www.flyhouse.com: Dead wraps are wraps of the wire rope around a drum that provide an anchor for the wire rope to the drum. The industry standard has always been three dead wraps, but why is that? Flyhouse went to the shop to test different numbers of wraps on the drum to see how much of the load gets transferred from the wire rope to the termination to get an answer.
2 comments:
I’ll be honest, I wanted to see something break. I appreciate seeing things I learn in class, physics, in this case, being shown in real life. It was interesting to see the different readouts of the load cell especially when the load cell read 2.5#. This makes complete sense especially after just finishing the lesson on friction and wrap friction in physics. What was slightly frustrating about the video is that we didn’t actually see the test. We saw the important part which was the final readout, but I was kind of hoping to see the readout actually change and watch the cable get pulled. It’s not a big deal but it would have been cool. I also think it is important for everyone to see cable break. We are so used to using cable and at least I have never seen any catastrophic cable failure in real life, but it's important to remember that it does happen and by watching it, even on YouTube, I feel as though I have a better understanding and respect for how important it is to use the right cable. This logic also applies to seeing dead wraps and I am glad that this video reaffirmed my belief in 3+ dead wraps.
But now I'm going to go watch videos of cable destructive testing.
You want cables breaking - you got it!
http://www.flyhouse.com/blog/stop-sleeves-and-oval-compression-sleeves-video
http://www.flyhouse.com/blog/why-did-the-zip-line-break-video
http://www.flyhouse.com/blog/lighting-safety-cables-video
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