I recently built a wall mounted shelving using interlocking dado joinery. I don't have a picture of the finished product yet but will post one later after the finish has dried. What I do have are a couple of pics of the miniature prototype I first built to confirm the design....those are attached below.
The problem I encountered with the interlocking dados are small gaps, clearly visible in the assembled proto. I was able to tighten up the dado cuts on the final piece, but was unable to eliminate the gaps completely without making the joints so tight that I had to dead hammer them together, which caused some visible scrape marks on the boards. The initial project was paint grade so the presence of wood filler was not a problem. I'm now preparing to build several similar design stain grade shelves and am looking for advice on possible alternative methods of joinery that would completely eliminate the gaps, or suggestions on how to modify the interlocking dado method to reduce or eliminate the gaps (without having to hammer the pieces together).
Here are 2 pics showing the joinery and the gaps....please keep in mind this was a miniature proto-build and not the finished product: