I love building electric guitars, but the one task I never look forward to is generating the fretboard's radius. Like most small builders, I have always relied on radius sanding blocks to help do the work. The problem is, it takes at least an hour of vigorous work to get the job done. And that's for just one fretboard. If I have a stack to do, I'm in big trouble. My shoulders just can't take the work.
Over the years, I have tried a variety of jigs to help generate the radius, but none of them seemed to work very well. But then, after watching the movie "The Pit and the Pendulum," I hit upon an idea; What if I flipped the pendulum, attached the fretboard to the swinging end and ran my router along the centerline? I know that doesn't make any sense, but here are some photos of what I came up with: