On 20/07/2010 13:55, Carl Denk wrote:
> I understand that the electrical arcing in the bearings (ball and
> roller) creates a surface defect and possibly local metallurgical
> defects that then some time later cause bearing failure. I can't recall
> the application where I became familiar with this phenomenon, but might
> have been aircraft.
>    

(This may be happening on my ageing motorbike, i.e. where the chassis 
return current is fed through the steering headrace bearings, causing 
some headlamp flicker when I brake hard!)

Would electrically conductive lubricants help the wind turbine problem? 
Is it initiated by lightning strike, or reliance on bearings for current 
conduction?

Matt
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