I have tried several models of flow through systems and continue to tinker to get the results I’m looking for. The idea is for the finished castings to fall through the grate at the bottom of the bin and the worms to work towards the top of the bin.
Materials: square metal tubing, plywood, braided cable, 1.5″ self tapping metal screws, small I beam we found for the base bar to mount winches, and 2 winches (one we salvaged and another from Tractor Supply @$20) for pulling each direction.
We welded a bar to slide along the bottom of the bin to agitate the castings through the grate. I have tried other versions without the cutting bar, and castings tend to get clumpy and stuck. Stay tuned for the big reveal when we add worms and a few finishing touches.