Greg wrote:

No reason for the jigs, but I want to practice *turning* the end
result as well. I am assuming that segmented bowls - or worse, an
open segmented bowl - may place varying (even impact) loads on the
tool, and that a technique has to be developed to compensate for
varying wood grain, hardness, and the transition from wood to air.

When your wood is spinning at hundreds of RPM's, it's going too fast for
you to think about "the transition from wood to air"--for God sakes,
don't be so cerebral about it! :-)
Sure, the tool technique is just slightly different for interupted cuts
compared to solid wood. You are still rubbing the bevel as recommended
by all the books, videos, and websites on gouge technique, but with some
restraint on advancing the tool into the cut. If your speed is high
enough, and tool is very sharp with an appropriate grind, it will be a
piece of cake with the biggest difference from turning solid wood being
the sound of the cut.

Also, when starting out with segmented turning using different woods, it
helps to use only woods with similar working characteristics. Walnut and
cherry are perfect matches not only because of the color differences and
similar hardness, but they have very close rates of
expansion/contraction during seasonal changes in humidity so are not
likely to delaminate over time.

Ken Grunke
http://www.token.crwoodturner.com/





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