What not to do when turning...
I was turning a very thin piece of box elder the other day. I had it finished except for the bottom. Once I got the bottom foot down to 1/16-1/32" thickness, the vacuum chuck sucked the bottom right out of the bowl while making a loud pop. Oooops there went the bottom foot! I later dropped it and broke the rim so it definitely wasn't meant to be!
Don't forget to leave a little extra meat when using a strong vacuum!