That's great that you managed to build a working device from these plans! So the machine doesn't require suction to pull out the hulled oats/chaff mixture, it will blow it out of the outlet itself? From the drawings it looks like a lot will fall to the bottom and be trapped? Or do the fins on the cylinder move enough air to lift it.
You call it a "cylinder" which brings to mind a combine cylinder and its "beating" action. Does this work by contact or does it work by impact (throwing the grains into the stator)?
Thanks for getting back to me and it will be great to see photos/video of the entire machine. When you say the finished product could be used for oatmeal, I assume it is still whole groats and would need to be cut/broken to cook? Or is there a large proportion of broken groats?