Grain vacuum.
Previously:
Combine filling a grain bin - GIF
Conveyor belt from grain harvester - video
Grain bin collapses - GIF
Grain bin collapses and explodes - video
Grain silo explosion - GIF
Grain weevil silo safety robot - GIF
Rice grain sculpture - GIF
Unloading grain from a ship - GIF
Vacuuming spilled grain - GIF
New plans added on 09/16: Click here for 2,461 plans for homemade tools.
I"m sure that's a screw device...
A similar tool is used by fire departments to rescue people trapped in grain bins. It's more of an auger than a vacuum.
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