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Last Summer a coworker and I were doing a job where we had to enclose an unsightly beam with a finished ‘false beam’. Since there was hardware (bolt heads, etc.) protruding from the original beam, we were not able to attach anything to the sides, only to the bottom and top where the beam met the ceiling. The new material that we used was a 1/2″ high grade roughsawn plywood (no plugs or voids). Along the length of this, where each side piece met the bottom piece, my buddy created a modified 45deg. joint. He did this on the table saw and I guess I could best describe it as an abbreviated mitre lock. The pieces were glued with polyurethane and clamped, and due to the configuration of this joint there was no movement or slippage at all while the glue set up- it ‘locked’. It seems that this is an excellent solution for plywood when backing cannot be used at a 90deg. corner. I have also become aware of a shaping bit called a ‘mitre lock’. Has anyone used this bit or similar technique to the above?
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Check out your library for issue 12/2000 of Popular Woodworking magazine. There is quite a good article there on these bits.
An abstract of the article from their web site:
A technique article explaining how to make quadralinear (sometimes spelled quadrilinear) posts, which are a common feature of Arts & Crafts furniture. Article explains how to cut these joints using a lock miter bit and a router in a router table. The article also shows you how to build a Frank Lloyd Wright-style hall tree using these posts. Complete instructions, photos, drawings and a cutting list are provided.