How To calculate spring specs? Please help!

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SpudFiles Forum Index » Hybrid Cannon Discussion » How To calculate spring specs? Please help!

How To calculate spring specs? Please help!

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BigBang J

Posted: 08/17/2010 15:33 PM Post subject: How To calculate spring specs? Please help!

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Joined: 08 Jul 2010
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Hi, I need some help here I am working a hybrid with a mix of 7x.
I was wodering how to calculate spring specs for the valve I am building.I mean if I want the valve to start opening around 500 psi, do I need a spring that is rated at 500lbs? Please help me out here.
Thanks in advance

jackssmirkingrevenge

Posted: 08/17/2010 15:45 PM Post subject:

aspiring machinist
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Joined: 15 Mar 2007
Posts: 18061
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You need to calculate the exposed area of the piston:

(pi x piston radius x piston radius) - (pi x barrel external radius x barrel external radius)

Do that with all dimenstions in inches, and multiply the result by 500

Heimo

Posted: 08/17/2010 15:50 PM Post subject:

2nd Lieutenant

Joined: 25 Oct 2009
Posts: 219
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Here are a couple of calculators I found that might help you answer your own question just cause I don't really know how to help you

this one seemed to be the best and easiest to use
http://www.msdspring.com/springcalculator/compression/Input_round_cyl. asp

and here are some others that looked good

http://www.engineersedge.com/spring_comp_calc.htm
http://www.tribology-abc.com/calculators/t14_1.htm
http://www.calculatoredge.com/mech/hspring.htm

Lockednloaded

Posted: 08/17/2010 16:04 PM Post subject:

El Moderador
Major General

Joined: 03 Sep 2009
Posts: 1345
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to calculate the forces on the piston you also have to account for surface area of your piston that it showing pre-explosion

lozz08

Posted: 08/17/2010 17:16 PM Post subject:

2nd Lieutenant

Joined: 01 Jul 2009
Posts: 238
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Rip out your calculator, and do this:
enter the diameter of the hole that the air goes through to push the piston.
divide that number by two.
times the answer to that by itself.
times the answer to that by the number 3.142.

the result of all that is the area. now you times the area by whatever pressure you are using, and the answer to that will be the spring force.

D_Hall

Posted: 08/17/2010 19:37 PM Post subject:

Donating Member
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Joined: 07 Feb 2008
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1) Hooke's Law
2) Pascal's Law
3) Wikipedia

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