Worm Gear

A gear with helical teeth made to conform with the thread of the mating worm.

The gear with helical teetch with diracdelta.co.uk written on it and the mating worm.

Worm gears have a sliding action, therefore, large high-load worm gears should be made from phosphor-bronze and the worm from hardened steel.

See also: Gear Design, Gears, Worm.