Best Western Concordville Hotel and Conference Center, Concordville, Pennslyvania.  Determining the cause of a failure in a gearbox is a bit of a "whodunnit" mystery. What caused the failure? The bearings, a gear, the lubrication, or a shaft problem? Where do you start, and how can you tell? The objective of this seminar, taught by Raymond Drago, P.E. and Joseph W. Lenski, P.E., is to provide a better understanding of various types of gears and bearings and educate the designer with the limitations and capabilities of rolling element bearings and the gears that they support, so that the designer can properly apply the best gear-bearing combination to any gearbox, whether simple or complex.