Explain the significance of the quality index, Qv, for gears. How is quality index related to the manufacturing process used?

The quality index is defined by;

The quality index is the empirical variable utilized to relate the gear tolerance for the performance. The significance of the quality index is that, it recognized as imperfect but have the valuable quantity, and scatter in most evaluations of the gear performance.

There is various manufacturing process which is used to produce the gears, involving the casting, power metallurgy techniques, forging as well as machining. AGMA is defined the quality index that is related to the variations of the pitch for the gear sets. Quality index is related to the manufacturing process used to produces a gear has large effects on a quality index but it must be predictable, that have the cost which is associated by the higher gear quality. The quality index selections serves the constrain of a manufacturing choices on the behalf of the production of the gears. Each technique of manufacturing could produce the range of the quality index which is depending on the process parameters along with the control. The calculations of the quality index will be approximate but conservative. The AGMA have allowed the alternative calculations of gears quality which is connected by a transmission accuracy level Av, this method is similar to the Qv. The gear designs equations which are related with the Av and the Qv;

Av = 17-Q_v

The strength of a gear tooth, which is strongly influenced through the manufacturing process, which is used to produce the gear, contains a far reaching design impact. (Schmid & et.al, 2014)