Major Selection Criteria: Net Shape
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Ignition switch corrosion was the source of customer frustration and concern. Standard panel nuts, like the ones used to secure the ignition switch to the riding mower control panel, are made of stamped steel. The die cast company’s technical staff proposed changing...
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Zinc die casting was chosen to reduce cost of an antenna base for mobile radio equipment, which was originally a brass screw-machined part. Powder metallurgy was evaluated, but it couldn’t achieve the required undercuts without machining. Zamak 2 alloy was specified...
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A four-piece miter gear assembly utilized zinc die casting for strength and precision. Both pinion gear shafts and housing halves are die cast net-shape, achieving full functionality without a cost penalty compared to alternative designs (thermoplastic housing/gears...
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The design requirements for the assembly’s 10-in.-long housing called for non-tapered walls in the meter chamber, allowing free rotation of the metering gears and zero draft in the valve area. Previous designs utilized two aluminum castings requiring secondary...
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Field problems with a gear-driven lead screw assembly prompted the company’s engineers to re-evaluate the design. The gear drive comprised a steel screw-machined shaft and a plastic gear. Assembly required the plastic gear to be pressed onto the shaft. Failures...
