A bronze bull gear was sent for failure investigation (Figure 1). It was used to rotate bleach washer number 65B at a rate between 4 and 5 RPM. The contacting gear was a hardened steel worm gear, which was powered by a 50 horsepower 1800 RPM electric motor.
The gear is a cast copper alloy with cut teeth and machined surface and was only in service for one month.
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