3 ms·

Anyone know why the "WRONG" example in this diagram is bad? https://i1.wp.com/cdn.makezine.com/uploads/2009/07/cablelacing6b.gif https://i1.wp.com/cdn.makezine

• esaym 7y ago
  A marline hitch vs. a half hitch: https://en.wikipedia.org/wiki/List_of_hitch_knots https://en.wikipedia.org/wiki/List_of_hitch_knots
• pbhjpbhj 7y ago
  I think it's a knotting thing, the A knots will slip as you try to hold it fast - the knot will move down the page initially. The way the cord presses the earlier piece down in B means the knot won't move [so easily] as you hold it under tension.
  • Groxx 7y ago
    Don't they both press down though? One presses down on the loop ends (A), the other presses down on the strand between loops (B). The more I try to figure out why B would be better, the more it feels like pressing down on the loops would be better (ensuring more of the loop is in contact with the thing being wrapped). e.g. https://www.dropbox.com/s/ghu5f8m1nsu7kve/wrapping.jpg https://www.dropbox.com/s/ghu5f8m1nsu7kve/wrapping.jpg Exaggerated, sure, but still feels odd.
    • mtreis86 7y ago
      No, the A knot has the down-the-cable runs overlapping the around-the-cable loops. Which means if one of the down-the-cable runs lets go, it loses tension on the next. In B, since the around-the-cable loops are overlapping the down-the-cable, if tension is lost at one end there is less tension lost at the next step. The friction in A when the end is loose is much less than the friction in B, due to the entry point in B being under pressure of the loop around the cable.
      • deleted 7y ago
        [deleted]
      • Groxx 7y ago
        Aaaah, yea, that does make sense. The loop pinches both ends, so a loose end doesn't matter as much. Sorta requires the knot to be pressed against something, but that's probably frequent enough in practice / can be designed for (e.g. a knot that's bigger than the gap between things it's wrapping). Thanks!