I found some Black Walnut freshly cut in 10.2018. I posted about it. I painted the end with sealer and stored in my garage. I just turned a piece from half a log. I turned the outside one day. The next evening, it had developed a nice crack. See picture below. I assumed being two years old, it should not crack. Should I have oiled it and or covered it with a plastic bag overnight. Do I need to turn it all in one day. BTW I superglued the crack
Also, I turned between centers, did the outside and made a tenon and then flipped it putting the tenon in a chuck in order to do the inside. When I did this it did not turn true. Whenever I flip something or remount it, it never turns true. Am I doing something wrong? Perhaps the wood is moving as seen by the crack?
Should I only rough the outside and make a tenon, flip it and then finish the outside before doing the inside all while held by the tenon?
Thanks for the advice,
David