"Barry N. Turner" wrote in message
...
Platters and bowls should be uniform in thickness
throughout. Whether or not that would have prevented the warp, who knows?
Why don't you just enjoy your platter? No one but you will notice the
1/16"
warp.

Uniform thickness is another one of those "turning" things that seems to
have a life of its own. It's the species, and orientation of the annual
rings which determines both direction and magnitude of distortion. Go to the
Home Depot and take a look at those uniform thickness boards with their
wonderful cups, bows and warps for a visual on what happens as wood adjusts.

http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr118.pdf For some good
information on why.