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Well then you'd probably be fine all the way back to premodern times, assuming you can convince clients to trust you with their mine water pump or whatever. As long as you could get along without devoted replacement parts.
Once you reach that point, the modern lathe thing becomes an issue, a commercial foundry might not be around for cast parts, and the technology to cast ferrous metals at all isn't guarenteed. The ability to perfectly eyeball things and use relatively primitive materials becomes a major constraint. If you master that, you can probably hack it all the way back to early civilisation building crossbows or animal-powered pumps.