The Diamond Tenon

This is one of the first through tenons, with locking wedges, that we cut. There are six of them, in a very visible location along the gallery in the Vermont Building. The tenons are on the end of forty six foot long 12 x 14’s so they deserved to be big. One of my joinery rules of thumb is that you ought to be able to drop a timber off a fork truck without having to worry that the tenons might break off. With some persuasion, I talked the crew into not just making the tenon a rectangular cross section, but a polygon. There is, even, some structural justification for the thickened tenon around the wedge aperture – but not much.

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