I have limited resaw capability in my in-between work space so I concocted these out of scraps.
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I've posted about these shop made stop blocks before. They are handy for repeated cuts of different lengths.
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With thte miters cut I run a 50T blade with an FTG raker to cut 1/8" x 1/8" grooves for top bottom and inserts tray supports.
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I find some oak scraps that are thin enough and wide enough to use for veneers on a plywood substrate for the bottoms.
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I cut the bottoms to size and mill a tongue all the way around, same for the tops.
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You can see some of the joinery here. The tops are done with a router technique I saw on a MCM cabinet with bypass doors years ago.
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I've reached the photo limit so what more can I say . . . I finish the insides of the box and the complete top and bottom before assembly. I use masking tape oin the inside to control squeeze-out and packing tape on the outside to hold the sides until I get it in the clamps.
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Smaller boxes use just the packing tape. A about 8X5 these call for clamps.
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The top will be cut off about an inch down, hinges and a pull added along with an insert tray.