After about 10 years on my rotary axis the motor shaft snapped. I am thinking just plain old metal fatigue because I was roughing a small piece about 1 inch diameter with a 1/8 end mill running 1/16 on each pass, no significant load. Interesting, I would have expected the bearings to fail first. Anyhoo, I am ordering a new one. Rating: [ of 5 Stars!]