Figure 6-26. (A) A tongue or a tenon is formed on the edge of stock by making two rabbet cuts. (B) Tongues or tenons on the end of stock are done this way. Always use a fence extension to provide support.
Tongues and tenons are made on the edge and end of stock in the same manner as that described in “Edge Rabbeting.” The difference is that the first cut is followed by a second one that is made after the stock has been turned around (Figure 6-26). The thickness of the tongue or tenon will be the stock thickness minus two times the width of the cut. Length, as in rabbeting, is controlled by the depth of cut.
When a tongue or tenon is located across the end grain, you must use a fence extension for additional support. Chip out is a problem with end grain jointing, so you'll need to make light passes and form the tongues or tenons before jointing the edges of the stock.