As I have mentioned, I am building a knock-down bookcase for my youngest daughter who will be leaving soon for the Coast Guard. Hence the reason for knock-down as she will probably be moving a time or two in the next six years. The shelves all needed through tenons on each end. After some thought on how to get nice accurate tenons on the end of 30 inch shelves this is what I came up with. The jig is a combination of my panel cutting sled and a fence that I had constructed for another jig. It worked great.
Bob