Major Selection Criteria: Net Shape
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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...
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This design is an interchangeable stamp on a franking machine. It is coated with ink on the summit of the engraving and stamps the envelope.
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