Abstract
Plastic worm and worm gear failures observed during a series of experiments with different worm-gear material combinations and various lubricants in a 30:1 ratio speed reducer are reported. A qualitative analysis is presented of the different modes of failure which include (1) wear, (2) surface fatigue, (3) plastic flow, (4) scoring and (5) fracture. In general, failures observed in plastic gears were similar to those of metal gears, but because of the differences in material properties distinct failure characteristics were found for plastic worms and gears.
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