I’m working on a video that details the whole process of instrumenting and building the power meter as well as explaining the concepts. I’m starting from scratch in the video. How power is calculated, how rotational velocity measured, and most importantly, and in-depth, how torque is measured via strain gauges as well as how a strain gauge works. Below are some screenshots of the upcoming video. Currently I’m planning on shooting the table top demo of V3 and the on bike video to conclude the raw footage capture Sunday (Jan 13th, 2013). I might have it edited together in the evening for posting Monday or Tuesday.
Overview. More pictures after the break.
How strain gauges work on a whiteboard.
How cadence measure works.
How to measure a strain gauge with some background.
How to install strain gauges.