I had some local birch handy and here is what I came up with:
And in action for the first time:
As you can see, I cut it a little close on the rough sizing. But it all worked out fine. Plane the reference edge square and true, mark one side, flip the panel end-for-end, and using the same reference edge mark the other side. The cutter on the gauge makes a clean cut which was easy to see as I plane the second edge down to size. I'll post about this technique later, but basically I just plane down until the marks dissapear from the edge - a lot easier to show than write about - I'll work up that post soon...
It works great, but one improvement for any future version will be to move the trapped wedge to the side rather than on the top of the beam. With the wedge on top, it adjusts for slop vertically, which is rather unimportant since both the fence and the cutter are supported by the panel being marked (the bottom front edge of the fence is rabbited). I would prefer to have the wedge taking up slop (both from seasonal movement and my errors on cutting the mortice) in the horizontal plane. I think this would make for a more secure fit and more effectively resist the lateral forces that occur in use. Oh well, next time...
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