I think the stencil marks on my old hammer mill indicate 2200-3300RPM. It was originally flat belt driven. I converted it to PTO with a drive taken off an MC grain dryer which was converted to electric motor. I can't tell you the size of the pulleys without measuring them. It takes a 1000 RPM PTO to achieve speed. If I want a coarse grind, or to just crack grain, running much slower works, but the blower part then can't develop enough draw to take the material away. I think if it was set up so the material could just fall away by gravity, it would work.
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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