I have a 1.5mm diameter wire that must be pulled against the corner of a surface. The wire is made of stainless steel and coated with polyamide.

What is the ideal material to make corner of the surface in order to:

  • reduce wear of the wire (easier to replace the surface) but without being worn out too quickly
  • low friction
  • ideally easy to machine / source


  • $\begingroup$ I had a look at makeitfrom.com but am not sure how to start evaluating options, and hoped an expert could point me at a few options. :) $\endgroup$
    – John
    May 20, 2022 at 10:42
  • 1
    $\begingroup$ Can you just put an idler pulley there? Even if you need to make a tiny one with a pin or rod. $\endgroup$
    – DKNguyen
    May 20, 2022 at 13:36
  • 2
    $\begingroup$ Increase the radius of the curvature. The stainless will cold wok quickly running over a small radius. $\endgroup$ May 20, 2022 at 13:49
  • $\begingroup$ I can't reduce the radius or put a pulley there as the wire must exit from the same point. Weird design constraint, I know! $\endgroup$
    – John
    May 20, 2022 at 14:48
  • 1
    $\begingroup$ @John Nylon is a polyamide. I'm essentially saying use the same material that coats the wire because the material that coats the wire is so soft to begin with and anything harder will wear the rope faster than it needs to. I looked into it and it seems teflon is softer than nylon so the teflon would wear preferentially in that case over the rope but it might be too soft. The friction of nylon on nylon is so low to begin with that I don't think the low friction of teflon is that much benefit because teflon is a lot more expensive. You could also try looking into olefin (heatshrink film). $\endgroup$
    – DKNguyen
    May 22, 2022 at 16:04


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