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Ramped Halving Joint

675 Views 2 Replies 2 Participants Last post by  4DThinker
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I often helped my students make half lap joints in panels that slid together in their furniture designs. Usually we'd rough cut the slots in each half with a jig saw, then use a router and a clamped on straight edge to finish the smooth sides of the slots. When the panels started being cut using a large CNC the slots were also cut on the CNC with results that varied from sloppy to difficult to assemble.

I came up with a ramped version that could be CNC cut that was easy to slide together but would come snuggly together when closed.
Brown Rectangle Wood Packing materials Shipping box

Both sides are cut using the same toolpaths. The notch has a tapered side that matches the ramped face on the opposite side. I've posted a longer story HERE. There is a link to Vectric's forum where I posted a sample CNC file.
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Ramped slot looks like it would be very stable laterally. Interesting use of CNC.
Ramped slot looks like it would be very stable laterally. Interesting use of CNC.
They do help, especially in thinner plywood that can flex somewhat. For several years that I've owned a CNC I've envisioned a more complex 2-sided version that would "trap" the plywood that extends past the center of the joint. Never tested it as it still demands the boards to friction slide against each other to close up. This ramping version of a halving joint, along with slightly tapered French dovetail connections have made putting together casegood furniture far easier.
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