If you like the look of hand-cut dovetails, but don’t have time (or patience) for all the meticulous work it takes to create them, then try this table saw method which uses a sliding dovetail sled to cut 90 percent of each joint. The jig cuts dovetails far faster than you can cut them by hand, and you can size the pins and tails and customize their spacing to suit just about any project — join drawer sides, build a box or small chest, etc.
With care and a bit of practice, you can produce large or medium sized, “furniture grade” 8° dovetails in both hard and soft woods. However, I think the jig is best for quickly cutting workmanlike joints that are serviceable for jobs like joining parts for tool chests and totes, drawers for kitchen or shop cabinets, and so on.
You can make the dovetail sled from either MDF or a high quality plywood, such as Baltic birch. Most of the jig is made from 1/2″-thick stock. As shown, this jig is capable of handling stock up to about 12″ wide (you can build a jig to handle larger work: simply increase all dimensions proportionally to build a bigger jig — just keep all the angles the same).
Making the Jig
Start by cutting out the jig base (piece 1) and a pair of 1/2″ pin fences (pieces 2) that align and support the pin boards. Bevel the inside-facing end of each pin fence at 82°. Glue and nail two triangular braces (pieces 3), cut at 45°, to the inside face of each pin fence, then attach them to the baseplate, as shown in Figure 1. Position each at an 8° slant relative to the front edge of the base.
Using a taper jig on the table saw, cut two pairs of 8° wedges out of 3/4″ stock. Glue each pair together to form the wide ramps (pieces 4) that will support the tail boards at an 8° angle. Glue and nail each ramp flush with the long edge of the base, as shown in Figure 2 (don’t drive nails in the area around the middle section of the ramps, where the table saw blade passes during use).
Butt the tail fence (piece 5) up to the inside of the ramps and fasten it in place, using three more triangular braces to keep it perpendicular to the base, as shown in Figure 3. Set the jig aside to let the glued parts dry overnight.
To guide the jig, I fastened an adjustable miter bar (piece 6) to the underside of the jig’s base with short washerhead screws, as shown in Figure 4. Center the bar and use a large try square or framing square to set it dead square to the base’s long edges. Set the finished sled’s bar into one of your table saw’s miter slots and adjust the bar so it’s free of side play, yet slides smoothly.
With a regular, not thin-kerf, blade fitted, start the saw and carefully “cut in” a registration slot on the pin fence as shown in Figure 5 on the following page. Move the bar to the other miter slot and cut in the second slot, then flip the sled around and cut in both registration slots on the tail fence side. To make the jig safer to use, glue square 2×4 exit blocks (pieces 7) to the base at the back of each slot, directly over the saw kerfs you just cut. To keep the jig from sliding beyond the point where the saw blade passes through the exit blocks, clamp a stop block into both of the saw’s miter slots.