Repairman's knot

For tying up mains leads on equipment, tight to the back of the chassis - is the knotting process described anywhere on the www ?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook
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Do you mean loom binding using waxed thread?

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    Dave Plowman        dave@davenoise.co.uk           London SW
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Dave Plowman (News)

BTW, your sig sep ain't correct.

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    Dave Plowman        dave@davenoise.co.uk           London SW
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Reply to
Dave Plowman (News)

It`s called a rubber band ;)

Presuming you mean to get rid of excess length of cable when the gear is installed. Don,t coil the cable, zigzag it.

Ron(UK)

Reply to
Ron(UK)

I think what he means is something I was taught in electric shop in junior high school (1967?) called an electrician's knot.

Here's a drawing of it:

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and a description:

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I've often cheated in places where the cable was already run and did not want to cut it to tie the knot by taking a large nylon cable tie (aka Tie-Wrap) and placing it around the wire inside the unit. Be sure to leave some slack so that if the wire is pulled it stresses the cable tie, not the wire.

Geoff.

You are right about coiling the wire, it will create a magnetic field. The one exception to that rule is coax, it can be coiled.

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Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com  N3OWJ/4X1GM
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Reply to
Geoffrey S. Mendelson

If the OP meant to tie up the mains cable when transporting an item of equipment, say a vcr or tv, then the usual way is to coil a good portion of the cable closest to the appliance, then squeeze the coils together and wind the rest of the cable around that so that it resembles a hangmans noose. Then the outer loop of one coil is passed over the plug top to secure it.

Or you could use a rubber band.

Careful now... ;)

Ron(UK)

Reply to
Ron(UK)

That's the easiest way. I found that for items I do this with often, such as a laptop power cord, the best thing are nylon strips with velcro on them sold for lacing computer cables.

Geoff.

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Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com  N3OWJ/4X1GM
IL Voice: (07)-7424-1667  Fax ONLY: 972-2-648-1443 U.S. Voice: 1-215-821-1838 
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Reply to
Geoffrey S. Mendelson

1-215-821-1838

Not that one. For storing or just shelving unused equipment , so the mains cable was not trailling about and no need for ties of any sort. All the cable is taken up into the hank/knot leaving just the mains plug exposed and all tight up against the back of the chassis. The person who showed me years ago how to do it , went overboard. It used to annoy me that the bunching was so close to the chassis and bunched so tight you needed a screwdriver to open up the knot and there was always a tight spiral of cable for 6 or so turns when undone that stayed like that. I've long since forgotten how to do it. I invented my own that did not deform the cable so much and easily undone by myself or customers, but you cannot form it right up close to the chassis.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

Ah - know what you mean now. Those old enough to remember rope washing lines will remember they came like that too.

But plastic cable ties weren't around then. ;-)

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    Dave Plowman        dave@davenoise.co.uk           London SW
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Dave Plowman (News)

The person who showed me was ex-services WW2 or 1950s sparky. Yes really tight just like how plastic covered , corded washing lines arrive packed, but with the plug and "noose" spiralling taken right up to the cable entry point and not even any obvious starting point to undo it, let alone being so tight. I remember the final move was really forcing a final loop over or something.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

Yeah, as I said earlier, you take one loop over the plug top.

Ron(UK)

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Ron(UK)

"N Cook" wrote in message news:euauvr$6es$ snipped-for-privacy@inews.gazeta.pl...

Here's the one I was taught. Assuming that you are right handed. Zig-zag the cable in your left hand, starting up close to the equipment, and making the zig-zags about 8 inches. Make about 5 or 6 of them, which should have used up about 1/2 to 2/3 of a 'normal' cable length. Stop zig-zagging when the cable end, with plugtop, is away from you. Now take the remaining cable in your right hand, holding it close to where the zig-zagged piece is hanging out from your left fist, and take a single tightly pulled turn around the end, winding away from yourself. As you complete that first turn, angle the cable in towards your left hand, so that it crosses over the point where that first turn started from. This locks the turn in place, and now you can just go ahead and keep winding the spare cable around, feeding the zig-zagged piece out of your fist, as you go. If you've judged it right ( years of practice ! ) You should get about 11/2 inches from the equipment end of the zigzags, when you have about 6 or 8 inches of cable left. This last piece of cable is formed into a squashed loop, and fed through the end loops of the zig-zags. It is then pulled back over the zig-zag loops, and finally, you pull on the plugtop, which pulls the last loop in nice and tight. This method is the neatest I've ever seen, and NEVER comes undone on its own, unlike attempts that I've seen many engineers make, to reproduce something similar. Where they usually go wrong, is wrapping in the same direction as they made the zig-zags, This fails to lock that first turn in place, so the whole wrap becomes loose and sloppy. It's a lot easier to do than describe, but if this is the standard old repairman's wrap that you were looking for, I'm sure it will come right back to you as soon as you try to follow this.

Arfa

Reply to
Arfa Daily

I've sent you some pictures of a wrap in progress. I have sent them to the same mail address that you post to this group from. If you don't get them, mail me with a different address.

Arfa

Reply to
Arfa Daily

alone

loop

A first time for everything. Worked out how to access the email bit of gazeta.pl, pointless looking at spam otherwise. If it was you who uploaded 9M byte of file/s there it/they will be staying there, no broadband here.

Reply to
N Cook

- - - - - - - - - - - - - - - -

and why is cargo send by ship and shipments by car/truck?

and why do you park on driveways and drive on parkways?

Reply to
Sofie

Depending on where you live, this actually makes "some" sense. You "can" manuever in your driveway - but when you go out onto at least "some" parkways - they're so jammed - they're more like parking lots.

Reply to
Radiosrfun

That's a pity as the pictures showed exactly what you were asking. Just as a matter of interest, if you are involved in commercial repairs, as you appear to be from your postings, how on earth do you get by in this day and age of service info only being available on-line in a majority of cases, without a broadband connection ?? With a dialup connection to the internet, you are walking with dinosaurs, as they say on the BBC ...

Arfa

Reply to
Arfa Daily

Search for the UL knot.

Reply to
Homer J Simpson

If I'm reading him correctly Homey, that's not the knot (!) that he's looking for. I sent him some pictures of the one he wants, but apparently, no BB, so would take him about a week to d/l

9 meg of photos... I'll perhaps put the pics up on a website somewhere so that he can see them, poor boy ... d;~}

Arfa

Reply to
Arfa Daily

Still take as long to load. ;-)

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    Dave Plowman        dave@davenoise.co.uk           London SW
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Dave Plowman (News)

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