Here are pics of my drawings of one I plan to build.
I finally got around to building a separator, but decided not to use the barrel I designed for originally. It was too large and tall for the area I wanted it to sit in. Instead, I bought a 20 gallon metal trashcan. With my circle jig, I routed a .25" deep dado in .75" plywood with an inside diameter equal to the inside diameter of the top of the trashcan. I then used the router and jig to cut the plywood to an outside diameter slightly larger than the outside diameter of the trashcan.
This resulted in a top with a recessed lip that allowed the top to seat inside the trashcan for a fairly tight seal. I routed the outlet (center) and inlet holes with the same router jig set to 2.5". The inlet hole was set .75" inside the dado.
Since I needed the elbow to not project any more than necessary into the can, I enlarged the diameter of the inlet hole and slightly relieved one side of the lip so that the elbow could be seated as deeply as possible into the hole. I then determined the amount of clearance required (3.75") for the elbow I bought from Lee Valley, and progressively routed the .25" hardboard in 1/8" steps until the partition rested on the inside of the trashcan 3.75" below the top of the can. The partition was cut from a piece that was slightly narrower than required, and offset from the center so there was a gap between the partition and the can wall that I could use to hold the partition.
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