 
				Planetary Gears (Epicyclic Gears) is a gear system consisting of one or more outer gears (planet gears), revolving about a central (sun gear).
 
				
				A worm drive is a gear arrangement in which a worm (screw) meshes with a worm gear (aspur gear).
				Reduce rotational speed or transmithigher torque.
				Transfer motion in 90 degrees.
				The gear ratio is:  1 to teeth of the worm wheel
				The direction of transmission is not reversible due to the greater friction involved between the worm and worm-wheel.
				
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