My first telescoping arm was rather heavy and overcomplicated, while my second was difficult to fabricate and assemble. On that note, I’ve made another go at the telescoping arm, this time trying to make it more practical for use on a real robot.
While not quite as lightweight as the carbon-fiber one, this one clocks in at 15.0lb, which is still much better than the first one I designed. The rope runs and bearing stackups are pretty similar to my first design, with some small modifications to make them simpler to install on a square tube.
Check out the CAD (and more renders) here: https://grabcad.com/library/telescoping-arm-v3-1