Abstract
When unexpected losses were questioned at a paper mill, work began at the mill that led to a long-term investigation to determine the causes and incidence of a type of damage called bearing fluting. It was discovered that many paper machines have fluting and that this has caused significant down time and increased maintenance costs. Additionally, fluting was found to be associated with the use of AC or DC sectional variable speed control. This problem is not new, but the understanding of its origin, magnitude and treatment has improved over the past couple of years. A number of ways to control the problem were investigated. Bearing fluting was found to be readily controllable with proper application of shaft grounding thereby eliminating a significant source of lost operating time and associated maintenance costs.
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