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Kinks in coiled wire

Discussion in 'Electronic Basics' started by Ken, May 21, 2005.

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  1. Ken

    Ken Guest

    I tried unsuccessfully to unkink several telephone handset cords and
    wound up replacing them inexpensively. A kink occurs at a place where
    the coil chages sense -- from, e.g., clockwise to counterclockwise.

    However, in the process I searched the web and found almost nothing on
    this phenomenon. Also, studying the kinks did not reveal what is
    really going on. For example, you can move the kink along the coil,
    but the coils traversed become irregular. It would appear that whole
    sections of the coil must change sense for a kink to occur.

    One poster suggested immersing the coil in boiling hot water so that
    the original memory of the plastic cover would return. That did not
    work. Another said -- without more -- that the phenomenon was related
    to one in vines called "tendril reversal."

    Does anyone know of additional information on this subject?
    Ken
    (to reply via email
    remove "zz" from address)
     
  2. Rich Grise

    Rich Grise Guest

    Sure. Just take the "U" where it reverses sense, and patiently work
    it down the backwards part of the loop until you untwist it. Let the
    free end flop freely, because it has to twirl a whole revolution for
    each backwards loop.

    Alternatively, you could tie a heavy weight at one end of the kinky
    cord - very heavy, so it stretches it out practically straight; suspend
    it by the other end, and let it unwind itself practically completely.
    Then twirl the weight in the direction that it's "supposed" to coil,
    putting a really good set in the extended cord, and when you let it
    relax, it will coil naturally.

    What causes it is, picking up the phone with one hand, putting it
    to your ear, halfway through the conversation switching to the other
    ear, then hanging up with the other hand. Sometimes, people answer
    by scooping up the handset, palm up - this puts a whole twist in the
    wire, usually the opposite sense of the original cord.

    Good Luck!
    Rich
     
  3. John - kd5yi

    John - kd5yi Guest


    Too complicated for my feeble brain. I fixed the problem by getting
    cordless phones.

    I'm lazy.

    John
     
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