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Discusses the use of polymers in plastic gears for automobiles, office equipment and power tools. Factors that prompted engineers to consider the use of plastic materials; Information on the two-shot molding method used to reduce gear noise in machines; Issues to consider in selecting plastic gears. INSET: Testing gears and gear materials.

Deals with the molding of plastic gears. Most common problem in tooling for high-precision gears; Tolerances needed for precision gears; Advanced molding methods being explored to improve plastic gear fabrication. INSET: Why Plastic In Gears?.

Describes the use of a sensor-based system to measure hot and wet emissions in natural-gas pipelines in the United States. Components and features of the hybrid system; Sensor technology; Analyzer design; Performance testing.