This gentleman that had the piece of wood bonk him in the head was ignoring several basic rules of wood turning:
1) Wasn't wearing PPE
2) Whenever you start up a wood lathe in which you've just chucked a piece of wood, stand off to the side when you turn the unit on and look, listen and FEEL the lathe with your hand to see how "wobbly" it is, and take proper steps to either remount the piece or turn it as slowly as practical.
3) He turned up the RPM on an unbalance piece of wood while in the path of destruction... you need to start at slower speeds, and once you've achieved a relatively balanced cylinder, THEN you might get away with more RPM.
I'm sure there's other basic rules I've missed, but these are what were obvious to me. Spinning gyros, especially when out of round and heavy, are a force to be reckoned with.
Jim, I went to your link on the face shield. As good a quality piece of PPE that shield is, I sure wouldn't want to get hit in the head with the force that this fellow was struck with... I wouldn't want to get that kind of impact even wearing a motorcycle helmet!

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