This may not be generally practical, but just to get a prototype working I'm surprised they didn't employ gravity. The vacuum wasn't strong enough to lift the c

This may not be generally practical, but just to get a prototype working I'm surprised they didn't employ gravity. The vacuum wasn't strong enough to lift the cob debris up 5-10' to the top of the hammer mill, but it certainly could have pulled it out of the bottom of an elevated tub grinder and down to a lower hammer mill.