fanning mill
After the thresher separates the grain from the stalk, the winnower sorts and cleans the seeds. It first grades material by size with two (high pass and low pass) screens, then winnows the remaining mate- rial in a vertical winnowing tower. The screen size is selected for the particular crop. The tilt angle of the screens is adjustable, as is the rate and amplitude of the screen shaker. The speed of the; blower is also adjustable. The design uses re-purposed bike parts for the transmission and gears, 12 x 24” screens, and common 1 x 12 and 2 x 4 lumber. The blower is designed for maximum power and inherent turbulence. If finer tuning of the blower is needed (for small seeds) the air inlet can be partially blocked (choked).
on site review 39: Tools 38
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