It can be done but I wouldn't recommend it. If something happens, you are out a boring head. We had one guy at work that had to cut some larger holes into an aluminum panel, so he made up a trepanning cutter using a boring head. When it caught, it busted the head into pieces. It's not so much that it can't be done, but if you need a flycutter, that means you have a mill, so if you have a mill, make a flycutter. Lol!!!