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One of the ways I try to sell my trade to students, is telling them how important it is for the world. Machining, welding, plumbing, carpentry and so on. All of it would be primus motor to get society back.
Yes! The importance of craftsmen is hard to overstate😀 Along with a few others, of course!
Step one is likely to be making one of those concrete lathes and use it to make other machine tools. Might have to use human power to run it, though.
I think, that I might find a better alternative. Like scrap, granite and cast iron.
In a pinch, make a bow drill style lathe using a branch and a rope.
The thing about concrete in a situation like that, though, is it is relatively easy to make new material for construction. That lathe was designed specifically for people to make when they've got nothing else and get some actual decent accuracy.
Also, flip it on its end and you have a drill press to put that scrap together with.