Note: Because the efficiency of a worm gear drive depends upon the lead position and number of starts on the worm, the ratio should be kept low. To run correctly, worms and worm gears operating together must have the same diametral pitch and threads.
EP Gear offers worm gears produced from a variety of materials, such as acetal, minlon, bronze, and cast iron to suit your application’s requirements.
The pinion meshes with one’s teeth of the worm gear at 90 degrees, and movement is transmitted to the worm wheel when the worm pinion is rotated. Since the pinion is definitely captivated axially, this rotation causes the worm wheel to rotate. The ratio 
of the worm established can be changed by changing the amount of teeth on the wheel or changing the number of begins on the pinion.
When used in combination with EP Gear worms, EP Gear’s worm gears provide effective power transmitting in applications requiring high-ratio speed decrease in a limited space using right position (90°), nonintersecting shafts. Also, they are the smoothest, quietest kind of gearing when correctly applied.
How do Worm Gear Sets Transmit Motion?
A worm gear set is a set of gears consisting of a worm (pinion) and a worm-wheel (worm equipment), often used whenever a high ratio is necessary and space is bound.