Bandsaw (only attempt this project if you’ve been trained on this)
Router table with ½ inch dovetail router bit (only attempt this project if you’ve been trained on this)
1 2x6 board douglas fir, at least 4” long
1 2x6 board redwood, at least 4” long
I made it at Techshop: techshop.ws
I inserted the dovetail bit into the router table and adjusted the height of the bit so that it was sticking up about 3/8” above the table surface. I put the adjustable table router fence on top of the normal table saw fence.
Step 1: Making the Female Piece
I moved the fence so that there was about 1” between the top of the bit and the fence, and I noted that the exact position of the fence (on the table saw ruler which is on the front of the table saw/router table) was at 34 1/8”. I placed the douglas fir piece against the fence so that the router would cut with the grain, and I ran the wood through (making a female dovetail). I moved the fence 1/4” further away from the bit (to 33 7/8”) and ran the wood through again, widening the dovetail. I then moved the fence an additional 1 ¾” away from the bit (to 32 1/8”) and ran the wood trough again (making another female dovetail. And finally, I moved the fence another ¼” further away from the bit (to 31 7/8”) and ran the wood through again, widening the 2nd dovetail.
Step 2: Making the Male Piece
Next I removed the excess wood from the far edge of the male piece. I turned the wood around 180 degrees, moved the fence back to 35 ¼” (so that only half the bit was sticking out of the fence) and ran the wood through. Then I moved the fence ¼” away from the bit and ran the wood through again. I kept doing this (moving fence ¼” and running through) until I met up with (and thus eliminated) the 2nd female groove from the previous paragraph. At this point I had the male piece with 2 male dovetails.