Ball bearings are not commonly used in clocks. However, there is a system for applying them to clocks under certain conditions. This example shows a Herschede tubular bell movement that has had ball bearings added to the main wheels to reduce friction, increase power flow and extend the life of the main wheel bearing surfaces. The first part of the video shows the main wheels with normal brass bushings, properly sized that have been oiled. Once they are set in motion, they rotate freely for about 6 seconds. The second half of the video (I apologize for the horizontal to vertical camera flip) shows the same Herschede movement with ball bearings installed on all three main wheels. Once these are set in motion, they rotate freely for about 30 seconds, quite a difference!
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