I built a vacuum de-hulling machine based on an YouTube Video.
That one they introduce works not so well.
- The Vacuum Cleaner they use is overkill
- You need to have a freezer box with lid (Tupperware or so) first and shake the seeds for a while to loosen the hulls from the actual seeds.
- The Ventilation lid needed a bit of "fine tuning" but finally I can clean my quinoa, amaranth and sorghum seeds to at least 95%.
- the drop shaft can have more steps and also
should be longer..
https://www.youtube.com/watch?v=u4c1-ajSILA
...a good and successful farmer has a spot behind the barn where lots of scrap pieces laying around, that are actually failed improvements to make the farm work easier... (True words)