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What stops the seeds from going up the vacuum?

@@andysavage2361 The seeds are heavier than that chaff and other material in the mix. You adjust the airflow so that the seeds tumble down the left column and the lighter chaff gets vacuumed off and to the right side. You can have too much airflow and vacuum seeds, chaff and everything into the right, large chamber. However, due that the right chamber is large and is sealed at the bottom, the material in the right chamber settles to the bottom and the air is drawn into the vacuum. If you find a lot of your desirable seeds in the right chamber, turn off the vacuum, open the bottom of the right chamber, drain everything out, readjust the air flow (open move air holes at the top of the right chamber or, if you have a variable speed control on your vacuum (my old Craftsman vacuum does), you can slow the vacuum) and now rerun the same material. The beauty of this system is that you do not typically waste any of what you are cleaning if you pull too much of what you are trying to separate. You just change your air flow setting and rerun it, as many times as you want. I am using mine for separating cracked black walnuts. For some black walnut varieties it does GREAT. I typically run them two or three times. Hope this helps! Good luck if you decide to build one.

@@nutgrower2957 I’m thinking about using this method for coffee de-stoning.

@@andysavage2361 I assume the stones would be the denser part of the mix you are separating and would go down the left side? The coffee beans would end up in the larger chamber on the right side. Adjusting the air will determine if some of the lighter beans go into the vacuum. The big difference in density of the stones and the coffee beans should make this machine super easy to calibrate and no beans should go into the vacuum.