Domino Joint and wood movement

simnick

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Nov 12, 2019
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Dominos make wood joinery so easy that is can be easy to build something that one shouldn't. I was just about to put something together when I realized I probably shouldn't, and wanted some opinions to make it work(rather than starting over).

I'm building a tool cabinet for my height adjustable workbench. I built the carcasse of the cabinet out of plywood, including the top out some nice scrap walnut plywood. I was going to build drawers accessible from front and back, but in order to make them large enough to fit two systainers deep, I had to switch to drawers accessible only from the front. I already made solid walnut panel glue ups for front and back that I was going to rip for grain-matched drawer fronts.

I was going to attach the rear natural wood panel to the back of the carcasse with dominos, but I realized the plywood and the panel would have differential wood movement, and the panel or dominos would eventually break. Any advise for attaching the panel that would provide some racking strength, yet allow for wood movement? I was thinking glued dominos along the top edge (as that is the edge that needs to be flush), and then loose (no glue) dominos oriented vertically lower down. But I want to keep the panel flush. Should I do something like table buttons / z clips? I also have the DF500 connector set, maybe I could repurpose something from there?

Ideally the back panel would be a frame and panel design, or made of plywood, but it is a bit late in the game to change that.
 

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Can you put a vertical cleat behind the drawers, either side, and screw through it with the appropriate clearance hole, to allow movement. Dominos across the top.
 
With wide panels like that, ply and solid wood do not play well together.
I realize that you are in pretty deep at this point, but I would consider cutting that panel down some and trapping it inside a frame.  You could even keep the thickness by rabbeting from both faces to leave a tongue, then cut a groove in the frame to house it. Leave 1/8" (3mm) or so gap around it and you're good to go.
 
Crazyraceguy, you are probably right, I should do frame and panel. I was going to have a frame around the drawers in front as well, so with a few tweaks, I can probably make it look more uniform on front and back.

I will domino the stiles to the plywood top and bottom, and let the panel float inside.
 
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