i hold few left tendencies in more contempt than anprims. industry and human ingenuity gave us the CASE axial-flow combine and 45 foot grain header for a reason.
god my friend explained how an axial-flow combine worked a while back and i was just kicking the floor and yelling for an hour
mostly i get Like This about large-scale chemical processes and everything Norman Borlaug ever did but it's all connected anyways aaaaaaaaa
i'm a fucking poser and don't actually know how the older kind of combine harvester *actually* works offhand - 'axial flow' because the threshing action is done by passing the grain through a bigass cylindrical rotor, which is way the shit faster/higher bandwidth than... whatever we used before that
before IH came up with the big drum that gives the case-ih axial-flow its name there were a bunch of designs that used basically a series of "walking" sieves or shaker plates