Material used for helical gear ranges from all types of steel, stainless, cast iron, bronze, plastic, phenolic, etc. There are different types of helical gears such as cross helical gear, double helical gear and herringbone gears. The important measurements that should be considered while selecting helical gears are number of teeth, pitch diameter, outside diameter, center distance are all factors in its performance and effectiveness. These types of gear need a pair of gears that is right-hand with one left-hand helical gear. It provides a stronger, smoother and quieter operation because of its successive teeth coming in to action and it transfers load uniform and gradual. While meshing these angled teeth creates a thrust load on the gears, the teeth of the helical gear are curved along the helical path and these gear engages more gradually than the spur gear. Helical gear is a cylindrical gear wheel having the tooth form generated on a helical path about the axis of the wheel.
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