I want to obtain a 3" diam core from a 6" diam x 6" long log. The thing is, I want both the core and the hole. I have looked at typical hole saws and plug/tenon cutters, but they are only 2" deep.
If this were concrete, it would be no problem, there are ample coring bits. I don't think they would work for me, since they don't reall have teeth.