The worm wheel, often known as the worm gear, is simplistically a helical gear that matches the pitch, pressure angle, and helix angle of the worm. The factor between a worm equipment and a helical gear is the throat. That is an indent in the tooth contact form that allows the worm to always be correctly seated with the centerline of the worm wheel. The quickness ratio of a worm equipment pair depends upon the number of teeth on the worm wheel and the amount of thread begins on the worm. For worms with an individual thread, very high-velocity ratios can be developed. Because the speed ratio may be the ratio of the number of teeth to the number of thread starts, it is possible to change the decrease ratio by exchanging the worm pair with another established which is created with additional starts. With the help of more thread begins, the helix angle must increase if the center distance is to remain the same.
There are several types of worm gear pairs. The set in depth above is known as a sole enveloping set. It is designated as such because there is only one set of threads on the worm that engage the teeth on the worm wheel. Because the worm couple is a friction travel and one set of threads repeatedly engages the worm equipment, the materials of the worm should be significantly harder than that of the wheel. For this reason, worms are typically produced from steel and worm tires are usually created from bronze alloys. It is common to harden and grind worms specifically when they are going to be used under excessive load or operating at high speeds such as inside a reduction drive gearbox.
Another type of worm gear set is the twice enveloping pair. In this arranged, the worm 
is not straight but includes a concave tooth form which complements the curvature of the worm wheel. This permits more of the threads of the worm to activate with the worm wheel. This additional contact allows for greater torque transmission.
A third type of worm equipment set is the duplex pair. This kind of worm pair runs on the single enveloping worm that includes a adjustable pitch across its length. As the pitch profile changes, the tooth contact form is elevated, and the backlash is usually decreased. Using this type of worm gear couple, a near-zero backlash worm equipment assembly could be produced
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