homemade Wood Router - project failed And almost got me seriously injured- READ DESCR

[crazypj]

Impressive amount of bouncing around from chuck. I guess it was too far out of balance for ~ 30,000 rpm? You could probably machine whats left of the rotor and fit a mini collet chuck into it?
It would still be spinning way too fast to use anything over 1/8" ~3mm dia carbide but may work for engraving/