Copper Springs -

Discussion in 'The Projects Forum' started by bio88, Oct 6, 2011.

  1. bio88

    Thread Starter Member

    Feb 17, 2011
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    Hi - Looking for a source of small copper compression springs. I need copper so I can solder a wire to the spring. For prototyping the spring could come from a ball point pen. Any help appreciated -
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
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    You can solder iron/steel also. But it could be that your springs are covered/plated with some alloy that need to be filed/grind down before you solder. It could be that your spring is nickel plated
    Edit
    On second thought. I am not sure steel can be soldered with electronic solder. But I know for sure iron can be soldered with electronic solder. A problem may be to transfer enough heat from the solder iron to the spring. To get a proper solder
     
    Last edited: Oct 6, 2011
  3. SgtWookie

    Expert

    Jul 17, 2007
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    You might inquire from this company:
    http://www.leespring.com/materials.asp

    A blurb from the lower part of the page:
    The silver coated beryllium copper will be the easiest to solder to, and you will lose little in the way of conductivity over pure copper. Pure copper is a poor material to make springs from, as it is too soft.

    Springs made from other materials will have poor conductivity, resulting in power dissipation/power loss in the spring.

    You may find that it's easier to simply use a steel spring that presses on a small circle of copper with a flexible stranded or braided wire soldered to it.
     
    Last edited: Oct 6, 2011
  4. bio88

    Thread Starter Member

    Feb 17, 2011
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    Great info thanks guys -
     
  5. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    The springs used in small electric motors for the brushes may work for you. Most times they are made of brass and conduct electric well and can be soldered. You don't say where your from, but, if you have a hobby/RC car shop in your area, they will have replacement motor brush assemblies to chose from.
     
  6. Wendy

    Moderator

    Mar 24, 2008
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    Note, beryllium copper is safe, but if machine the metal the beryllium part is highly toxic. The dust will do permanent damage to your lungs, and possibly worse.
     
  7. HarveyH42

    Active Member

    Jul 22, 2007
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  8. KJ6EAD

    Senior Member

    Apr 30, 2011
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    The springs in better quality fuse holders are also an option.
     
  9. SgtWookie

    Expert

    Jul 17, 2007
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  10. someonesdad

    Senior Member

    Jul 7, 2009
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    They look like brass springs.

    Note you can copper plate steel (copper can be done with something like copper sulfate and an acid, IIRC); then it's easier to solder to steel. Another way is to just use an acid core solder and make sure you clean off the flux thoroughly.
     
  11. HarveyH42

    Active Member

    Jul 22, 2007
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    Just remembered seeing them, wouldn't think a pure copper spring would be too 'springy', and would tend to break easy. Personally, I'd scrounge something up around the house. Spring out of a retractable pen, probably. Depends on how many the OP is looking for, just figured this would be a potential source, if several are needed. I'm sort of looking for a springy solution for using cellphone/camera lithium batteries in other projects. Copper would be a poor choice, gold plated ideal. Sort of worked out an idea using pin headers, but didn't really line up well with the battery terminals, little longer would have been nice too. Did notice that the plastic spacer moves when heated, so might try again sometime.
     
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