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Old 10th January 2012, 03:01 PM   #11
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Einric View Post
Here is the twist I use for three wires.
I don't see the problem/flaw in my process.
If you twist by your described method then you have strained both the insulator sleeves and the conductor cores. The strains will be much higher than if the wires were twisted using the contra-rotating method.
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Old 10th January 2012, 03:10 PM   #12
badman is offline badman  United States
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If you twist by your described method then you have strained both the insulator sleeves and the conductor cores. The strains will be much higher than if the wires were twisted using the contra-rotating method.
Yes, absolutely true. A drill is a terrible way to do it.

Bulk wire twisting is done with jigs that allow the wire to rotate axially.
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Old 10th January 2012, 03:23 PM   #13
AndrewT is offline AndrewT  Scotland
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If one is twisting stainless lock wire using that little hand tool, then one is deliberately work hardening the wire to help it resist untwisting. That would be the intended purpose of the twisted lock wire.
That is not what one does to electric cables/cords.
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Old 10th January 2012, 04:11 PM   #14
back is offline back  Greece
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Quote:
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If you twist by your described method then you have strained both the insulator sleeves and the conductor cores. The strains will be much higher than if the wires were twisted using the contra-rotating method.
so by contra rotating you mean twisting the to clock wise and the third counter clock wise?
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Old 10th January 2012, 04:51 PM   #15
AndrewT is offline AndrewT  Scotland
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If you are twisting the whole set/group of wires in a clockwise direction, then each individual wire of the group gets twisted anticlockwise.

Have a look for a U tube video of a wire cable winding/twisting machine. And see the complication they go to, to avoid excessive strain on the individual wires during the cable forming operation.
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Old 10th January 2012, 06:01 PM   #16
Einric is offline Einric  United States
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I see....I will try to build a jig to twist wire in the manner you describe.
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Old 10th January 2012, 06:04 PM   #17
AndrewT is offline AndrewT  Scotland
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Do it by hand !
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Old 10th January 2012, 06:08 PM   #18
Einric is offline Einric  United States
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I'd be building cables up to 12 feet long, by hand would take too long.
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Old 10th January 2012, 06:14 PM   #19
AndrewT is offline AndrewT  Scotland
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I built star quads that ended up 3m long after twisting.
They started out quite a bit longer than 12'

I hung the 4 wire group on a door handle. It was not difficult nor was it particularly time consuming.
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Old 10th January 2012, 08:01 PM   #20
back is offline back  Greece
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thanks for all the replies.
any recommendations on
what cable to use?

ps.i have an idea.
i have some belden 19364.
do you guys think it would be good?
it`s already twisted and screened.

Last edited by back; 10th January 2012 at 08:12 PM.
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