1) Use the 7/16" bushing, Start on the left side of the jig, and keep the bushing against the left side of the finger when pushing the router in, and against the right side of the finger on the way out. (Keep the bushing against the comb at all times), and make sure that the comb is laying flat against the top of the horizontal board.
2) You will want your bit to cut a path approx 7/16" deep to start.
3) Raising the bit will make the teeth left on the vertical board smaller, lowering the bit (deeper cut) will make them larger. It will likely take a few attempts to get this right. You can only cut them once. if they are wrong, cut the board shorter and try again. Once you get it right, you might want to take a piece of scrap and put it in the jig vertically. make your cut as if you intend to use this board, and then set it aside. Use this as your depth guide to get you close next time you put the bit in the router.
4) You will have to set your stops so you can align your boards right. When the horizontal board is in place, the left edge of your board (as shown in your picture) should be centered in the groove of the comb, and the left edge of the vertical board should be centered on the finger located just to the right of the groove.once the boards are in place, adjust the stops on the jig against the left edges of both boards so you can duplicate the set-up quicker next time. After you have adjusted the left side stops, you'll need to do the same thing on the right side of the jig with the vertical board offset towards the center.
5) Once you are happy with all of the above, you may have to move the comb forward or back in the jig to adjust the depth of the joint when you put the boards together. If the grooves in the horizontal board aren't deep enough, the comb should be positioned farther in toward the body of the jig. This adjustment will be 1/2 of the distance you need. If you move the position of the comb by 1/16", it will show up as 1/8" of placement when you put the joint together. |