jrrdw said i also use it as a bumper

i'll have to try both to see which work better

thankz again for the info
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Unread postAuthor: Darkside 6ix » Fri May 23, 2008 12:59 am

I was thinking the same exact thing. the spring can act as 2 things
1- reseats the piston.
2- acts as a built in bumper
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Unread postAuthor: Dumb-kid » Fri May 23, 2008 1:02 am

sweeeet i think spring wins mwhaha :twisted:
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Unread postAuthor: MrCrowley » Fri May 23, 2008 2:24 am

Dumb-kid wrote:sweeeet i think spring wins mwhaha :twisted

Dumb-kid wrote:is it better to use a spring behind the piston or shreader vavle


Ah...you're gonna need a schrader valve or quick connect regardless.

You can't have no fill setup. A spring doesn't fill a piston. So a spring 'can't win', it has advantages over not using a spring. But there is no such thing as 'is a spring better then a schrader'. It makes no sense.
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Unread postAuthor: Dumb-kid » Fri May 23, 2008 4:08 am

ohh true
but my point is is it better to reseal the barrel using springs OR pump air from the back of the pilot chamber to reseal after you fired

but yeah i get your point MrCrowley
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Unread postAuthor: MrCrowley » Fri May 23, 2008 4:12 am

Doesn't matter, depends on what you want. A spring can be a hassle, trying to find the perfect one. You also have to watch piston bounce, that the spring doesn't bounce the piston back and limit flow.
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Unread postAuthor: Carlman » Fri May 23, 2008 4:13 am

pvcpsyco wrote:I was thinking the same exact thing. the spring can act as 2 things
1- reseats the piston.
2- acts as a built in bumper


Read and learn
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Unread postAuthor: jrrdw » Fri May 23, 2008 6:43 am

Bounce is partly why I use a piece of wooden dowel inbetween my SV and spring. Cut it a little long so you can adjust by cutting it down. As for the tension you want the piston sealing face to just touch the sealing face of the barrel.

By the time the piston returns to the barrel the air will be exhausted from the chamber. In my opinion, theres no garrentee, but mine works well. How ever you do it, be sure when you install the filling port make sure it doesn't interfear with the travel of the piston...... :wink:
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Unread postAuthor: Dumb-kid » Fri May 23, 2008 12:20 pm

hey well hassle or not, doesn't matter, the enjoyment of finding the right part for your spudgun (my opinoin) anyway

thankz jrrdw
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