My project at the moment is to try to make a mechanical watch. The concept is that it will only have one hand (the hour hand), and the mainspring barrel will e

My project at the moment is to try to make a mechanical watch. The concept is that it will only have one hand (the hour hand), and the mainspring barrel will encircle the entire movement, you'll wind it up by rotating the bezel (and therefore the outer part of the barrel) clockwise, and the mainspring will drive the inner barrel clockwise. The hour hand is mounted directly on the inner barrel (which therefore completes 1 revolution per 12 hours), and the rest of the movement only exists to regulate the speed at which the inner barrel rotates. So the rest of the movement will be a series of gearings-down, with an escapement at the end. And to set the time, the movement will be mounted into the case with a ratchet, such that when you turn the bezel anticlockwise, the entire movement (and therefore the hand) rotates anticlockwise allowing you to set the hand. You'll only be able to set it as precisely as the ratchet (i.e. you'd need 720 positions of the ratchet to set it to 1-minute precision), but the watch will never keep particularly good time anyway so I don't think this is a problem. Yesterday I got an escapement at almost-watch-scale ticking for the first time, albeit erratically and requiring enormous drive torque: https://www.youtube.com/watch?v=xvNODOp6uBc https://www.youtube.com/watch?v=xvNODOp6uBc (3d printed for expediency, the real one will all be machined; and I say "almost-watch-scale" because although it fits inside the 50mm diameter that I am aiming for, it is obviously too thick to go inside a sensible watch). I have more info in this post: https://incoherency.co.uk/blog/stories/the-watch-project.html https://incoherency.co.uk/blog/stories/the-watch-project.htm...