"ebd" wrote in message
...
One principle I learned from the first book I ever read on turning (old
bodger name of Frank Pain) was that you can't get a catch if your cut is
above the wood. Inside, that means below the center, outside, above.

Seems to me you got this exactly backwards. Inside below center the
catch drives the tool into the wood. Same with outside above. Inside
above center a catch drives the tool into air. Same with outside
below.

Nope, Catch comes from raising the nose of the tool into wood or the wood
coming down into the nose of the tool. Keeping air over the tool keeps from
catching. Puts you at 8:45 inside, 9:15 out as optimum. The bevel on the
wood keeps you steady and away from a roll and catch.