This T-guide adjusts so you can rout a sliding dovetail slot that is slightly wider at one end, such as for the rear of bookcase ends. The tapered slot allows easier insertion of the dovetail cleat but does not compromise the integrity of the joint. Construction of the guide is straightforward, as shown above. For the adjustment action, I installed 1/4-in. machine bolts and threaded inserts every 6 in. along the arm. Nuts epoxied to the screw threads provide leverage for moving the arm in and out.

To rout a tapered dovetail, I clamp the guide to the panel at both ends, making sure the head of the guide is at the end of the panel where the joint will be the tightest. After making one pass with the router to cut a uniform-width dovetail slot, I turn the adjustment screws to move the flexible part of the guide arm out a bit just a quarter turn or so at the far end is usually enough. Then I make another pass with the router to produce a slot that is slightly wider at one end. To complete the joint, I cut the dovetail on the cleat in the standard way using a router table.

H. Wesley Phillips, Greer, S.C.

Fine Woodworking Magazine, October 1992 No. 96

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