I think the important thing is to use steel instead of aluminum adapters
and to be sure to secure them to the chuck or spindle.

Turn to Safety, Arch
Fortiter

http://community.webtv.net/almcc/MacsMusings

Securing them is a key point. I failed to do just that a couple days
ago and when I stopped the lathe the bowl and chuck unscrewed
themselves from the adapter I use. Nothing hurt but scary as hell when
the whole thing come flying off the lathe. Luckily it had slowed to
near stopping before it decided to go for a walk.

JD