Here's my biggest effort to date. This is one piece of cherry, 27 3/4" diameter. Submitted to Guiness, and they couldn't find a bigger one, but wouldn't list it because they said there was no category for it, and they wouldn't start one. Humpf. Turned non stop, except for two 2 hour breaks, 40 hours of constant turning. Quite grueling, but ended up with no checks or cracks, and very little warping. It was on display at Cornell for a while. Haven't found the right customer yet!