Worm drive. What is it ?. 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, and is also called a worm wheel).
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types of screws and gears
Worm drives are used in presses, in rolling mills, in conveying engineering, in mining industry machines, and on rudders. Worm gears are used on many lift (elevator) and escalator
A worm drive controlling a gate.
Worm drives are used as the tuning mechanism for many musical instruments, including guitars, mandolins , which use planetary gears. A worm drive tuning device is called a machine head.