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spring for a 400psi PCP?

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 for a 400psi PCP?

Unread postAuthor: ilovefire » Fri Jul 01, 2011 7:43 pm

i am currently attempting to make a low powered PCP air gun and am stuck on what spring i need and where i can get it

the hammer valve seat diameter is 10mm
pressure when full 400psi
hammer weight 60g
hammer length 4.5cm
distance between valve and back of hammer tube 12.5cm
OD of the spring needed 13mm

with all that in mind is there anyone here who is smart enough to figure out what spring i need? and where i could get said spring? also if it helps i have tested dropping the hammer down a 65cm tube onto the the valve and got to open the valve almost to just the right amount. if someone can help i may possibly have an alright gun to show you guys sometime soon, and if you like i can post pics of what i have so far, but ill have to wait for the internet to go back to full speed
cheers
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why make it if it dosent shoot?
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 02, 2011 1:20 am

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Unread postAuthor: Lockednloaded » Sat Jul 02, 2011 2:22 am

Im not great with spring calculations, but Hooke's Law may be of intrest if you hadnt considered it
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Re: spring for a 400psi PCP?

Unread postAuthor: Crna Legija » Sat Jul 02, 2011 2:25 am

ilovefire wrote:i am currently attempting to make a low powered PCP air gun and am stuck on what spring i need and where i can get it

the hammer valve seat diameter is 10mm
pressure when full 400psi
hammer weight 60g
hammer length 4.5cm
distance between valve and back of hammer tube 12.5cm
OD of the spring needed 13mm

with all that in mind is there anyone here who is smart enough to figure out what spring i need? and where i could get said spring? also if it helps i have tested dropping the hammer down a 65cm tube onto the the valve and got to open the valve almost to just the right amount. if someone can help i may possibly have an alright gun to show you guys sometime soon, and if you like i can post pics of what i have so far, but ill have to wait for the internet to go back to full speed
cheers


have you checked bunnings they have a spring isle.
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Unread postAuthor: ilovefire » Sat Jul 02, 2011 3:07 am

JSR

thanks, altho i must admit to not reading it the whole way through because must of the instructions were for people with lathes, talking about lathes congratulations on getting yours :)
i did however attempt making a spring from what i could understand of it, and it kinda worked, i mean it was a spring, but it didn't like being compressed in the tube and kept getting jammed, it is now located in the bin :roll:

Lockednloaded

that link just confirmed what i already knew about springs

Crna Legija

yes i went to bunnings but they didn't have the right diameter, and are bloody expensive (at least for some who works for $20 a day)
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why make it if it dosent shoot?
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