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advantages of cable lacing?

Discussion in 'Electronic Repair' started by [email protected], Jan 8, 2005.

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  1. Guest

    cable lacing... a lost art.

    Is there anything that a laced cable-bundle does better than a
    tie-wrapped cable-bundle?
  2. Tim Wescott

    Tim Wescott Guest

    Feed through a round tube.

    Look good.

    Lacing is still alive and well, it's used for many harnesses in
    aerospace equipment, although tie-wrap is being used as well.
  3. John Kunkel

    John Kunkel Guest

    I don't know about "does better" but it sure looks good.

    My background is in aviation maintenance and I laced the wires in a street
    rod years ago; very labor intensive but I got some comments on it from those
    had never seen it done. IMO it looks better in bundles where the wire is all
    the same color, the various colored wire commonly used in automotive
    applications doesn't look as good laced.
  4. Matt Whiting

    Matt Whiting Guest

    I think it looks nicer, but functionally I don't believe there is any
    difference. Both methods keep the wires neat and organized.

  5. CJT

    CJT Guest

    Lacing might contribute a little extra strength in the long direction.

    Plus, as others have noted, it looks better.
  6. w_tom

    w_tom Guest

    Lacing (if it really a nylon laced tube) protects wires from
    failure due to constant vibration (ie automotive). Also the
    lacing can hold cable together over long distances without
    compressing insulation too tightly at the nylon ty wrapped.
    Missing information is the environment for that cable. Looks
    really have little to due with why things are done.
    Furthermore, sometimes a better looking (cleaner) installation
    can make things electrically worse.
  7. Phil

    Phil Guest

    Tie-wrapping can also turn a bundle of RF cables into a bundle of RF
  8. CJT

    CJT Guest

    .... and make crosstalk more of an issue.
  9. NSM

    NSM Guest

    | cable lacing... a lost art.
    | Is there anything that a laced cable-bundle does better than a
    | tie-wrapped cable-bundle?

    Don't overlook spiral wrapping.

  10. That is true... *if* both are done correctly.

    However, the usual poor job of lacing will have few if any
    negative effects, while a poor job of using tie-wraps can
    1) put crimps in the cables, 2) literally break wires, and
    3) leave some very sharp edges that can slice up hands that
    handle the bundle years into the future.

    Hence, if the craftperson knows what they're doing... lacing is
    pretty and tie-wrapping is easy. If they don't really know the
    difference, lacing is safer.
  11. Blueskies

    Blueskies Guest

    Less cut knuckles.

    Less expensive?

  12. Matt Whiting

    Matt Whiting Guest

    How is tie wrapping any worse than lacing in this regard?

  13. w_tom

    w_tom Guest

    Ty wrap, for example, a coaxial cable. Now wire's
    characteristic impedance is changed where ty wrap pressure has
    changed dimensions of cable.
  14. Phil

    Phil Guest

    That is the answer indeed.

    Applying tie wraps on a coaxial cable with a copper braid - even without
    exaggerating the pressure - precisely every 20 cm or so over tens of meters
    makes great filters.

    I suppose lacing allows a milder treatment for RF cables.

  15. And, you don't get flesh wounds from the cut ends of nylon cable ties. :)

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  16. Gregg

    Gregg Guest

    In the case of temprature extremes (outdoor applications, direct UV
    exposure or vacuum tube chassis), I belive a laced bundle will outlive a
    tie strapped bundle. Also more economical - have you seen the prices of
    zip-ties that can handle the environmental extremes of good ol' lacing?
  17. Matt Whiting

    Matt Whiting Guest

    You don't have to apply 50 lbs of tension to the tie wrap! :)

  18. Indeed there is a difference, notably in the aviation world.

    Look inside the avionics bay of a commercial jet sometime. Come to
    think of it, look at the innards of any piece of older avionics gear
    that uses point-to-point wiring instead of, or in addition to, a printed
    circuit backplane. What you'll see is the absence of tie-wraps, and an
    abundance of laced cable harnesses.

    I used to work at Boeing, and I had some friends in the Wire
    Design group. I asked about this very question once. I was told that
    tie-wraps are not favored for two reasons.

    (1) If the tension on the tie-wrap is too high, it can crush
    fragile coaxial cables.

    (2) It's much easier to damage wire insulation under tie-wraps in
    a high-vibration environment. Lacing twine is nowhere near as sharp
    along its edges, and thus does not nick or cut said insulation.

    Keep the peace(es).

    Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
    (Known to some as Bruce Lane, ARS KC7GR,
    kyrrin (a/t) bluefeathertech[d=o=t]calm --
    "If Salvador Dali had owned a computer, would it have been equipped
    with surreal ports?"
  19. NSM

    NSM Guest

    | > Matt Whiting wrote:
    | >
    | >>How is tie wrapping any worse than lacing in this regard?
    | >>
    | >>Matt
    | You don't have to apply 50 lbs of tension to the tie wrap! :)
    | Matt

    I pull them up till they break then loosen them two clicks.
    Or else I pull them up as tight as they'll go then add another 50 lbs.

  20. I think the advantage of lacing here is that the loops around the bundle
    are held in place along the length of the bundle. With tie wraps, more
    pressure is needed to keep them from slipping over time.
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