I've wanted to build a large fly cutter for some time now. Finally got it done. It has an almost 6 inch sweep so will do almost anything I can hold in my vice. I made it to use with either one or 2 cutters. Surprisingly enough the surface finish with a single cutter is better than with 1. There's a little bit of chatter from the interrupted cut as it passes over the big hole. Visible but I can't feel it.