Note: Because the effectiveness of a worm equipment drive depends on the lead angle and number of starts on the worm, the ratio ought to be kept low. To run properly, worms and worm gears operating together will need to 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 motion is transmitted to the worm wheel when the worm pinion is rotated. Since the pinion can be captivated axially, this rotation causes the worm wheel to rotate. The ratio of the worm set can be changed by changing the number of tooth on the wheel or changing the number of starts on the pinion.
When used with EP Equipment worms, EP Gear’s worm gears provide effective power transmission in applications requiring high-ratio speed reduction in a limited space using right angle (90°), nonintersecting shafts. Also, they are the smoothest, quietest kind of 
gearing when correctly applied.
Just how do Worm Gear Units 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.