I like all kinds of machine stories, both the kind where the machine acts on it's own while someone gets in it's way, and the kind where a person with nefarious intentions uses a machine to carry out some plan. Any kind of automated livestock processing plant stories get my interest, as well as milking plant stories where some poor soul gets converted into a producing human cow.
I would add Beast5 stories to the others already mentioned, Milk one of my all time favorites machine stories, but there are a great many others as well.
Jackie.