Dado indexing jig and method of cutting a dado

A dada indexing jig comprising:

• a base having a back surface to abut a movable fence on a woodworking table, the fence being adjustable with respect to a saw blade;
• a first indexing member integrally formed with the base and is not adjustable, the first indexing member has a first side and a second side, the second side parallel to the first side, wherein the first and second sides are both perpendicular to the back surface of the base, the first indexing member further having an end with an end surface that is parallel to the back surface of the base, the end, first side, and second side of the first indexing member and the base defining a periphery;
• a second indexing member connected in sliding engagement to the base and adjacent to the first side of the first indexing member, and the second indexing member has an end outside the periphery, the end of the second indexing member further having an end surface that is parallel to the back surface of the base;
• wherein the end of the second indexing member is adjustable to a position where the distance from the end surface of the second indexing member to the back surface is greater than the distance from the end surface of first indexing member to the back surface to define a width of the saw blade, and wherein the end of the first indexing member and the end of the second indexing member are each adjustable to respective positions adjacent to a saw blade of the woodworking table for making a first cut in a workpiece by positioning the movable fence relative to the saw blade;
• and,
• a third indexing member connected in sliding engagement to the base and adjacent to the second side of the first indexing member, the third indexing member has an end outside the periphery with an end surface that is parallel to the back surface of the base, and the end of the third indexing member is adjustable to a position where the distance from the end surface of the first indexing member to the back surface is greater than the distance from the end surface of third indexing member to the back surface for making a second cut in the workpiece, wherein the first cut and second cut define a width of a dado to be cut in the workpiece.

A dado indexing jig comprising:

• a base comprising a vertical section connected to a horizontal section, the vertical section having a back surface to abut a fence on a woodworking table, the vertical section further having a channel along the back surface to receive a clamp with a clamp arm insertable within the channel to detachably secure the base to be to the fence;
• a first indexing member fixed to the base, and the first indexing member has a first side that is parallel to a second side thereof, wherein the first and second sides are both perpendicular to the back surface of the base, and the first indexing member has an end with an end surface that is parallel to the back surface of the base, the first indexing member is adjusted by adjusting a position of the fence relative to a saw blade;
• a second indexing member connected in sliding engagement to the horizontal section of the base and adjacent to the first side of the first indexing member, and the second indexing member has an end with an end surface that is parallel to the back surface of the base;
• wherein the end of the first indexing member and the end of the second indexing member are each adjustable relative to one another to define a width of a saw blade of the woodworking table for making a first cut in a workpiece;
• and,
• a third indexing member connected in sliding engagement to the horizontal section of the base and adjacent to the second side of the first indexing member, the third indexing member having an end with an end surface that is parallel to the back surface of the base, and the end of the third indexing member is adjustable to a position relative to the end of the second indexing member defining a width of a dado to be cut in the workpiece.