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Peanut Butter Box

A locked box for tempting goodies


We all have something that challenges our willpower, right? A food that keeps calling you back. Maybe it's coffee, candy, potato chips, or cake. For my wife, it's peanut butter. She requested I make a locked box for our peanut butter in order to "encourage a healthier amount of peanut butter consumption."


For no particular reason, I wanted to include a slight Asian influence to the design. I can't say it's a properly informed influence, so no offense intended. As an added experiment, I wanted to design and build this project using metric measurements.


I thought Black Walnut sides would look nice with Maple corner posts. I planned for Birch plywood for the top and bottom, because I had it on hand.


3d illustration of the box design

It's worth noting there's a bit more than meets the eye here. All the side panels (including in the lid) have mortise and tenon joints into the corner posts, as illustrated in this image.


transparent 3d illustration showing joinery inside the corners of the box

I knew there was going to be plenty of tricky cutting, fitting, and joining for this project, so I made some rough plans for myself.



I actually have a few in-progress pictures of this project!



I decided to make the hinge a feature, since I needed to solve the issue of the corner posts interfering with a normal hinge anyway. I decided to make a hinge using a solid brass rod, and a couple brackets on either side, which trap the rod inside. Illustrated below.


transparent 3d illustration showing the brass rod inside the hinge

The design intricacies made this project quite labor-intensive in the end, between the joinery, the tapered legs, and the hinge, but I'm happy with how it turned out. We've been using it for over a year and a half now to safeguard peanut butter, and it works just as well as the day I made it.



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