When naval ship propulsion gear teeth break, the affected teeth have been“field dressed”, so that the units can be put
back into service. Then the gears are rerated to a lower rating and used reliably, at least until replacement elements
become available. Using sketches or computers, an estimate is made of the instantaneous total length of contact as the
damaged sections go through mesh and the results used as a basis of rerating the unit. Consideration is given to end
reliefs, the location of the damage on the helix and the nature of the field dressing, and actual material properties. The
results of this analysis, together with analysis of the causes of the original failure, provide limits within which the unit
can be operated with the same reliability as new.

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