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Machining Lock Miters on Large Pieces
Question
Forum Responses
From contributor M: If you're looking for a shaper turned on its side, take a look at the Bridgewood BWM 605 single spindle moulder. If you were to mount your tooling and run it with the door open, you could get your 24" piece through it. Although you would have to temporarily defeat the safety switch in order to do it that way, it could be done. It has a 40mm arbor, so it would require something different than shaper tooling, but hey, if you're desperate enough or do it quite often, it may be an option. From contributor C: I have been working on the same problem in order to join corners of tall, plywood wardrobes. I use two routers, each with a lock miter cutter and each with its own custom base, or "sled". The fences on my sleds provide lateral adjustment, and the routers have micro height adjustment (Bosche). The sled with the router spindle perpendicular to the panel (the "easy" cut) is small. It simply helps me start and exit the edge correctly. The sled for the router with its spindle parallel to the panel is wider. As I slide the sled down the edge of the panel, I hold down the "inboard" end to offset the weight of the router as it hangs off the "outboard" end of the sled. With these, I move the tool instead of the panel. Because I am handling something small and controllable, I can make either cut by myself. I clamp a panel to my bench, run the appropriate sled down the edge, and I'm done.
From contributor J: I would suggest buying the Freeborn cutter suggested. I have been using that one for about 10 years and have been very happy with it. One shaper setup, one dado setup for the table saw. Everything run flat, and you control the depth of the groove. From contributor G: I use the Freeborn double t&g miter lock and a power feed. If I have a board that is too wide to fit vertically under the powerfeed's arm, then I bolt the feeder's base out in front of the fence to run those parts. It's a pain, but all you need is 4 more holes in your shaper... not that expensive. The double t&g miter lock is a great joint... once it is set up! Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Have you reviewed the related Knowledge Base areas below? 
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