On Machinetools.... . I worked my whole live in machineshops all over the Western World and upon retirement I find that actually manufacturing something yourself is quite different from managing it or talking about it. I limit myself to the technology from about the 1960's. So a lathe, a mill and a drill. And a bandsaw because it is faster and much more precise than sawing by hand. Being able to use the bandsaw vertical with a narrow blade vastly expands its usefulness. Upon making small stuff you are limited by the spindle speeds of the machinetools available to the amateur, say 2000 revs, sometimes 4000 revs. So I got a TAIG lathe which I drive with a 40 Volt DC motor, revs controlled between 30 and 6.000 revs. With the TAIG pulley set-up 3:1:3 this gives a very useful speed range from 10 to 18.000 revs - you can finally drill a decent 0,5 mm hole in a 1 mm shaft, and then slowly controlled tap it! For semi-finishing I use very simple horizontal and vertical band/disc sanders. And as soon as the cutting tooling becomes more complex you start considering a toolgrinder. The next step is controlled heat treatment. For HSS this means an oven that goes up to 1200 -1300 degrees Celsius, a second oven that goes up to 500 - 600 degrees Celsius for the second step and for the third step a simple small oven up to 200 degrees Celsius if you want to avoid discussion over the use of the oven in the kitchen.
My machineshop is at the back of the big shed in the garden. Problem is rust: in the morning the metal mass of the machinetools stays longer cold then the surrounding air which results in surface rust everywhere. I successfully fight this with an electric dehumidifier and with floor heating. The discussion why floor heating in the machineshop was necessary, but too expensive for the master-bathroom, was also heated.