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Box joints, also known as finger joints, are an effective and striking alternative to traditional dovetail joinery. Although the box joint is not mechanically interlocking like a dovetail, the joint is amazingly strong. Today's modern adhesives and the large glue surface make the box joint equally as strong as a dovetail throughout the life of the adhesive. Two sizes of box joints, 3/8" and 3/4" [9,5 and 19mm], are possible using the standard finger assembly of the D4R Pro, and the unique Leigh e-Bush provides the essential adjustment for absolutely perfect fit.
1 Use the supplied Leigh e7 guide bushing and 5/16" straight bit with your router. The guide bushing steers the router along the guide fingers.
2 All box joints are routed with the guide finger assembly in the half-blind tail mode.
3 The supplied spacer is used to space the guide fingers apart.
4 Rout around the guide fingers to form the pins.
5 The mating board is offset by the spacer positioned against the side stop.
6 Rout around the guide fingers to form the pin sockets in the mating board.
7 Fit the boards together to check the joint fit.
8 Perfect joint fit is easy with the e7 guide bushing (see diagram below).