Final Arkansas Workshop Exercise – A Cypress Water Stone Box
For a final exercise for the Arkansas workshop participants I recalled back many years to a dovetailed, waterproof box I built three decades ago. I found it to be a challenging and instructive project for me then and figured it would be the same for the others now. And, I had just the right stash of 180-years old cypress to use as the material.
I tried to find my original box but it has disappeared somewhere in the maelstrom of recent years. No doubt I will stumble across it immediately after returning home. So, I made another one to give the students a prototype to follow.
The first things was to resaw some of my prized cypress to obtain enough 3/4″ stock for the sides and 1/2″ stock for the bottom. Vintage select-grade cypress saws and planes like a dream, filling the room with the appealing and cloying scent of the wood Some folks tell me it smells a little bit like a hippie chick wearing too much patchouli oil, but I like the scent myself (and the smell of patchouli in moderation) even if it does pull on my throat a bit.
I planed and sawed the boards in the usual manner, cutting the dovetails pretty tightly. Cypress is a bit “springy” so a tight fit is achievable. The bottom was made with a tight tongue and groove joint, with the panel chamfered and fitted tightly into a continuous dado cut with a plow plane. I assembled the whole thing using brass screws through the dovetails to hold everything tight.
If I built it well enough I can soak it is water to swell the wood and render the box waterproof, a la a hot tub, and it can serve to hold my water stones. A frame-and-panel lid will complete the project, probably after the workshop.
Any time I read about waterproof boxes, I think of the Frank Klausz video that’s so old I watched it on VHS where he shows his technique.
Basically, he takes a thick wire and taps it along where he wants to make a waterproof seam, compressing the wood fibers in that line. Then he planes the rest of the surface (best to do this on the edge) down to the same level as the compressed wood. When water hits that compressed line, it swells back up and creates the water-tight seal.