This instructable is for a box joint jig, which is necessary for this particular carpentry technique. I made it at TechShop in Menlo Park (http://techshop.ws
). I needed this tool so I could create a box joint (also sometimes called a finger joint) using the dado stack bit on the sawstop table saw.
A jig is needed to easily cut 1/2" "fingers" and equally sized spaces in the end of a board. Using this tool will make those cuts clean and efficient.
The box joint is an alternative to the more popular dovetail joint. An interesting point that the box joint is stronger than the dovetail joint, and does not require the custom dovetail jig. Instead, you can create this one with scraps and belt out box joints all day long. Strength test was done at http://woodgears.ca/dovetail/index.html