So, I thought to turn the hobby into its own learning project.
Looking around at home metalworking equipment, I don't see anything that does Electro Discharge Machining (EDM). EDM is a very flexible way to manufacture nearly arbitrary shapes in almost any electrically conductive material. It requires electronics (no problem), computer programming (no problem), space (no problem), and mechanical construction (maybe a problem).
Unlike cutting metal with grinders or tungsten-carbide cutting tools, the mechanical forces are more limited. This means that I am more likely to be able to build something that is accurate enough to be useful.
I'm investigating ... and investigating. It may come to nothing, but it is a good organizing principal to use for exploring.
I have a project! A Stewart Platform. A Stewart Platform is a 6 degree of freedom positioning device which is better than standard X/Y/Z tables and gantries because the loads are all either tension or compression -- no bending forces are applied to the actuators.
Follow the Stewart Platform progress from the projects page.
I've gotten some new tools: