There are all kinds of commercially available jigs and tools to assist in making box joints (or dovetails) but I made my own jig quickly and easily with the router table at TechShop and some scrap wood.
Tools needed:
Router table and a 1/4" straight bit
Compound miter saw or table saw
Planer/Joiner*
Belt sander*
Straight file
Some clamps
*optional
Materials:
3-4" wide board
Scrap board
I made it at TechShop!
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Signing UpStep 1: Prepare the sides
Cut four sides. Label each piece lightly in pencil: front, back, left and right. It helps to put the label at the top of each piece to aid in orientation later.
If it helps, lay them out in the way they will be assembled.










































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http://www.routerworkshop.com/boxjoints.html
http://www.instructables.com/id/How-to-Make-a-Box-Joint-Box/
We did it by cutting several vertical lines between each finger to remove as much of the wood as possible using a backsaw then we chiseled away what was left.
It was laborious but pretty effective and I got some very tight and accurate joints.
Hope this could help.
The vikings and the celts used a much simplified version which only had one or two straight tongues but that is the closest you come to old school.
Though it is actually pretty easy to make them on your own, though you'll need practice to make it look as good as Roy.
In a small box, this doesn't matter, but if you scale up you'll see cracking or warping if you glue the bottom to the sides.