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Recent content by JohnPP

  1. JohnPP

    BeCu extension spring

    Good News ! Our vendor confirm today that they can make it next week . Thanks to all of you provided help whole heartly . Thanks again . JohnPP
  2. JohnPP

    BeCu extension spring

    Hi israelkk, Thanks to your advise . After this project , if I still have time , I will review the calculation matter that may be further interest to me .
  3. JohnPP

    BeCu extension spring

    Hi israelkk , Thanks to your advise . BeCu alloy is the spec that customer want . I am using BeCu 4/3H and it is less flexible before heat treatment , I mean not much spring effect . And using this Forums , I find a lot of help and can refreash my engineering knowledge after my graduation 20...
  4. JohnPP

    BeCu extension spring

    Hi metman , What is Bright dip ? Thanks ,
  5. JohnPP

    BeCu extension spring

    Hi EdStainless and metman , As in the other thread link , I mentioned that I better describe it as I am making a BeCu extension type garter spring fpr EMI gasket purpose , and the pull force needed is not very important and I can use the basic trial and error method to make one with correct...
  6. JohnPP

    BeCu extension spring

    By the way , the current vendor has made the stainless steel gater spring for us with good ends ( front and rear )and no heat treatment needed after cold work , This time we have problem of heat treatment ( expand the space between pitches ! ) If I vist them and use negative pitch concept...
  7. JohnPP

    BeCu extension spring

    I should say more correct term is to make BeCu Garter gasket ( extension type ) . Its function is as gasket , the force data really not very important . Brushwellman people also has mentioned - negative coiling pitch , but our spring making vendor seems doesn't know this term ? As I am not...
  8. JohnPP

    BeCu extension spring

    I am working a project : To use BeCu wire to make an extension spring ( gasket ) for EMI shielding . I have asked the spring coil vendor to make the coil for me ( wire diameter is 0.19mm and to form coil diameter 1.0 mm with spring about 140 mm length ) I use BRUSHWELLMAN Alloy 25 with 3/4H ...
  9. JohnPP

    BeCu extension spring

    Thanks EdStainless , The agent of Brushwellman told me to reheat it after the cold work of spring forming ( actually I told our vendor to do the heat treatment process ), although she has no experience of forming BeCu extension spring . The reason she said is that it will release the main...
  10. JohnPP

    BeCu extension spring

    Thanks zekeman , The agent of Brushwellman told me to reheat it after the cold work of spring forming ( actually I told our vendor to do the heat treatment process ), although she has no experience of forming BeCu extension spring . The reason she said is that it will release the main...
  11. JohnPP

    BeCu extension spring

    I am working a project : To use BeCu wire to make an extension spring ( gasket ) for EMI shielding . I have asked the spring coil vendor to make the coil for me ( wire diameter is 0.19mm and to form coil diameter 1.0 mm with spring about 140 mm length ) I use BRUSHWELLMAN Alloy 25 with 3/4H ...
  12. JohnPP

    BeCu extension spring

    I am working a project : To use BeCu wire to make an extension spring ( gasket ) for EMI shielding . I have asked the spring coil vendor to make the coil for me ( wire diameter is 0.19mm and to form coil diameter 1.0 mm with spring about 140 mm length ) I use BRUSHWELLMAN Alloy 25 with 3/4H ...
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