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advantages of cable lacing?

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

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  1. Biggest advantage is you don't get cut by poorly trimmed tie wraps!
     
  2. Slip'er

    Slip'er Guest

    Okay, what does lacing look like? I've never noticed it...
     
  3. Guest

    It weighs less, costs less, requires less equipment to install .
    I've never heard of anyone slicing their hand open on lacing but I've
    seen some serious lacerations from the cut-ends of tie-wrap.

    If you've never done it, give it a try. Even if you don't use it,
    it's a handy skill to have in your warbag.

    -R.S.Hoover
     
  4. NSM

    NSM Guest

    | Okay, what does lacing look like? I've never noticed it...

    Looks like a sausage wrapped in string. The string may be waxed string (old
    style) or small diameter plastic tubing.

    N
     
  5. John G

    John G Guest

    You have never worked on aircraft and are very young.
     
  6. RS Components ( rswww.com) have it under part number 554-080
    and describe it as: "A strong and flexible rayon-cored PVC
    string for all ‘cable-forming’ and similar applications.
    Dia. 0·75 mm. Breaking strain 4·5 kg (10 lb).
    Colour: Black."

    The start and finish knots, as well as the intermediate
    ones, are very specific and designed so that the cord will
    not work loose or the knots move on the cable assembly.

    Laced "Commercial" wiring looms are normally assembled on a
    make-up board which has the position of every knot clearly
    defined along the length of the loom - so each wiring loom
    turns out identical.

    Once you are taught how to lace, you don't forget. Probably
    something to do with the instructor cutting the whole lacing
    off the loom for a single knot incorrectly positioned,
    tensioned or done - leaving you to do the whole job again,
    and again and again.

    It didn't used to pay to be "the" female apprentice as
    females are supposed to have nimbler fingers, a greater
    attention to detail and more patience for doing mundane
    repetitive work. So, whereas the guys could get away with a
    half-assed job, I got to see the same loom time and time
    again... Or it could just be I missed out that bit of the
    genes...
     
  7. Guest

  8. Ken Moffett

    Ken Moffett Guest

  9. Ken Moffett

    Ken Moffett Guest

  10. No one has mentioned that cable mining is much safer and easier with laced
    cables and can be impossible with ty wrapped cables.
     
  11. Ron

    Ron Guest

    BOY! These 'How-To' websites certainly bring back memories. These are the
    methods, procedures, & materials we used when I hired on with Western
    Electric in the early 50s. In those days we used tons of #6 & #12 cord for
    securing gazillions of feet of telephone cables inside the telephone company
    switching central offices. We also got lots of blisters & calluses while
    making the cabling look neat & secure. Cable mining? YUK!

    Thanks!

    Ron

    ---
     
  12. Blueskies

    Blueskies Guest


    What is cable mining?
     
  13. New cables are laid into cable racks on top of old cables, and
    the old ones that are no longer used are just cut off where they
    enter the cable rack and left in place. Eventually, of course,
    the cable rack fills up with old unused cable.

    So every decade or so some poor smucks get the job of removing
    all old cables. And that... is cable mining.

    It isn't fun and it isn't exciting (but if you get the cable it
    might be profitable though).

    And if any of the cable was put in with tie-wraps, you also get
    your hands shredded from the sharp edges where the tie wraps
    were cut off. That is bad enough if a proper tool is used, and
    *far* worse if some dingbat has used snips to cut them.
     
  14. Slip'er

    Slip'er Guest

    You have never worked on aircraft and are very young.

    I have never worked on aircraft. I am 37; young to some, ancient to my
    kids.
     
  15. Slip'er

    Slip'er Guest

    That's exactly the kind of reply everybody likes to get to a question.
    Thanks.

    Slip'er
     
  16. Slip'er

    Slip'er Guest

    Thanks Ken.

    "> Look at pages 3 and 4:
     
  17. shay

    shay Guest

    Spiral Wrap is pretty nice and robust but when it comes to
    fault-finding broken wires etc it can be a bitch.
    Have a look at this :

    http://www.geocities.com/svxdc/AI-pics/254-11a-HarnAdapWrap.jpg

    I find this better for dirty/oily environments or where there's a
    chance of vibration. The the harnes is easly "moulded" to fit intricate
    contours.
     
  18. Bill Turner

    Bill Turner Guest

    ___________________________________________________________

    I'm sure the unions prefer lacing.
     
  19. Ross Herbert

    Ross Herbert Guest


    That brings back memories of the 50's...

    While the document gives explicit details of "straight line" lacing of
    a conductor wiring form (loom) it doesn't cover the all important
    techniques used at single and double directional branches.

    The art of lacing doesn't only apply to conductor wiring forms but
    also to block lacing of a whole group of multi-conductor cables. This
    was the art of grouping many cables into an octagonal block and fixing
    it to overhead cable runways as in the old step-by-step exchange days
    prior to the advent of pvc sheathed cables, cable troughing and
    eventually overhead cabling mesh. As a trainee tech I remember
    spending a whole week block lacing a group of 64 cables x 20 triples
    (60w) into an 8x8 block in a complicated level change from high level
    to low level (self supporting block in mid air) runway with several
    bends in the final structure, only to have my supervisor cut the
    lacing at every lacing point because it wasn't good enough. I was mad
    as hell at having to do it all again and it took some time to mend our
    relationship.
     
  20. Ross Herbert

    Ross Herbert Guest

    Ron, with SxS every cable run was intricately planned and the
    individual cables in a block had to occupy a pre-determined location
    in the block so that the cables would fall out at both ends without
    any cross-overs. It was a laborious task and perhaps you recall making
    up the block layout sketches and walking the cable route with the
    sketch in front of you and turning it in accordance with the twists
    and turns, just so that you could verify that you had every cable in
    the right location? Planning a cable block layout was a skill in those
    days. Cable recovery in step exchanges occurred rarely unless a major
    change was required and runway space was insufficient for the new run.
    When total overhead cable mesh and free run cabling came in during the
    60's with crossbar installations the only cable lacing was at the
    equipment rack ends where the wires were formed into looms for
    distribution to the respective relayset terminating jacks. With many
    more cables required for crossbar the old block lacing methods were no
    longer suitable and the view of the overhead cabling in a crossbar
    exchange looked like spaghetti junction with cables about 2 feet deep
    at certain places. Nobody bothered about recovring the dead cables
    because it was almost impossible to do so. Only when these exchanges
    were pulled out in the 90's was any cable mining done.
     
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