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Nonferrous topics such as copper and aluminum, annealing, etc. go here.
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TOPIC: Stranding

Stranding 2 years, 3 months ago #1421

Wish to know the difference between the techniques, machines & application of rigid, tubular, planetary stranding & single twist & double twist bunching!

Re: Stranding 2 years, 3 months ago #1422

Hello cabledesigner,

Such seemingly simple questions result in books of answers and that is not the purpose of this Forum.

If you are indeed serious in learning all this information, I suggest you purchase Electrical Wire Handbook set:

the Nonferrous Wire Handbook set:

and start reading.

Peter J. Stewart-Hay
Stewart-Hay Associates
519 641-3212
Last Edit: 2 years ago by Archived Forum Admin.

Re: Stranding 2 years, 3 months ago #1423

Dear Sir,
Thanks for your reply.

Re: Stranding 2 years, 3 months ago #1424

Hello again cabledesigner,

Unfortunately you misunderstood what I said and I must apologize for that. There was no anger or displeasure in my answer to you and I was not offended by your question in the slightest. Please be clear in that.

However, saying that, the scope of your question is global and would require a tremendous amount of writing to answer. For example, you have not limited your question to the closure of bare or insulated wire, small insulated wires or fibers like telephone cable or optical fiber cable, the closure of large diameter insulated power cable legs, the closure of overhead conductor like ACSR, building wire conductor, Milliken conductor or a multitude of other bare and insulated wire products.

Likewise we just do not know what your experience and training is and again what wire and cable products you are specifically focused on. The fastest and most economical method of obtaining the information you are after however is to purchase the books we already recommended.

It is not the purpose of the WAI Forums to become a training center for readers around the World as there are other venues for that. For example, there are very good technical books as we already pointed out, lots of consultants, seminars and webinars. We are not in competition with them.

For your basic information however:

In general, the planetary machine family includes classical designs (rotating pay-offs), twist compensated drum twisters, twist compensated single and double twist bunchers, planetary quadders and tubular stranders.

Likewise the rigid machine family includes classical designs (rotating pay-offs), drum twisters, twinners, quadders and single and double twist bunchers and stranders.

The difference between rigid and planetary stranding and cabling is the introduced back twist (torsion) in rigid stranding and cabling. Planetary stranding and cabling is often described as "having or with back twist", meaning that the inherent back twist or torsion in rigid stranding has been removed.

S-Z stranding is really a form of rigid stranding (Although some may argue that it is more like tubular stranding.) with regularly sequenced reversals so that the geometric sum of back twists equals essentially zero over the entire length of the cable.

Peter J. Stewart-Hay
Stewart-Hay Associates
519 641-3212

Re: Stranding 2 years, 3 months ago #1425

Dear cabledesigner -
What Peter was referring to in his first reply was your choice to use all CAPITAL letters in your original question. In the internet community, this is the equivalent of shouting at someone (and therefore should not be done unless you are actually angry at someone).

And it is not wrong to ask simple questions. However, it is much more helpful for the readers/responders of these forums to understand what context that you are coming from also - that is, are you involved in Communication Cables? Power Cables? etc... Do you need a specific recommendation? Are you looking for locations to learn more on this topic? As Peter mentions, this question would actually require a full day's worth of discussion to cover all the nuances for every part of the industry.

The Virtual Trade show section of can also point you to the names of various cable machinery manufacturers who you can also contact and pick the brains of.

Erik Macs
VP North American Machinery Sales
Fine International Corporation
148 Oak Street
Natick, MA 01760 USA
508-315-8200 fax: 615-658-1988
This email address is being protected from spambots. You need JavaScript enabled to view it.

Re: Stranding 2 years, 3 months ago #1426

Cable Designer, What may have seemed to you to be a simple question explain the


is a question that covers 5 very different types of machines, and then the techniques, applications and the differences. The answers to this simple question is detailed in books, manuals, and sales literature but it takes hundreds maybe thousands of pages of information.

typically this forum is to help when someone wants to discuss an issue or problem. It is a place to get insight and information not an entire education it wire and cable and the equipment to make it.

that said welcome to the forum.

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