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Curly Cord

Discussion in 'Security Alarms' started by Bob La Londe, Aug 30, 2012.

  1. Bob La Londe

    Bob La Londe Guest

    I am looking for a decent length multi conductor curly cord. So far the
    most I have found is 10 conductors. Its for a custom built remote for a CNC
    machine, but if anybody knows wire its this group.

    I can get by with 10, but 12 would be better allowing my to run a separate
    common for critical items like an emergency stop circuit. I'ld like
    conductors large enough to tin and put in a screw terminal, and a fair
    amount of straight jacket at each end. If the curly part easily stretches
    to about 4 feet with a max of 5 or so it would be perfect.
     
    Sarah Huang likes this.
  2. NickMark

    NickMark Guest

    check with Stanton industrial electric supply he finds all kinds of wire for me412-242-9300
     
    Sarah Huang likes this.
  3. Robert Macy

    Robert Macy Guest

    If you can't find it, I believe it's possible to construct your own
    using highly flexible wires and curly plastic tubing. Assuming you
    have room for that. At least that way, you shouldn't run out of
    conductors. As I recall, something like 4 inch diameter plastic
    coils.

    One project we used fibred flex cable all rolled up. take a look
    inside an old printer for an example. Interestingly, the strain relief
    had to extend several inches because even the longitudinal flexing of
    the cabling tended to break it. Another polyimide PCB [I think, may
    have been polyamide, which works in a vacuum, too]

    From memory, the high quality curly cords we used were copper foil
    wrapped over silk thread. They were rather resistive, but never broke,
    and IMPOSSIBLE to kluge to to make a temporary connection. The cheap
    ones out of Asia were simply tiny fibres of copper, like 15-22 strands
    per conductor, but they were one tenth the resistance and EASY to
    kluge connections to with a soldering iron, which is guarranteed to
    make a spot for the cable to break.
     
    Sarah Huang likes this.
  4. Bob La Londe

    Bob La Londe Guest

    Typically with a curly cord there is a fixed cable pass through were
    movement ends if setup properly. There should be a strain relief installed
    at that point also. All splices, connections, etc should be made beyond
    that point so that no movement can dislodge them or create high strain at a
    "hard point" like the tinned end of a conductor. Even something as simple
    as the plug on the end of a telephone cord employs this principal to some
    degree. There is a plastic tab that compresses down and holds the cable in
    place. The individual conductors are then penetrated (for stranded) or
    skinned (for solid) beyond that point to make the electrical connection.
     
    Sarah Huang likes this.
  5. Jim

    Jim Guest

    I know that nowdays you can buy just about anything that you can think of but years and years ago when I was working for a manufacturer we needed a coil cord (only one for a custom made one of a kind product) I was shop forman at the time so I had the responsibility of getting the end product made.

    I found a coiled spring about 18 or 16 ( forget) guage spring steel, about 2 inches in diameter and one foot long retracted. I located some of the type of wire they use in telephone coil cords. ( woven with thread ) but it was 22 guage wire. I threaded some thin teflon tubing over the spring (to avoid abrasion) . I had discovered somewhere that if you soak vinyl tubing inMethyl Ethel Keytone that it will expand and when it dries out, the tubingwill recover to it's original diameter. I picked a size of thin wall tubing that wouldn't be too thight and pulled the teflon covered spring and the 12 strands of wire through the expanded PVC and let it dry in the coiled position. I wound up with a fairly tight 3 foot (retracted) coil cord that was being used daily maybe five hundred to a thousand expansions a day. As far as I know, the system was still functioning 5 years later. It was only being pulled out to about 4 to five feet, so it didn't get that much wear. The hardest thing in the whole project was terminating that damn wire. I doesn't solder or crimp easily.
     
    Sarah Huang likes this.
  6. Bob La Londe

    Bob La Londe Guest

    Yeah... termination is a pain. Had to do that once or twice for custom installation. I'm actually considering using one of the 10 conductor prefab RJ45 style plug/cords instead, and moving my E-stop button to a fixed location instead of on the control pendant.
     
    Sarah Huang likes this.
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