The cast iron hub (in yellow with a cover), underwent destructive testing by the customer. The 10 aluminum blades were attached to the hub before steel rods were shot at the impeller (left). After testing (above), the blades were destroyed, but the hub remained functional.


The casting conversion also


improved performance related to the adjustable blades on the outside of the hub. The original weldment had a flat outer edge, which created a gap between the blade base and hub when the blades were rotated. With the casting’s spherical outer surface, now the blades can rotate while


February 2015 MODERN CASTING | 43


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