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Working out compressed spring length ?

Discussion in 'Anything Airgun Related' started by JD, Mar 29, 2014.

  1. JD

    JD Donator

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    If you know the available space inside of a spring rifles piston, you should be able to work how much compressed spring you can fit inside,

    But how do you work out the compressed length of a spring, from it's free length ?
     
  2. bobbie1

    bobbie1 Busy Member

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    measure the diameter of the wire then multiply it, until it is the same size as the length of the inside of your piston , , then take a few mm off so it don't bind ,
     
    Last edited: Mar 29, 2014
  3. SteveO

    SteveO Top Poster

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    I mount the spring on some threaded rod with a washer and nut each end and compress it!
     
  4. JD

    JD Donator

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    The only thing about using this method that puts me off, is scratching the inside of the spring on the threads of the bar.
     
  5. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    Simple answer; counting the total number of coils and multiply it by the wire diameter will give you the "solid height".

    Wouldn't worry about scratching the spring - it will be much, much harder than any threaded bar ;)
     
  6. JD

    JD Donator

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    Thanks guys, its a pita when you have to re-strip a rifle because its coil bound. : )
     
  7. SteveO

    SteveO Top Poster

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    I had to mess about stripping and rebuilding my 99 loads of times to get the power right, I compressed the spring on a threaded rod and measured the guide and top hat to find the maximum space I had to play with, it only has 1mm of free space left before it won't latch on cocking!
     

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