Jun 4, 2019
You thought that we finally learned from our mistakes and abandoned this podcast, and you thought wrong. Once again it's time to lower your standards, and enjoy a new episode of the CBA Podcast.
We start with some PCB failures and flaws, followed by a very brief review of the Hackalot lasercutter & vinylcutter workshop. We attended T-DOSE, which is a Dutch open source event hosted in Eindhoven.
Then for something slightly out of the ordinary, we talk about back-of-envelope calculations about whether a climbing-rope can actually break if I fall. (Spoiler alert: it cannot.)
Some clarifications and errata about this climbing-rope segment:
To calculate maximum force on the rope, I used the harmonic oscillator formula given here , where the actual force is calculated from fall factor, mass of object, but also the rope's rated impact force. (I forgot to mention that).
Also, I made an error: I mentioned a maximum actual force of approximately 85% the rope's rated impact force, but this is in fact less than 70% - nice.
For those special people who like this: standard EN 892 deals with dynamic ropes like the one discussed, and EN12277 deals with harnesses ("belts"). My harness is tested with a sustained load of 15 kN. The type of carabiner I use is rated for 27 kN load.
Finally, some relevant links: