Note: Because the efficiency of a worm gear drive depends on the lead position and number of starts on the worm, the ratio ought to be kept low. To perform correctly, worms and worm gears working together must have the same diametral pitch and threads.

EP Gear provides worm gears manufactured from a number of materials, such as for example acetal, minlon, bronze, and cast iron to fit your application’s requirements.

The pinion meshes with the teeth of the worm gear at 90 degrees, and movement is transmitted to the worm wheel when the worm pinion is rotated. Because the pinion can be captivated axially, this rotation causes the worm wheel to rotate. The ratio of the worm set can be modified by changing the amount of the teeth on the wheel or changing the amount of begins on the pinion.
When used in combination with EP Gear worms, EP Gear’s worm gears provide effective power tranny in applications requiring high-ratio speed reduction in a limited space using right position (90°), nonintersecting shafts. Also, they are the smoothest, quietest form of gearing when correctly applied.

How do Worm Gear Pieces Transmit Motion?

A worm gear arranged is a set of gears comprising a worm (pinion) and a worm-wheel (worm equipment), often used when a high ratio is necessary and space is bound.

Here is a bank of info on the subject worm gear set.