Using a Cross Cut Sled to make Box Joints

Things you will need:
A Table Saw with a DADO Blade.
A Cross Cut Sled
A 3/8” X 3/8” X 1” hardwood Index Stop
Enough 3/8” X the height box desired stock to make a box the dimension desired.
Instructions:

Cut the stock into 4 pieces. The stock should be cut into lengths of 2 ea for the sides and 2 ea for the ends. These should be the outside lengths of your box. Set the DADO blade up to cut a 3/8” groove. Cut a kerf in the sled floor with the DADO Blade. Install the 3/8” X 3/8” X 1” index stop exactly 3/8”away from and parallel to the kerf, to the right of the blade on the floor of the sled. Set up the height by adjusting the DADO Blade to the height of the sled floor plus 3/8”. You can lay a piece of your 3/8 stock on the sled and bring the blade up until it is even with the top of the stock.

Flip the stock over and repeat on the other end. Do both side pieces the same way. Then cut the ends. This time start by setting the stock tight next to the index stop.

This will offset the end cuts on the end pieces by 3/8” which enables the joints to align.