On Tue, 31 Jan 2006 01:55:31 GMT, Mike wrote:

Barry,
Some other answers have alluded to green wood. Two comments.

Wood isn't always homogeneous, there might have been areas in the wood that
were denser (or lighter) than the rest, and when you removed enough of the
inside of the bowl the difference was enough to cause the vibrations.

The other comment, an 11" bowl does take time to turn, and we all ( I do )
need to take some time out for a 'bio break', lunch, or just sharpening the
gouge. And I have a light close to the lathe. Make sure you turn that light
OFF when you don't have the piece turning for extended periods of time (what
ever that means). The heat from the light can dry one side causing warping,
or just enough drying to cause it to loose balance. For long times (lunch)
wrap the blank with a plastic bag. This will keep some of the moisture in the
wood but it may collect in the 'lower' side of the blank.

mike

Good point, Mike... especially with the 500 watt halogen that I use... makes you
feel like an order of fries at Dennys
Mac
https://home.comcast.net/~mac.davis/wood_stuff.htm