I would like to start by thanking all for the advice on coring. I cored a large maple blank and got 3 bowls 17,13,and 8 inch. I can see how more can be done, but on my first attempt I was very cautious. I checked where I was in the blank often not to make a funnel. It took me nearly 6 hours to go out back get a log cut it round on the band saw (had to change the bandsaw blade) mount it turn it round cut a tennon.Mount it in the chuck core and rough shape the big bowl. Remount and core two additional bowls. I rough shaped those also and anchorseald eveything. I think an additional chuck would have been nice. It was not that difficult once I made up my mind to do it. I would not start a project like this at nite after work. Now on to natural edge. I can see a real plus when I get to burls which may even be next.