If you follow my woodworking habits, you are well aware that I enjoy using my routers with pattern bits chucked in the collet. The piece I’m working on for the August issue requires repetitive stop cuts that are a 1/4″ wide. As far as I know, pattern bits with a 1/4″ or 1/2″ shank in 1/4″ diameters don’t exist.
If I had a pattern bit, I could clamp a straightedge at my layout line then proceed to routing the dado in just the right location. Another option is to clamp a fence at the appropriate offset to the layout line so I could run the base of the router against the fence and cut the dado where needed. Who wants to constantly measure and mark that offset?
There is a third option. I realize this jig might be old hat if you’re deep into woodworking, but if it’s a new idea, you should give it a try. I use these all the time, they are simple to make (as demonstrated below) and they are so cheap you can make a separate jig for each different bit you use.