With the limited equipment I have in the shop, I've always had problems cutting mitered earners on plywood cabinets. It seems that the veneer is always splitting or the corners don't meet exactly as planned, And because of the thin veneer on the plywood, you can't even sand them flush.
Consequently, I've adopted a corner joint which is very easy to cut, easy to glue and has the appearance of a mitered corner. And it can be sanded to fit perfectly flush with the plywood cabinet sides.
The joint is a half rabbet with a solid wood corner. First I cut a rabbet in the side that's only wide enough to overlap one half of the top piece (this is what I call a half rabbet). Then the cabinet is glued together, without any corner strips.
Jan Pedersen Kamloops, British Columbia
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