Subscribe to Make Magazine Today!

The cord curled in my original project, before reversing. Note right-hand helicity, 19 turns.

Same cord, after reversing the coil. Note left-hand helicity, 21 turns.

One of the first projects I ever wrote for MAKE was about setting a coil in a factory-straight electrical cable or cord using a heat gun and a metal form. A recent comment on that project hipped me to this short video segment from the Science Channel’s awesome show How It’s Made:

In it, a technician in a factory that makes coiled retractable cables demonstrates a second step in the process that I didn’t know about when I wrote my original guide: after the initial “perm,” the coil is reversed by a machine that grabs both ends and twists it in the direction opposite the thermoformed helix. The industrial machine is apparently a bit of a trade secret, but the trick can be performed on a one-off basis using a bench vise and a hand drill.

Besides being a lot of fun to watch, I can now report that this process is a lot of fun to do. And works essentially as advertised on home-curled cords. The “inside out” cord, which started as a regular straight instrument patch cable, is now considerably tighter than before.

Thanks to Bart Patrzalek for the tip, and Brian Adams for linking to the instructive video segment.

Make: Projects — Cord Curling Part 2 – Reversing the Coil

Sean Michael Ragan

Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and My work has also appeared in ReadyMade, c’t – Magazin für Computertechnik, and The Wall Street Journal.

2 Responses to Revisited: Cord Curling – Part 2, Reversing the Coil

Your Thoughts?

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

  1. Thanks for the mention in the post! Just to let you know, my last name is misspelled tho.

    • Sean Ragan on said:

      Woops! Sorry, Bart. Think I’ve fixed it here, now, and everywhere else I wrote it. Let me know if you see it wrong again.

Related Supplies at Maker Shed