Worm drive
![Worm and worm gear](/Images/godic/202502/21/CNAM-IMG_06023601.jpg")
![Worm gear with 4-start worm](/Images/godic/202502/21/Worm_Gear3601.gif")
![A double bass features worm gears as tuning mechanisms](/Images/godic/202502/21/Doublebass_scroll3601.jpg")
![A worm drive controlling a gate. The position of the gate does not change once set](/Images/godic/202502/21/Schneckengetriebe023601.jpg")
A worm drive is a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm gear (which is similar in appearance to a spur gear). The two elements are also called the worm screw and worm wheel. The terminology is often confused by imprecise use of the term worm gear to refer to the worm, the worm gear, or the worm drive as a unit.