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bot arms that deploy cargo for shuttles and satellites, and guidance actuator systems on missiles all have gear assembly components. "Ratio range is the number of revolutions required by the pinion to rotate the gear one complete revolution. SpiroidTM gear 1-5 Source: Manufacturing Technology Research Needs of the Gear Industry, IIT Research Institute, December 1. Chapter 2 Processes and Technology Production Gears are manufactured either by machiningt gear blank or by variety of forming processes. The manufacturing process may vary according to the design characteristics of the gear produced, but the basic production method is the same. Machining gear involves cutting or grinding gear teeth. Forming gear involves processes such as precision forging, in which the gear is stamped out in press, or molding, which includes the use of powdered metals. Other forming processes include form grinding, broaching, rolling, and shearing. After the gear teeth are cut, the gear is generally hardened in heat-treating and/or quenching process. The gear surface is then finished in any one of number of surface-finishing operations. High-performance gears, because of the precision and durability required, are usually machined, whereas gears that are subject to less stress are formed. leading force for change in machining gears is end users' demand for gears with closer tolerances, greater wear resistance, and lower failure rates. This, in turn, drives manufacturers to seek computer-controlled machine tools and cutting tools that can repeatedly produce gears to extremely fine tolerances - in many cases to tolerances less than quarter of the thickness of human hair. To ensure quality, computer-controlled measuring equipment is required. Other areas that become more critical as result of machining to closer tolerances are the selection of materials, surface treatment, and precision metallurgical testing equipment Attention to such fa