Conductive Bearings?

100A ? Through a bearing? Oy Vey! Can't you use a slip ring? 100A is more than enough to give you arcing if there is any interruption and arcing is the last thing you'd want in a bearing.

Think I may have found something that will work: http://www.mercotac.com/

Thanks for the suggestion.

Most bearings are designed with clearance between the races and elements. For that reason when certain types of mechanical load is applied I believe they would ark if they were carrying significant electrical power. Also the contact points in a bearing can be pretty small so current carrying ability is a question in my mind. I can see where conductive grease would be important in a do-it-yourself application. Is there a reason why a slip ring won't work? In addition to the liquid conductor version that was mentioned, I believe they are also made with roller elements that are designed to carry electrical power.