Worm-Wheels EP 1002

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Description

A worm gear (or worm drive) is a specific gear composition in which a screw (worm) meshes with a gear/wheel similar to a spur gear. The set-up allows the user to determine rotational speed and also allows for higher torque to be transmitted. This mechanism can be found in devices both at home and in heavy machinery; the simplest form evident in the tuning mechanism of an acoustic guitar.

There are three different types of worm gear:

  • Non-throated – this involves a straight worm without a groove machined around the circumference. A single moving point is what provides tooth contact, meaning this particular type of worm gear is subjective to high unit load wear and tear.
  • Single-throated – concave helical teeth are wrapped around the worm for line contact, meaning higher unit loads with less excessive wear.
  • Double-throated – usually called a cone of hourglass, this type has concave teeth on both the worm screw and the gear itself. Increasing the contact area in such a way allows for increased unit loads with lower wear and tear.

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