Bob, I enjoyed your video entitled “Lock Rabbet Joint”. Please explain the rationale for making the initial dado “a hair” deeper than 1/4″ and when placing the fence from the blade using the stock, the blade tip should be just “proud” of the stock. Thanks.
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The dado is just a hair deeper than the length of the tongue- That is so the joint will be sure to close up on the shoulder of the rabbett rather than that shoulder being held of because the tongue is bottoming out in the dado. That will also help make sure the box glues up square.
The blade tip is set just proud of the thickness of the stock. That will make the end of the "dado" piece just proud of the face of the adjacent "rabbett" piece. That end grain is simple to flush up with a block plane. If everything always came out "perfect" then you would set the blade tip exactly flush with the thickness of the stock- but they kicked me out of that "perfect" world a long time ago!!
Bob Van Dyke
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