A hammer mill has a flywheel with hammers bolted to it. It runs at a little over 3000 RPMs. Anything that gets in the way of that mass of whirling hammers gets ground up real quick. The material flies through a screen. Material that is too big to go through the screen stays in there and gets beat around u til it is small enough to go through the screen. This all happens in a fraction of a second. This is also why a hammer mill creates more dust and needs a dust collector to separate the dust from the exhausting air. A true simple hammer mill will have a separate fan that sucks the ground material out from under the screen and blows it into a cyclone or dust collector where the material drops out a chute and into a wagon or bags. A more elaborate hammer mill has an auger that augers the feed away from under the screen. So there is less dust involved. I have never used a bur mill but I would think a bur mill would be better for grinding ear corn into cattle feed. Cattle dont like fine powder in their feed.
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Today's Featured Article - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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