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 - History of the Nuffield Tractor: Part 2 - by Anthony West. In February 1953 production of the ETC T.V.O engine started, ready for the March 1953 press announcements. The new TVO engine had a number of improvements which resulted in a 10 per cent more power (43bhp as against 38 bhp on the earlier engine) and 10 per cent more fuel economy. Some of the improvements are listed below: Redesigned combustion chamber, improved spark plugs and positioning, plug size 14mm(earlier size 18mm).
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